class RepositoryRowMyModule < ActiveRecord::Base validates :repository_row, :my_module, presence: true # One row can only be assigned once to a specific module validates_uniqueness_of :repository_row_id, :scope => :my_module_id belongs_to :assigned_by, foreign_key: 'assigned_by_id', class_name: 'User' belongs_to :repository_row, inverse_of: :repository_row_my_modules belongs_to :my_module, inverse_of: :repository_row_my_modules end