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module ActiveRecord
module AttributeMethods
module TimeZoneConversion
class Type # :nodoc:
delegate :type, :type_cast_for_database, to: :@column
def initialize(column)
@column = column
end
def type_cast(value)
value = @column.type_cast(value)
value.acts_like?(:time) ? value.in_time_zone : value
end
end
extend ActiveSupport::Concern
included do
mattr_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+ 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}=(time)
time_with_zone = time.respond_to?(:in_time_zone) ? time.in_time_zone : nil
previous_time = attribute_changed?("#{attr_name}") ? changed_attributes["#{attr_name}"] : read_attribute(:#{attr_name})
write_attribute(:#{attr_name}, time)
#{attr_name}_will_change! if previous_time != time_with_zone
@attributes["#{attr_name}"] = time_with_zone
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) &&
(:datetime == column.type)
end
end
end
end
end
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