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<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title><![CDATA[function Blog() {};]]></title>
<link href="http://lunchub.github.io/atom.xml" rel="self"/>
<link href="http://lunchub.github.io/"/>
<updated>2013-09-26T16:37:12+09:00</updated>
<id>http://lunchub.github.io/</id>
<author>
<name><![CDATA[Daisuke Masuyama]]></name>
</author>
<generator uri="http://octopress.org/">Octopress</generator>
<entry>
<title type="html"><![CDATA[Octopressで記事の生成を高速化する方法]]></title>
<link href="http://lunchub.github.io/blog/2013/09/13/how-to-improve-generating-a-post-faster-on-octopress/"/>
<updated>2013-09-13T21:45:00+09:00</updated>
<id>http://lunchub.github.io/blog/2013/09/13/how-to-improve-generating-a-post-faster-on-octopress</id>
<content type="html"><![CDATA[<h2>Issues</h2>
<p><code>Octopress</code>で新しい記事を作成したり、既存の記事の編集の際に、<code>rake preview</code>や<code>rake generate</code>の実行に非常に時間が
かかってしまい、編集の効率が悪い。</p>
<h3>Factor</h3>
<p><code>Octopress</code>は、<code>preview</code>や<code>generate</code>の際、<code>source/_posts</code>配下にある記事を全て静的なHTMLへと再生成してしまうため。
記事の数が増えるほど、生成にかかる時間が増してしまうため。</p>
<h2>Solution</h2>
<ul>
<li><code>rake isolate[filename]</code>と、<code>rake integrate</code>を使用する</li>
</ul>
<h2>How to</h2>
<h3><code>rake isolate[filename]</code>と、<code>rake integrate</code>を使用する</h3>
<h4>rake isolate[filename]</h4>
<p><code>rake isolate[filename]</code>は、<code>filename</code>に指定したファイル名と一致しない記事ファイルを、
全て<code>source/_stash</code>に退避してくれる。これにより、<code>preview</code>や<code>generate</code>の際、生成のために参照する記事数が
圧倒的に少なくなるため、生成に要する時間が短縮される。</p>
<p>この<code>filename</code>に指定するファイル名は部分一致が可能なので、ファイル名をフルで指定する必要はない。
例えばこの記事のファイル名は<code>2013-09-13-how-to-improve-generating-a-post-faster-on-octopress.markdown</code>なので、
<code>faster-on-octopress</code>とでも指定しておけば問題ない。</p>
<h4>rake integrate</h4>
<p><code>rake integrate</code>は前述の<code>rake isolate[filename]</code>で退避したファイルを全て<code>source/_posts</code>に戻してくれる。</p>
<h2>Conclusion</h2>
<p>新規記事の作成や、記事の更新の手順は以下の通り。</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>新規記事 or 更新対象記事 のファイル名（filename）を確認する。
</span><span class='line'>↓
</span><span class='line'>rake isolate[filename]
</span><span class='line'>↓
</span><span class='line'>rake preview や rake generate を使用しながら対象記事を編集する
</span><span class='line'>↓
</span><span class='line'>rake integrate
</span><span class='line'>↓
</span><span class='line'>rake gen_deploy</span></code></pre></td></tr></table></div></figure>
<p>この方法はあくまで「新規記事の作成」と「記事の更新」を高速化するものなので、
記事の生成処理自体が早くなるわけではなく、最終的な<code>rake gen_deploy</code>は早くならないのが微妙なところ。</p>
<p>一応別の記事で解説予定の、「高速化パッチの当たったRuby」を使用することで生成速度はだいぶ改善される。</p>
<h2>Mutter</h2>
<p>記事のタイムスタンプをチェックするとかで、この回避策使わなくていいようにできないのかなあ・・<br/>
差分がなければスルーして欲しいところ。</p>
<h2>References</h2>
<p><section class="ads">
</section></p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[zshでrakeコマンドを実行するとエラーになる]]></title>
<link href="http://lunchub.github.io/blog/2013/09/13/how-to-avoid-rake-command-error-with-zsh/"/>
<updated>2013-09-13T20:18:00+09:00</updated>
<id>http://lunchub.github.io/blog/2013/09/13/how-to-avoid-rake-command-error-with-zsh</id>
<content type="html"><![CDATA[<h2>Issues</h2>
<p><code>zsh</code>で<code>rake</code>コマンドを実行すると以下のようなエラーが表示される。</p>
<figure class='code'><figcaption><span>zsh</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'><span class="nv">$ </span>rake some_task:create<span class="o">[</span>some_param<span class="o">]</span>
</span><span class='line'>zsh: no matches found: some_task:create<span class="o">[</span>some_param<span class="o">]</span>
</span></code></pre></td></tr></table></div></figure>
<h3>Factor</h3>
<p><code>zsh</code>では<code>[]</code>がワイルドカード扱いとなってしまうため。
上記の例だと次のような意味になる。</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
</pre></td><td class='code'><pre><code class='text'><span class='line'>rake some_task:creates
</span><span class='line'>rake some_task:createo
</span><span class='line'>rake some_task:createm
</span><span class='line'>rake some_task:createe
</span><span class='line'>rake some_task:create_
</span><span class='line'>rake some_task:createp
</span><span class='line'>rake some_task:createa
</span><span class='line'>rake some_task:creater
</span><span class='line'>rake some_task:createa
</span><span class='line'>rake some_task:createm
</span></code></pre></td></tr></table></div></figure>
<h2>Solution</h2>
<ul>
<li><code>[]</code>の前にバックスラッシュ<code>\</code>を置くことで回避する</li>
<li>コマンド自体をシングルクォートで囲む</li>
</ul>
<h2>How to</h2>
<h3><code>[]</code>の前にバックスラッシュ<code>\</code>を置くことで回避する</h3>
<figure class='code'><figcaption><span>zsh</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'><span class="nv">$ </span>rake some_task:create<span class="se">\[</span>some_param<span class="se">\]</span>
</span></code></pre></td></tr></table></div></figure>
<h3>コマンド自体をシングルクォートで囲む</h3>
<figure class='code'><figcaption><span>zsh</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'><span class="nv">$ </span>rake <span class="s1">'some_task:create[some_param]'</span>
</span></code></pre></td></tr></table></div></figure>
<h2>References</h2>
<p><section class="ads">
</section></p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[[Rails] モデルを登録する際に、他のモデルを同時に登録する方法]]></title>
<link href="http://lunchub.github.io/blog/2013/08/30/how-to-save-model-together-with-related-model/"/>
<updated>2013-08-30T22:47:00+09:00</updated>
