require 'active_support/core_ext/class/attribute' require 'active_support/core_ext/object/inclusion' module ActiveRecord module AttributeMethods module TimeZoneConversion extend ActiveSupport::Concern included do cattr_accessor :time_zone_aware_attributes, :instance_writer => false self.time_zone_aware_attributes = false class_attribute :skip_time_zone_conversion_for_attributes, :instance_writer => false self.skip_time_zone_conversion_for_attributes = [] end module ClassMethods protected # Defined for all +datetime+ and +timestamp+ attributes when +time_zone_aware_attributes+ are enabled. # This enhanced read method automatically converts the UTC time stored in the database to the time # zone stored in Time.zone. def define_method_attribute(attr_name) if create_time_zone_conversion_attribute?(attr_name, columns_hash[attr_name]) method_body, line = <<-EOV, __LINE__ + 1 def _#{attr_name} cached = @attributes_cache['#{attr_name}'] return cached if cached time = _read_attribute('#{attr_name}') @attributes_cache['#{attr_name}'] = time.acts_like?(:time) ? time.in_time_zone : time end alias #{attr_name} _#{attr_name} EOV generated_attribute_methods.module_eval(method_body, __FILE__, line) else super end end # Defined for all +datetime+ and +timestamp+ attributes when +time_zone_aware_attributes+ are enabled. # This enhanced write method will automatically convert the time passed to it to the zone stored in Time.zone. def define_method_attribute=(attr_name) if create_time_zone_conversion_attribute?(attr_name, columns_hash[attr_name]) method_body, line = <<-EOV, __LINE__ + 1 def #{attr_name}=(original_time) time = original_time unless time.acts_like?(:time) time = time.is_a?(String) ? Time.zone.parse(time) : time.to_time rescue time end time = time.in_time_zone rescue nil if time write_attribute(:#{attr_name}, original_time) @attributes_cache["#{attr_name}"] = time end EOV generated_attribute_methods.module_eval(method_body, __FILE__, line) else super end end private def create_time_zone_conversion_attribute?(name, column) time_zone_aware_attributes && !self.skip_time_zone_conversion_for_attributes.include?(name.to_sym) && column.type.in?([:datetime, :timestamp]) end end end end end