diff options
Diffstat (limited to 'activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb')
-rw-r--r-- | activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb b/activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb new file mode 100644 index 0000000000..f379b4c0f8 --- /dev/null +++ b/activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb @@ -0,0 +1,60 @@ +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_inheritable_accessor :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_attribute_method(attr_name) + if create_time_zone_conversion_attribute?(attr_name, columns_hash[attr_name]) + method_body = <<-EOV + def #{attr_name}(reload = false) + cached = @attributes_cache['#{attr_name}'] + return cached if cached && !reload + time = read_attribute('#{attr_name}') + @attributes_cache['#{attr_name}'] = time.acts_like?(:time) ? time.in_time_zone : time + end + EOV + evaluate_attribute_method attr_name, method_body, attr_name + 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_attribute_method=(attr_name) + if create_time_zone_conversion_attribute?(attr_name, columns_hash[attr_name]) + method_body = <<-EOV + def #{attr_name}=(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}, time) + end + EOV + evaluate_attribute_method attr_name, method_body, "#{attr_name}=" + else + super + end + end + + private + def create_time_zone_conversion_attribute?(name, column) + time_zone_aware_attributes && !skip_time_zone_conversion_for_attributes.include?(name.to_sym) && [:datetime, :timestamp].include?(column.type) + end + end + end + end +end |