<id>http://lunchub.github.io/blog/2013/08/30/how-to-save-model-together-with-related-model</id>
<content type="html"><![CDATA[<h2>Environment</h2>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>Mac OSX 10.7.5 (Lion)
</span><span class='line'>ruby 1.9.3p392 (2013-02-22 revision 39386) [x86_64-darwin11.4.2]
</span><span class='line'>Rails 3.2.13</span></code></pre></td></tr></table></div></figure>
<h2>Issues</h2>
<p>モデルAの登録を行った際に、同時にモデルBの登録も行いたい。</p>
<p>例：<br/>
モデル「Task」とモデル「Notice」がある前提で、
「Task」を追加した際に、「Notice」に「Task」が追加されたという内容を追加したい。</p>
<h2>Solution</h2>
<ul>
<li><code>ActiveRecord Callbacks</code>を使う
<ul>
<li>今回使用したのは<code>after_create</code></li>
</ul>
</li>
</ul>
<h2>How to</h2>
<h3><code>ActiveRecord Callbacks</code>を使う</h3>
<p><code>ActiveRecord</code>には豊富な<code>コールバック関数</code>が用意されていて、
モデルの<code>登録</code> <code>更新</code> <code>検証</code> <code>削除</code>（厳密にはその前後）といったタイミングにおいて実行されるようになっている。</p>
<p>そこで、<code>コールバック関数</code>に実行したい処理を登録しておくと、
適切なタイミングで、処理を実行させることができる。</p>
<p>また、実行したい処理は、複数登録することもできる。
その場合、実行順序がトリッキーな感じなので参考リンクを参照。</p>
<p>具体的には以下のコードで、「Task」を登録した際に、「Notice」に「Task」が追加されたという内容を登録できる。</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="k">class</span> <span class="nc">Task</span> <span class="o"><</span> <span class="ss">ActiveRecord</span><span class="p">:</span><span class="ss">:Base</span>
</span><span class='line'> <span class="o">.</span><span class="n">.</span><span class="o">.</span>
</span><span class='line'> <span class="n">after_create</span> <span class="ss">:create_notice</span>
</span><span class='line'>
</span><span class='line'> <span class="k">def</span> <span class="nf">create_notice</span>
</span><span class='line'> <span class="n">notice</span> <span class="o">=</span> <span class="no">Notice</span><span class="o">.</span><span class="n">new</span>
</span><span class='line'> <span class="n">notice</span><span class="o">.</span><span class="n">content</span> <span class="o">=</span> <span class="s1">'タスクを追加しました。'</span>
</span><span class='line'> <span class="n">notice</span><span class="o">.</span><span class="n">save</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<h3>Doubt</h3>
<ul>
<li><code>:dependent => :destroy</code>もこの仕組み使っているのだろうか</li>
</ul>
<h2>References</h2>
<ul>
<li><a href="http://guides.rubyonrails.org/active_record_callbacks.html">[RailsGuides] Active Record Callbacks</a></li>
<li><a href="http://techracho.bpsinc.jp/baba/2013_08_19/12657">Rails 4でcallback(before/after/around action)の実行順序おさらい</a></li>
</ul>
<p><section class="ads"></p>
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<p></section></p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[[Rails] formtasticでSELECTタグを生成する際、SELECTタグの先頭に空行を自動挿入させない方法]]></title>
<link href="http://lunchub.github.io/blog/2013/08/26/without-blank-fields-in-select-tag-on-formtastic/"/>
<updated>2013-08-26T20:12:00+09:00</updated>
<id>http://lunchub.github.io/blog/2013/08/26/without-blank-fields-in-select-tag-on-formtastic</id>
<content type="html"><![CDATA[<h2>Environment</h2>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>Mac OSX 10.7.5 (Lion)
</span><span class='line'>ruby 1.9.3p392 (2013-02-22 revision 39386) [x86_64-darwin11.4.2]
</span><span class='line'>Rails 3.2.13
</span><span class='line'>[Gems]
</span><span class='line'> formtastic (2.2.1)</span></code></pre></td></tr></table></div></figure>
<h2>Issues</h2>
<p><code>formtastic</code>を使用してSELECTタグを生成する際に、SELECTタグの先頭に空行を自動挿入させたくない。</p>
<h2>Solution</h2>
<ul>
<li><code>:include_blank</code>オプションを使う</li>
</ul>
<h2>How to</h2>
<h3><code>:include_blank</code>オプションを使う</h3>
<p>こんな感じにする。</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>= f.input :author, :as => :select, :include_blank => false</span></code></pre></td></tr></table></div></figure>
<p>これがREADMEに載っていない理由は謎。</p>
<h2>References</h2>
<p><a href="https://github.com/justinfrench/formtastic/blob/master/lib/formtastic/helpers/input_helper.rb">[GitHub] formtastic source</a></p>
<p><section class="ads"></p>
<div class="amzimg"><a href="http://www.amazon.co.jp/exec/obidos/ASIN/4774146633/lunchub-22/" rel="nofollow" target="_blank"><img src="http://ecx.images-amazon.com/images/I/51%2BUj1CI5tL._SX280_CR0,0,280,230_.jpg" alt="Ruby on Rails 3 アプリケーションプログラミング" /></a></div>
<div class="amzimg"><a href="http://www.amazon.co.jp/exec/obidos/ASIN/4797363827/lunchub-22/" rel="nofollow" target="_blank"><img src="http://ecx.images-amazon.com/images/I/51hvKPIWmdL._SX280_CR2,75,278,230_.jpg" alt="Rails3レシピブック 190の技" /></a></div>
<p></section></p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[[Rails] activeadmin上でhas_many resourcesのフォーム要素を動的に追加、削除するための機能を実装する方法]]></title>
<link href="http://lunchub.github.io/blog/2013/08/04/how-to-impletemt-add-and-remove-feature-for-has_many-resources-in-active-admin-on-rails/"/>
<updated>2013-08-04T15:17:00+09:00</updated>
<id>http://lunchub.github.io/blog/2013/08/04/how-to-impletemt-add-and-remove-feature-for-has_many-resources-in-active-admin-on-rails</id>
<content type="html"><![CDATA[<h2>Environment</h2>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>Mac OSX 10.7.5 (Lion)
</span><span class='line'>ruby 1.9.3p392 (2013-02-22 revision 39386) [x86_64-darwin11.4.2]
</span><span class='line'>Rails 3.2.13
</span><span class='line'>[Gems]
</span><span class='line'> activeadmin (0.6.0)
</span><span class='line'> formtastic (2.2.1)
