Trouble with accepts_nested_attributes_for in Rails 5.0.0.beta3, -api option

Question

I am using Rails 5.0.0.beta3, building an API-only app using the -app option on rails new, and I am having trouble with accepts_nested_attributes_for.

In my app, a

Answer 1

I had the same problem and I found the solution in https://github.com/rails/rails/issues/18233

Just add

class Post < ApplicationRecord
belongs_to :member, required: false
end

It seems a problem with accepts_nested_attributes_for in Rails 5, so you need add required: false to your child models.

Answer 2

I found that adding the inverse_of options to the associations allowed accepts_nested_attributes to work. Nice than monkey patching, still allows the association to be validated

Answer 3

I am experiencing problems with accepts_nested_attributes_for as well in my Rails 5 beta 3 app and seems like it is buggy. Ideally, a bug report should be submitted, but we didn't have time to do it properly. We have the following setup:

accepts_nested_attributes_for :attachments, allow_destroy: true

Eventually, we had to monkey-patch the method inside the model like this:

  def attachments_attributes=(attributes)
    attributes.reject! do |_attachment|  
      if _attachment = Attachment.find(_attachment['id'])
        if _attachment.drop_id.nil?
          attachments << _attachment
          next true
        end
      end
      next false
    end
    # assign_nested_attributes_for_collection_association(:attachments, attributes)
  end

The only thing is that the last (commented-out line) with assign_nested_attributes_for_collection_association has some issues, but hopefully this will provide you an idea how this can be fixed.

Answer 4

This is a regression reported as rails#25198. As was pointed out, you may use inverse_of as a workaround.

It is planned to be fixed in 5.0.1.

Answer 5

I also encountered the same problem.
It seems specification has been changed from Rails 5.
By putting the option, and the previous and the same operation.

belongs_to should default to required: true #18233

class Post < ApplicationRecord
  belongs_to :member, optional: true
end

It is my clumsy may speak English, but ...