Breaks with Rails 5.1

[nguyen-tran]

Association between models not created when setting IDs and calling save. Dirty tracking will always return [nil, nil] even when setting IDs to the same IDs.

Gem: 0.2.1
Rails: 5.1

[uberllama]

The Dirty implementation in Rails 5.2 has changed to operate only against AR attributes. Changes are still propagated but dirty tracking is lost w 5.2. I will need to do a rethink/rewrite. Thx.

[bazzel]

Not sure if this helps. I ran into the same issue when I wanted to track changes to an association.

project = Project.first
project.user_ids = [1,2,3]
project.changes

I added an extra column user_ids_cache to the projects table that gets updated by the after_ callbacks of the association. By aliasing some attributes you should get the same result as before.

class AddUserIdsCacheToPatch < ActiveRecord::Migration[5.2]
  def change
    add_column :projects, :user_ids_cache, :text
  end
end

class Project
  serialize :user_ids_cache, Array

  has_many :users, after_add: cache_user_ids,
                   after_remove: cache_user_ids

  alias_attribute :user_ids_changed, :user_ids_cache_changed
  alias_attribute :user_ids_was, :user_ids_cache_was
  
  private
  
  def cache_user_ids
    self.user_ids_cache = user_ids.sort
  end
  ...
end

[uberllama]

Thanks @bazzel just got back from vacation but I'll check out your solution.