</span><span class='line'> cocoon (1.2.0)</span></code></pre></td></tr></table></div></figure>
<h2>Issues</h2>
<p>activeadminで<code>has_many resources</code>のフォームに対して、動的に子モデルのフォーム要素の追加や削除を行う機能を実装したい。</p>
<h2>Solution</h2>
<p>現状確認している方法は以下の3通り。</p>
<ul>
<li>activeadminの標準機能（<code>form_builder</code>）を使う
<ul>
<li>[OK] 動的なフォーム要素の追加</li>
<li>[NG] 動的なフォーム要素の削除
<ul>
<li>動的に追加したフォーム要素にのみ、削除ボタンが現れる
<ul>
<li>既に登録済みのレコードを削除できない
<ul>
<li><strong>削除機能は自分で実装する必要がある</strong></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><code>formtastic</code>に自作のhelper関数を組み合わせて使う
<ul>
<li>[OK] 動的なフォーム要素の追加</li>
<li>[OK] 動的なフォーム要素の削除</li>
</ul>
</li>
<li><code>cocoon</code>を使う
<ul>
<li>[OK] 動的なフォーム要素の追加</li>
<li>[OK] 動的なフォーム要素の削除</li>
</ul>
</li>
</ul>
<h2>How to</h2>
<h3>モデル側の準備</h3>
<p>何れの方法で実装するにしても、親モデル側に以下の記述をして置く必要がある。</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="k">class</span> <span class="nc">Project</span> <span class="o"><</span> <span class="ss">ActiveRecord</span><span class="p">:</span><span class="ss">:Base</span>
</span><span class='line'> <span class="n">attr_accessible</span> <span class="ss">:tasks_attributes</span>
</span><span class='line'>
</span><span class='line'> <span class="n">has_many</span> <span class="ss">:tasks</span>
</span><span class='line'> <span class="n">accepts_nested_attributes_for</span> <span class="ss">:tasks</span><span class="p">,</span> <span class="ss">:reject_if</span> <span class="o">=></span> <span class="ss">:all_blank</span><span class="p">,</span> <span class="ss">:allow_destroy</span> <span class="o">=></span> <span class="kp">true</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<h4><code>:accepts_nested_attributes_for</code></h4>
<p>1つのフォームの中で、親モデルと<code>has_many</code>で関連付けられた、子モデルの同時編集を可能にするための機能。</p>
<h4><code>:reject_if</code></h4>
<p>ここで指定した条件にマッチすれば、子モデルの保存をスルーさせることができる機能。</p>
<p>ここでは<code>:all_blank</code>を指定しているので、全ての項目が未編集のままフォームが送信された場合は、
子モデルの保存が行われない。</p>
<p><code>:all_blank</code>の他に、<code>lamda</code>や<code>proc</code>、<code>privateメソッド</code>を指定することができる。</p>
<p>状況としては、動的に子モデルのフォーム要素を追加したが、やっぱりいらないやということで、
未編集のままフォームを送信した場合等に、空のデータのまま子モデルが保存されるのを防ぐことができる。</p>
<h4><code>:allow_destroy</code></h4>
<p>1つのフォームで親モデルと一緒に保存できるようになったはいいけど、削除だってしたいよという場合に使う機能。</p>
<p><code>:allow_destroy</code>を有効にすると、<code>_destroy</code>パラメータを子モデルと一緒に渡すことで、
削除してくれるようになる。</p>
<p>例えばチェックボックスに<code>project[tasks_attributes][0][_destroy]</code>といった<code>name属性</code>を割り当てて、
チェックボックスにチェックが入った状態で送信すると、tasks_attributesの0番目の要素が削除される。</p>
<h4><code>:attr_accessible</code></h4>
<p><code>:accepts_nested_attributes_for</code>を指定すると、フォームの中で子モデルの<code>name属性</code>は<code>xxx_attributes</code>（xxxは子モデルの名前）という形で自動的に割り振られる。</p>
<p>しかし、せっかく割り振られた<code>name属性</code>にアクセスできないと、値の変更を行うことができないため、
予め<code>:attr_accessible</code>にキーを設定しておく。</p>
<h3>activeadminの標準機能（<code>form_builder</code>）を使う</h3>
<p><code>activeadmin</code>にも標準で動的に要素を追加する機能が備わっている。
しかし、動的に削除する機能は、動的に追加した要素にのみ表示されるようになっており、
一度保存したデータに対しては削除機能は提供されないので、
その部分は自分で実装する必要がある。</p>
<p>この削除機能のやっつけ感が否めない・・・
空データの登録をさせないにも中途半端だし、そもそもそれなら<code>:reject_if</code>があるし・・</p>
<p>ということで、削除機能（チェックボックス）付きの実装は以下の通り。</p>
<figure class='code'><figcaption><span>app/admin/projects.rb</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">activeadmin</span><span class="o">.</span><span class="n">register</span> <span class="no">Project</span> <span class="k">do</span>
</span><span class='line'> <span class="n">form</span> <span class="k">do</span> <span class="o">|</span><span class="n">f</span><span class="o">|</span>
</span><span class='line'> <span class="n">f</span><span class="o">.</span><span class="n">has_many</span> <span class="ss">:tasks</span> <span class="k">do</span> <span class="o">|</span><span class="n">att</span><span class="o">|</span>
</span><span class='line'> <span class="n">att</span><span class="o">.</span><span class="n">input</span> <span class="ss">:_destroy</span><span class="p">,</span> <span class="ss">:as</span> <span class="o">=></span> <span class="ss">:boolean</span><span class="p">,</span> <span class="ss">:label</span> <span class="o">=></span> <span class="s2">"Destroy?"</span>
</span><span class='line'> <span class="n">att</span><span class="o">.</span><span class="n">input</span> <span class="ss">:task</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'>
</span><span class='line'> <span class="n">f</span><span class="o">.</span><span class="n">actions</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<p>この実装だと動的にフォーム要素は消えないので、そこは<code>jQuery</code>なりでゴリゴリ実装する必要がある。
この後紹介するRailsCastsのヘルパー関数を自作して埋め込むのも有りだと思う。</p>
<h4>activeadminの実装を見てみる</h4>
<p>子モデルの1レコードずつ、フォーム要素を構築する処理の中で、<code>has_many_form.object.new_record?</code>の場合のみ、
削除用のJSが仕込まれていることがわかる。やっている内容は当該レコードをラップしているHTMLを<code>remove()</code>するだけ。</p>
<p>動的にフォーム要素を追加するJSを、<code>js_for_has_many</code>から呼び出して、バッファの最後に追加していることがわかる。</p>
<p>これってレコード毎に削除用フラグを管理する<code>hidden</code>タグを埋め込んでおいて、
削除用JSにフラグの<code>value</code>を<code>true</code>にする処理追加すればいいんじゃないのかなぁ・・</p>
<figure class='code'><figcaption><span>vendor/bundle/ruby/1.9.1/gems/activeadmin-0.6.0/lib/active_admin/form_builder.rb#L.44, L.172</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
<span class='line-number'>18</span>
<span class='line-number'>19</span>
<span class='line-number'>20</span>
<span class='line-number'>21</span>
<span class='line-number'>22</span>
<span class='line-number'>23</span>
