HasManyAssociationIsCreatedWhenMarkedForDestruction

failing_test.rb

require "active_record"
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ":memory:")

RSpec.configure do |config|
  config.before(:suite) do
    Class.new(ActiveRecord::Migration) do
      def change
        create_table :parents
        create_table :children do |t|
          t.references :parent_with_autosave
          t.references :parent
        end
      end
    end.new.change
  end
end
 
class Parent < ActiveRecord::Base
  self.table_name = "parents"
  has_many :children
end

class ParentWithAutosave < ActiveRecord::Base
  self.table_name = "parents"
  has_many :children, autosave: true
end

class Child < ActiveRecord::Base
  attr_accessor :string
  validates_presence_of :string
end
 
RSpec.describe do
  def when_i_build_a_child_and_mark_it_for_destruction
    subject.children.build.mark_for_destruction
  end

  def and_i_save_and_reload_the_record
    subject.save!
    subject.reload
  end

  def when_the_child_is_valid
    subject.children[0].string = "ABC"
  end

  shared_examples_for :failing_test do
    it do
      when_i_build_a_child_and_mark_it_for_destruction
      when_the_child_is_valid
      and_i_save_and_reload_the_record
      expect(subject.children.count).to eq(0) # This fails when autosave is not used
    end

    it do
      when_i_build_a_child_and_mark_it_for_destruction
      and_i_save_and_reload_the_record
      expect(subject.children.count).to eq(0)
    end
  end

  describe Parent do
    it_behaves_like :failing_test
  end

  describe ParentWithAutosave do
    it_behaves_like :failing_test
  end
end

Gemfile

source 'https://rubygems.org'
gem "activerecord", "~> 4.2"
gem "sqlite3"
gem "rspec"