Fix range options forgetting its initial fixed range if group is smaller

[joelekstrom]

Problem:

When I for example I want to display a maximum of two items in a specific group and do this:

[mappings setRangeOptions:[YapDatabaseViewRangeOptions fixedRangeWithLength:2 offset:0 from:YapDatabaseViewBeginning] forGroup:@"group"]

there will be a bug if the group contains < N items when this call is made. Internally, YapDatabase sets the length of the range options to MIN(length, objectCount), and then forgets about this value.

This is a problem when the view and mappings are created first, and then data comes in from a network request to populate the groups. The range options will forever be 0 in length.

If this was intended, I'd love to understand why!

Solution

Never overwrite the maxLength of fixed range options