<span class='line-number'>24</span>
<span class='line-number'>25</span>
<span class='line-number'>26</span>
<span class='line-number'>27</span>
<span class='line-number'>28</span>
<span class='line-number'>29</span>
<span class='line-number'>30</span>
<span class='line-number'>31</span>
<span class='line-number'>32</span>
<span class='line-number'>33</span>
<span class='line-number'>34</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="k">def</span> <span class="nf">has_many</span><span class="p">(</span><span class="n">association</span><span class="p">,</span> <span class="n">options</span> <span class="o">=</span> <span class="p">{},</span> <span class="o">&</span><span class="n">block</span><span class="p">)</span>
</span><span class='line'> <span class="o">.</span><span class="n">.</span><span class="o">.</span>
</span><span class='line'>
</span><span class='line'> <span class="c1"># Add Delete Links</span>
</span><span class='line'> <span class="n">form_block</span> <span class="o">=</span> <span class="nb">proc</span> <span class="k">do</span> <span class="o">|</span><span class="n">has_many_form</span><span class="o">|</span>
</span><span class='line'> <span class="o">.</span><span class="n">.</span><span class="o">.</span>
</span><span class='line'>
</span><span class='line'> <span class="k">if</span> <span class="n">has_many_form</span><span class="o">.</span><span class="n">object</span><span class="o">.</span><span class="n">new_record?</span>
</span><span class='line'> <span class="n">contents</span> <span class="o">+=</span> <span class="n">template</span><span class="o">.</span><span class="n">content_tag</span><span class="p">(</span><span class="ss">:li</span><span class="p">)</span> <span class="k">do</span>
</span><span class='line'> <span class="n">template</span><span class="o">.</span><span class="n">link_to</span> <span class="no">I18n</span><span class="o">.</span><span class="n">t</span><span class="p">(</span><span class="s1">'active_admin.has_many_delete'</span><span class="p">),</span> <span class="s2">"#"</span><span class="p">,</span> <span class="ss">:onclick</span> <span class="o">=></span> <span class="s2">"$(this).closest('.has_many_fields').remove(); return false;"</span><span class="p">,</span> <span class="ss">:class</span> <span class="o">=></span> <span class="s2">"button"</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'>
</span><span class='line'> <span class="o">.</span><span class="n">.</span><span class="o">.</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'>
</span><span class='line'> <span class="n">form_buffers</span><span class="o">.</span><span class="n">last</span> <span class="o"><<</span> <span class="n">with_new_form_buffer</span> <span class="k">do</span>
</span><span class='line'> <span class="n">template</span><span class="o">.</span><span class="n">content_tag</span> <span class="ss">:div</span><span class="p">,</span> <span class="ss">:class</span> <span class="o">=></span> <span class="s2">"has_many </span><span class="si">#{</span><span class="n">association</span><span class="si">}</span><span class="s2">"</span> <span class="k">do</span>
</span><span class='line'> <span class="o">.</span><span class="n">.</span><span class="o">.</span>
</span><span class='line'>
</span><span class='line'> <span class="n">form_buffers</span><span class="o">.</span><span class="n">last</span> <span class="o"><<</span> <span class="n">js_for_has_many</span><span class="p">(</span><span class="n">association</span><span class="p">,</span> <span class="n">form_block</span><span class="p">,</span> <span class="n">template</span><span class="p">)</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'><span class="k">end</span>
</span><span class='line'>
</span><span class='line'><span class="c1"># Capture the ADD JS</span>
</span><span class='line'><span class="k">def</span> <span class="nf">js_for_has_many</span><span class="p">(</span><span class="n">association</span><span class="p">,</span> <span class="n">form_block</span><span class="p">,</span> <span class="n">template</span><span class="p">)</span>
</span><span class='line'> <span class="o">.</span><span class="n">.</span><span class="o">.</span>
</span><span class='line'>
</span><span class='line'> <span class="n">onclick</span> <span class="o">=</span> <span class="s2">"$(this).before('</span><span class="si">#{</span><span class="n">js</span><span class="si">}</span><span class="s2">'.replace(/</span><span class="si">#{</span><span class="n">placeholder</span><span class="si">}</span><span class="s2">/g, new Date().getTime())); return false;"</span>
</span><span class='line'> <span class="n">text</span> <span class="o">=</span> <span class="no">I18n</span><span class="o">.</span><span class="n">t</span> <span class="s1">'active_admin.has_many_new'</span><span class="p">,</span> <span class="ss">:model</span> <span class="o">=></span> <span class="n">assoc_name</span><span class="o">.</span><span class="n">human</span>
</span><span class='line'>
</span><span class='line'> <span class="n">template</span><span class="o">.</span><span class="n">link_to</span><span class="p">(</span><span class="n">text</span><span class="p">,</span> <span class="s2">"#"</span><span class="p">,</span> <span class="ss">:onclick</span> <span class="o">=></span> <span class="n">onclick</span><span class="p">,</span> <span class="ss">:class</span> <span class="o">=></span> <span class="s2">"button"</span><span class="p">)</span><span class="o">.</span><span class="n">html_safe</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<h3><code>formtastic</code>に自作のhelper関数を組み合わせて使う</h3>
