method
reader_method
reader_method(name, class_name, mapping, allow_nil, constructor)
private
Hide source
# File activerecord/lib/active_record/aggregations.rb, line 246 def reader_method(name, class_name, mapping, allow_nil, constructor) define_method(name) do if @aggregation_cache[name].nil? && (!allow_nil || mapping.any? { |key, _| !_read_attribute(key).nil? }) attrs = mapping.collect { |key, _| _read_attribute(key) } object = constructor.respond_to?(:call) ? constructor.call(*attrs) : class_name.constantize.send(constructor, *attrs) @aggregation_cache[name] = object end @aggregation_cache[name] end end