# File lib/dm-core/associations/relationship.rb, line 182 def child_key return @child_key if defined?(@child_key) repository_name = child_repository_name || parent_repository_name properties = child_model.properties(repository_name) @child_key = if @child_properties child_key = properties.values_at(*@child_properties) properties.class.new(child_key).freeze else properties.key end end