<p>helper関数の作成はRailsCastsと同じもので大丈夫なので、記事下部の<code>References</code>を参照してください。</p>
<p>後述の<code>cocoon</code>との違いは関数名の違いだけなので、ソースは省略します。</p>
<h3><code>cocoon</code>を使う</h3>
<p><code>cocoon</code>は、<code>Railsのデフォルトのフォームビルダー</code>, <code>formtastic</code>, <code>simpleform</code>に対応しています。
前述の自作ヘルパー関数と比べて、<code>gem</code>をインストールするだけで使えるので簡単です。</p>
<p><a href="http://lunchub.github.io/blog/2013/08/01/hamari-on-starting-to-use-cocoon-gem/">cocoon導入の際ハマった内容も記事</a>にしてあるので、よければ参考にしてください。</p>
<p><code>cocoon</code>を使った実装は以下の通り。</p>
<figure class='code'><figcaption><span>app/views/admin/projects/_form.html.haml</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="o">=</span> <span class="n">semantic_form_for</span> <span class="o">[</span><span class="ss">:admin</span><span class="p">,</span> <span class="vi">@work</span><span class="o">]</span> <span class="k">do</span> <span class="o">|</span><span class="n">f</span><span class="o">|</span>
</span><span class='line'> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">inputs</span> <span class="s2">""</span> <span class="k">do</span>
</span><span class='line'>
</span><span class='line'> <span class="o">.</span><span class="n">tasks_fields</span>
</span><span class='line'> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">semantic_fields_for</span> <span class="ss">:tasks</span> <span class="k">do</span> <span class="o">|</span><span class="n">task</span><span class="o">|</span>
</span><span class='line'> <span class="o">=</span> <span class="n">render</span> <span class="s1">'task_fields'</span><span class="p">,</span> <span class="ss">:f</span> <span class="o">=></span> <span class="n">task</span>
</span><span class='line'> <span class="o">.</span><span class="n">links</span>
</span><span class='line'> <span class="o">=</span> <span class="n">link_to_add_association</span> <span class="s1">'add task'</span><span class="p">,</span> <span class="n">f</span><span class="p">,</span> <span class="ss">:tasks</span>
</span><span class='line'>
</span><span class='line'> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">actions</span> <span class="k">do</span>
</span><span class='line'> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">action</span> <span class="ss">:submit</span>
</span></code></pre></td></tr></table></div></figure>
<figure class='code'><figcaption><span>app/views/admin/projects/_task_fields.html.haml</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="o">.</span><span class="n">nested</span><span class="o">-</span><span class="n">fields</span>
</span><span class='line'> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">inputs</span> <span class="k">do</span>
</span><span class='line'> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">input</span> <span class="ss">:task</span>
</span><span class='line'> <span class="o">=</span> <span class="n">link_to_remove_association</span> <span class="s2">"remove task"</span><span class="p">,</span> <span class="n">f</span>
</span></code></pre></td></tr></table></div></figure>
<p><code>cocoon</code>を導入すると、<code>link_to_add_association</code>と<code>link_to_remove_association</code>関数が使えるようになります。
<code>formtastic</code> + 自作ヘルパー関数との違いは関数名だけで、引数の使い方も全く同じです。
<code>link_to_add_association</code>が<code>link_to_add_fields</code>に、
<code>link_to_remove_association</code>が<code>link_to_remove_fields</code>に対応しています。</p>
<p><code>cocoon</code>自体がRailsCastsの内容を参考にしているのでしょうね。</p>
<h2>Conclusion</h2>
<p>今のところ3番目の<code>cocoon</code>を使った実装が一番簡単じゃないかなーと思います。
<code>activeadmin</code>は<code>has_many</code>を呼ぶと勝手に、動的なフォーム要素の追加ボタンを差しこんでくれるけど、
削除機能はイマイチ君・・・</p>
<p><code>activeadmin</code>だけで完結するようになれば良いのだけど・・・</p>
<h2>References</h2>
<ul>
<li><a href="http://guides.rubyonrails.org/form_helpers.html#building-complex-forms">[RailsGuides] Building Complex Forms</a></li>
<li><a href="http://railscasts.com/episodes/196-nested-model-form-part-1">[RailsCasts] Nested Model Form Part 1</a></li>
<li><a href="http://railscasts.com/episodes/197-nested-model-form-part-2">[RailsCasts] Nested Model Form Part 2</a></li>
<li><a href="http://kray.jp/blog/has-many-through-nested-object-forms/">[Rails] Nested Object Forms を使って多対多の関係をスマートに編集 </a></li>
<li><a href="http://o.inchiki.jp/obbr/81">Railsでネストしたモデルをまとめて受け取って保存する</a></li>
<li><a href="https://github.com/nathanvda/cocoon">[GitHub] cocoon</a></li>
</ul>
<p><section class="ads"></p>
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<p></section></p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[[Rails] ActiveAdmin + cocoon を使い始めた際にハマったこと]]></title>
<link href="http://lunchub.github.io/blog/2013/08/01/hamari-on-starting-to-use-cocoon-gem/"/>
<updated>2013-08-01T21:25:00+09:00</updated>
<id>http://lunchub.github.io/blog/2013/08/01/hamari-on-starting-to-use-cocoon-gem</id>
<content type="html"><![CDATA[<h2>Environment</h2>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>Mac OSX 10.7.5 (Lion)
</span><span class='line'>ruby 1.9.3p392 (2013-02-22 revision 39386) [x86_64-darwin11.4.2]
</span><span class='line'>Rails 3.2.13
</span><span class='line'>[Gems]
</span><span class='line'> activeadmin (0.6.0)
