createOrUpdateSubscriber throws error when group was assigned via sdk

[chrisspiegl]

Just tested the MailerLite SDK and there appears to be some inconsistencies with the API & SDK about the groups field on the user object.

1. I get a subscriber via mailerlite.subscribers.find(email)
2. then add the subscriber to a group via mailerlite.groups.assignSubscriber(subscriberId, groupId) (groupId is REQUIRED to be provided as a string)

The next time I get the user and try to update it via createOrUpdate, error throws:

1. I get a subscriber via res = mailerlite.subscribers.find(email)
2. Change something in the fields: res.data.data.fields.name = "fluff"
3. send the data via mailerlite.subscribers.createOrUpdate(res.data.data) and it throws:

>  MailerLite/Index: Internal Error 422 {
>    message: 'The groups.0 field must be a number. (and 1 more error)',
>    errors: {
>      'groups.0': [
>        'The groups.0 field must be a number.',
>        'The selected groups.0 is not numeric.'
>      ]
>    }
>  }

Apparently, the createOrUpdate API expects the groups to be an array of numbers? But the MailerLite Dashboard works as expected. And the mailerlite.groups.assignSubscriber expects the groupId to be provided as a string, and thus also stores it as a string into the array of the user object in the database?

Workaround

Since the createOrUpdate function appears to work as a merge with all the information in the database. The workaround is to simply remove the groups field from any updates or just provide a object with only the fields one wants to update:

const data = {
  email: res.email,
  fields: {
    name: 'MY NAME IS TEST',
  },
}
const res2 = await createOrUpdateSubscriber(data)
console.log(res2)