class MyModuleRepositoryRow < ApplicationRecord belongs_to :assigned_by, foreign_key: 'assigned_by_id', class_name: 'User', optional: true belongs_to :repository_row, optional: true, inverse_of: :my_module_repository_rows belongs_to :my_module, optional: true, inverse_of: :my_module_repository_rows validates :repository_row, :my_module, presence: true validates :repository_row, uniqueness: { scope: :my_module } end