</span><span class='line'> formtastic (2.2.1)
</span><span class='line'> cocoon (1.2.0)</span></code></pre></td></tr></table></div></figure>
<h2>Issues</h2>
<ul>
<li><p><code>Missing partial</code> エラー</p></li>
<li><p><code>undefined local variable or method</code> エラー</p></li>
<li><p><code>link_to_add_association</code>の永久ループ</p></li>
<li><p>show画面やedit画面にアップロードした画像を表示させたい</p>
<ul>
<li>アップロードできても確認ができないとねえ・・</li>
<li>これは<code>cocoon</code>というより<code>formtastic</code>の使い方の問題かな</li>
</ul>
</li>
</ul>
<h2>Solution & How to</h2>
<h3>Missing partial エラー</h3>
<h4>partialに分割する必要がある</h4>
<p><code>render_association</code>で呼び出すため。</p>
<p><code>link_to_add_association -> render_association</code></p>
<figure class='code'><figcaption><span>vendor/bundle/ruby/1.9.1/gems/cocoon-1.2.0/lib/cocoon/view_helpers.rb#L.34</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="k">def</span> <span class="nf">render_association</span><span class="p">(</span><span class="n">association</span><span class="p">,</span> <span class="n">f</span><span class="p">,</span> <span class="n">new_object</span><span class="p">,</span> <span class="n">render_options</span><span class="o">=</span><span class="p">{},</span> <span class="n">custom_partial</span><span class="o">=</span><span class="kp">nil</span><span class="p">)</span>
</span><span class='line'> <span class="n">partial</span> <span class="o">=</span> <span class="n">get_partial_path</span><span class="p">(</span><span class="n">custom_partial</span><span class="p">,</span> <span class="n">association</span><span class="p">)</span>
</span><span class='line'> <span class="o">.</span><span class="n">.</span><span class="o">.</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<h4>partialの名前に注意（単数形であること）</h4>
<p><code>get_partial_path</code>が単数系を期待しているため。</p>
<p><code>link_to_add_association -> render_association -> get_partial_path</code></p>
<figure class='code'><figcaption><span>vendor/bundle/ruby/1.9.1/gems/cocoon-1.2.0/lib/cocoon/view_helpers.rb#L.98</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="k">def</span> <span class="nf">get_partial_path</span><span class="p">(</span><span class="n">partial</span><span class="p">,</span> <span class="n">association</span><span class="p">)</span>
</span><span class='line'> <span class="n">partial</span> <span class="p">?</span> <span class="n">partial</span> <span class="p">:</span> <span class="n">association</span><span class="o">.</span><span class="n">to_s</span><span class="o">.</span><span class="n">singularize</span> <span class="o">+</span> <span class="s2">"_fields"</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<h3>undefined local variable or method エラー</h3>
<p><code>link_to_add_association</code>と同じパーシャルを使うので、<code>link_to_add_association</code>の引数と同じ名前のローカル変数を割り当てなくてはいけない。</p>
<p>当然パーシャル側の変数も合わせる。</p>
<figure class='code'><figcaption><span>_form.html.haml</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class='haml'><span class='line'><span class="nc">.attachments_fields</span>
</span><span class='line'> <span class="p">=</span> <span class="n">f</span><span class="o">.</span><span class="n">semantic_fields_for</span> <span class="ss">:attachments</span> <span class="k">do</span> <span class="o">|</span><span class="n">att</span><span class="o">|</span>
</span><span class='line'> <span class="p">=</span> <span class="n">render</span> <span class="s1">'attachment_fields'</span><span class="p">,</span> <span class="ss">:f</span> <span class="o">=></span> <span class="n">att</span> <span class="c1"># attを f に割り当てる</span>
</span><span class='line'> <span class="nc">.links</span>
</span><span class='line'> <span class="p">=</span> <span class="n">link_to_add_association</span> <span class="s1">'add image'</span><span class="p">,</span> <span class="n">f</span><span class="p">,</span> <span class="ss">:attachments</span> <span class="c1"># f を割り当てる</span>
</span></code></pre></td></tr></table></div></figure>
<figure class='code'><figcaption><span>_attachment_fields.html.haml</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
</pre></td><td class='code'><pre><code class='haml'><span class='line'><span class="nc">.nested-fields</span>
</span><span class='line'> <span class="p">=</span> <span class="n">f</span><span class="o">.</span><span class="n">inputs</span> <span class="k">do</span> <span class="c1"># f に固定する</span>
</span><span class='line'> <span class="p">=</span> <span class="n">f</span><span class="o">.</span><span class="n">input</span> <span class="ss">:attachment</span><span class="p">,</span> <span class="ss">as</span><span class="p">:</span> <span class="ss">:file</span>
</span><span class='line'> <span class="p">=</span> <span class="n">link_to_remove_association</span> <span class="s2">"remove image"</span><span class="p">,</span> <span class="n">f</span>
</span></code></pre></td></tr></table></div></figure>
<h3>link_to_add_associationの永久ループ</h3>
<p><code>link_to_add_association</code>の置き場所がまずかった。</p>
<p><code>f.semantic_fields_for</code>と同じ階層にいなくてはいけない。</p>
<figure class='code'><figcaption><span>NG pattern</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
</pre></td><td class='code'><pre><code class='haml'><span class='line'> <span class="p">=</span> <span class="n">f</span><span class="o">.</span><span class="n">semantic_fields_for</span> <span class="ss">:attachments</span> <span class="k">do</span> <span class="o">|</span><span class="n">att</span><span class="o">|</span>
