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tag: v3.2.9
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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
# The enhanced read method automatically converts the UTC time stored in the database to the time
# zone stored in Time.zone.
def attribute_cast_code(attr_name)
column = columns_hash[attr_name]
if create_time_zone_conversion_attribute?(attr_name, column)
typecast = "v = #{super}"
time_zone_conversion = "v.acts_like?(:time) ? v.in_time_zone : v"
"((#{typecast}) && (#{time_zone_conversion}))"
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
zoned_time = time && time.in_time_zone rescue nil
rounded_time = round_usec(zoned_time)
rounded_value = round_usec(read_attribute("#{attr_name}"))
if (rounded_value != rounded_time) || (!rounded_value && original_time)
write_attribute("#{attr_name}", original_time)
#{attr_name}_will_change!
@attributes_cache["#{attr_name}"] = zoned_time
end
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
private
def round_usec(value)
return unless value
value.change(:usec => 0)
end
end
end
end
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