Example code for Fix Destroy Arity rails pull request

habtm_destroy_test.rb

# Dev with custom destroy taking extra params
class DeveloperWithCustomDestroyMethod < ActiveRecord::Base
  self.table_name = 'developers'
  has_and_belongs_to_many :projects, :join_table => 'developers_projects', :foreign_key => 'developer_id'

  def destroy(options ={})
    super
  end
end


class HasAndBelongsToManyAssociationsTest < ActiveRecord::TestCase

  # test which uses custom destroy
  def test_removing_associations_on_destroy_with_a_custom_destroy_method
    david = DeveloperWithCustomDestroyMethod.find(1)
    assert !david.projects.empty?
    david.destroy(:with_due_diligence => true)
    assert david.projects.empty?
    assert DeveloperWithCustomDestroyMethod.connection.select_all("SELECT * FROM developers_projects WHERE developer_id = 1").empty?
  end

end