</span><span class='line'> <span class="p">=</span> <span class="n">render</span> <span class="s1">'attachment_fields'</span><span class="p">,</span> <span class="ss">:f</span> <span class="o">=></span> <span class="n">att</span>
</span><span class='line'> <span class="nc">.links</span>
</span><span class='line'> <span class="p">=</span> <span class="n">link_to_add_association</span> <span class="s1">'add image'</span><span class="p">,</span> <span class="n">f</span><span class="p">,</span> <span class="ss">:attachments</span>
</span></code></pre></td></tr></table></div></figure>
<figure class='code'><figcaption><span>OK pattern</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
</pre></td><td class='code'><pre><code class='haml'><span class='line'> <span class="p">=</span> <span class="n">f</span><span class="o">.</span><span class="n">semantic_fields_for</span> <span class="ss">:attachments</span> <span class="k">do</span> <span class="o">|</span><span class="n">att</span><span class="o">|</span>
</span><span class='line'> <span class="p">=</span> <span class="n">render</span> <span class="s1">'attachment_fields'</span><span class="p">,</span> <span class="ss">:f</span> <span class="o">=></span> <span class="n">att</span>
</span><span class='line'> <span class="nc">.links</span>
</span><span class='line'> <span class="p">=</span> <span class="n">link_to_add_association</span> <span class="s1">'add image'</span><span class="p">,</span> <span class="n">f</span><span class="p">,</span> <span class="ss">:attachments</span>
</span></code></pre></td></tr></table></div></figure>
<h3>show画面やedit画面にアップロードした画像を表示させたい</h3>
<h4>show画面の場合</h4>
<p><code>image_tag</code>を使った。</p>
<figure class='code'><figcaption><span>app/admin/works.rb</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="no">ActiveAdmin</span><span class="o">.</span><span class="n">register</span> <span class="no">Work</span> <span class="k">do</span>
</span><span class='line'> <span class="n">show</span> <span class="k">do</span> <span class="o">|</span><span class="n">work</span><span class="o">|</span>
</span><span class='line'> <span class="n">div</span> <span class="n">work</span><span class="o">.</span><span class="n">title</span>
</span><span class='line'> <span class="n">work</span><span class="o">.</span><span class="n">attachments</span><span class="o">.</span><span class="n">each</span> <span class="k">do</span> <span class="o">|</span><span class="n">att</span><span class="o">|</span>
</span><span class='line'> <span class="n">div</span> <span class="n">image_tag</span> <span class="n">att</span><span class="o">.</span><span class="n">attachment_url</span><span class="o">.</span><span class="n">to_s</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'> <span class="o">.</span><span class="n">.</span><span class="o">.</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<h4>edit画面の場合</h4>
<p><code>formtastic</code>の領域なので、<code>template_tag</code>を使った。</p>
<figure class='code'><figcaption><span>app/views/admin/works/_attachment_fields.html.haml</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
</pre></td><td class='code'><pre><code class='haml'><span class='line'> <span class="p">=</span> <span class="n">f</span><span class="o">.</span><span class="n">inputs</span> <span class="k">do</span>
</span><span class='line'> <span class="p">=</span> <span class="n">f</span><span class="o">.</span><span class="n">input</span> <span class="ss">:attachment</span><span class="p">,</span> <span class="ss">as</span><span class="p">:</span> <span class="ss">:file</span>
</span><span class='line'> <span class="p">=</span> <span class="n">f</span><span class="o">.</span><span class="n">template</span><span class="o">.</span><span class="n">image_tag</span> <span class="n">f</span><span class="o">.</span><span class="n">object</span><span class="o">.</span><span class="n">attachment_url</span><span class="o">.</span><span class="n">presence</span> <span class="o">||</span> <span class="kp">nil</span>
</span><span class='line'> <span class="p">=</span> <span class="n">link_to_remove_association</span> <span class="s2">"remove image"</span><span class="p">,</span> <span class="n">f</span>
</span></code></pre></td></tr></table></div></figure>
<h2>Mutter</h2>
<p>なんか・・<code>link_to_add_association</code>に依存しすぎな気がする・・</p>
<h2>References</h2>
<ul>
<li><a href="https://github.com/nathanvda/cocoon">[GitHub] cocoon</a></li>
</ul>
<p><section class="ads"></p>
<div class="amzimg"><a href="http://www.amazon.co.jp/exec/obidos/ASIN/4774146633/lunchub-22/" rel="nofollow" target="_blank"><img src="http://ecx.images-amazon.com/images/I/51%2BUj1CI5tL._SX280_CR0,0,280,230_.jpg" alt="Ruby on Rails 3 アプリケーションプログラミング" /></a></div>
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<p></section></p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[Amazon S3のバケット名に"."ドットを含めるとハマる]]></title>
<link href="http://lunchub.github.io/blog/2013/07/29/hamari-on-s3-bucket-name-with-dots/"/>
<updated>2013-07-29T17:05:00+09:00</updated>
<id>http://lunchub.github.io/blog/2013/07/29/hamari-on-s3-bucket-name-with-dots</id>
<content type="html"><![CDATA[<h2>Precondition</h2>
<ul>
<li><a href="http://lunchub.github.io/blog/2013/07/14/how-to-use-carrierwave-with-amazon-s3/">CarrierWaveでアップロード先をAmazon S3に設定する方法</a></li>
