accepts_nested_attributes_for and after_remove

Question

I have a model like so

class Post < ApplicationRecord

  has_many :comments,
            after_add: :soil,
            after_remove: :soil,
            dependent: :destroy

  attr_accessor :soiled_associations

  accepts_nested_attributes_for :comments, allow_destroy: true

  def soil(record)
    self.soiled_associations = [record]
  end
end

When I add a new comment in the view it adds the object to my post.soiled_associations attribute (BTW soiled_associations is my attempt to name a custom method that does something similar to Rails's Dirty class, but for associations).

However, when I delete a comment in my view nothing gets added to the post.soiled_associations attribute.

What am I doing wrong? I suspect it is in something about how accepts_nested_attributes_for works (perhaps bypassing these callbacks) but can anybody shed some light on this?

Answer 1

Can't tell you what you are doing wrong since you haven't shown what you're doing. But there are only a few ways to do it:

>> Post.new(comments_attributes: [{}]).soiled_associations
=> [#<Comment:0x00007f01e99a30c0 id: nil, post_id: nil>]

>> Post.create(comments_attributes: [{}]).soiled_associations
=> [#<Comment:0x00007f01e9a08fd8 id: 3, post_id: 2>]

>> post = Post.last
>> post.comments.destroy_all
>> post.soiled_associations
=> [#<Comment:0x00007f01e99867e0 id: 3, post_id: 2>]

>> Post.create(comments_attributes: [{}])
>> post = Post.last
>> post.update(comments_attributes: [{id: 4, _destroy: true}])
>> post.soiled_associations
=> [#<Comment:0x00007f01e99a5500 id: 4, post_id: 3>]