<li><a href="http://lunchub.github.io/blog/2013/07/14/hamari-on-carrierwave-with-amazon-s3/">CarrierWaveからAmazon S3に画像アップロードできない</a></li>
</ul>
<h2>Issues</h2>
<p><code>carrierwave</code> + <code>fog</code>で<code>Amazon S3</code>に画像をアップロードできようになったのはいいものの、<br/>
いざ画面に<code>Amazon S3</code>上の画像を表示させようとすると、<br/>
画像が表示されない。</p>
<h3>Factor</h3>
<p>バケット名にドット<code>.</code>が含まれていることで、SSLエラーが発生している。<br/>
<code>Amazon S3</code>のSSL証明書がワイルドカード<code>*.s3-ap-northeast-1.amazonaws.com</code>だから。<br/>
これはレベル3ドメインまでの範囲で、ワイルドカードを使っていいよということなので、<br/>
<code>mysite.com.s3-ap-northeast-1.amazonaws.com</code>みたいなことは出来ませんよということ。</p>
<p><code>サイトドメイン＝バケット名</code>にすればわかりやすいじゃん！<br/>
と思っていたらとんでも設定で痛い目に合いました。</p>
<h2>Solution</h2>
<p>バケット名にドット<code>.</code>を含めない。</p>
<h2>References</h2>
<ul>
<li><a href="https://github.com/carrierwaveuploader/carrierwave/issues/667">[GitHub] SSL Error when access Amazon S3</a></li>
<li><a href="http://blog.dateofrock.com/2012/02/s3.html">S3のバケット名はよく考えて命名しましょう！</a></li>
</ul>
<p><section class="ads">
</section></p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[[Rails] inherited_resourcesによって変更された，scaffoldの挙動を元に戻す方法]]></title>
<link href="http://lunchub.github.io/blog/2013/07/29/how-to-disable-the-scaffold-behavior-that-has-changed-by-inherited_resources/"/>
<updated>2013-07-29T11:41:00+09:00</updated>
<id>http://lunchub.github.io/blog/2013/07/29/how-to-disable-the-scaffold-behavior-that-has-changed-by-inherited_resources</id>
<content type="html"><![CDATA[<h2>Environment</h2>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
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</pre></td><td class='code'><pre><code class=''><span class='line'>Mac OSX 10.7.5 (Lion)
</span><span class='line'>ruby 1.9.3p392 (2013-02-22 revision 39386) [x86_64-darwin11.4.2]
</span><span class='line'>Rails 3.2.13
</span><span class='line'>[Gems]
</span><span class='line'> activeadmin (0.6.0)
</span><span class='line'> inherited_resources (1.4.0)</span></code></pre></td></tr></table></div></figure>
<h2>Issues</h2>
<p><code>active_admin</code>をインストールした後から，<code>scaffold</code>や<code>rails g controller</code>を実行すると，必ず自動生成されたコントローラが，<code>InheritedResources</code>を継承した状態になっている．
<code>inherited_resources</code>を使いたくない場面もあるので，デフォルトでこの状態になるのは好ましくない．</p>
<h3>Factor</h3>
<ul>
<li><code>active_admin</code>をインストールすると，<code>inherited_resources</code>もインストールされる．</li>
<li><code>inherited_resources</code>がデフォルトの<code>scaffold</code>の挙動を書き換える</li>
</ul>
<p>以下の<code>config.app_generators</code>の部分で，<code>:inherited_resources_controller</code>を設定している．</p>
<figure class='code'><figcaption><span>vendor/bundle/ruby/1.9.1/gems/inherited_resources-1.4.0/lib/inherited_resources.rb#L25</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
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</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="k">class</span> <span class="nc">Railtie</span> <span class="o"><</span> <span class="o">::</span><span class="ss">Rails</span><span class="p">:</span><span class="ss">:Engine</span>
</span><span class='line'> <span class="n">config</span><span class="o">.</span><span class="n">inherited_resources</span> <span class="o">=</span> <span class="no">InheritedResources</span>
</span><span class='line'> <span class="k">if</span> <span class="n">config</span><span class="o">.</span><span class="n">respond_to?</span><span class="p">(</span><span class="ss">:app_generators</span><span class="p">)</span>
</span><span class='line'> <span class="n">config</span><span class="o">.</span><span class="n">app_generators</span><span class="o">.</span><span class="n">scaffold_controller</span> <span class="o">=</span> <span class="ss">:inherited_resources_controller</span>
</span><span class='line'> <span class="k">else</span>
</span><span class='line'> <span class="n">config</span><span class="o">.</span><span class="n">generators</span><span class="o">.</span><span class="n">scaffold_controller</span> <span class="o">=</span> <span class="ss">:inherited_resources_controller</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<h2>Solution</h2>
<ul>
<li><code>config/application.rb</code>にコードを追加する</li>
</ul>
<h2>How to</h2>
<p><code>cofig/application.rb</code>に以下のコードを追加する</p>
<figure class='code'><figcaption><span>config/application.rb</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
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</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="k">class</span> <span class="nc">Application</span> <span class="o"><</span> <span class="ss">Rails</span><span class="p">:</span><span class="ss">:Application</span>
</span><span class='line'> <span class="n">config</span><span class="o">.</span><span class="n">app_generators</span><span class="o">.</span><span class="n">scaffold_controller</span> <span class="o">=</span> <span class="ss">:scaffold_controller</span> <span class="c1"># 追加</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<p><code>:scaffold_controller</code>の元ネタはどこだよということで探してみると，<br/>
<code>vendor/bundle/ruby/1.9.1/gems/railties-3.2.11/lib/rails/generators.rb</code>で見つかった．</p>
<figure class='code'><figcaption><span>vendor/bundle/ruby/1.9.1/gems/railties-3.2.11/lib/rails/generators.rb#L50</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
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