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require 'active_support/core_ext/class/attribute'
module ActiveRecord
ActiveSupport.on_load(:active_record_config) do
mattr_accessor :time_zone_aware_attributes, instance_accessor: false
self.time_zone_aware_attributes = false
mattr_accessor :skip_time_zone_conversion_for_attributes, instance_accessor: false
self.skip_time_zone_conversion_for_attributes = []
end
module AttributeMethods
module TimeZoneConversion
class Type # :nodoc:
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
def type
@column.type
end
end
extend ActiveSupport::Concern
included do
config_attribute :time_zone_aware_attributes, global: true
config_attribute :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
time = time.in_time_zone rescue nil if time
changed = read_attribute(:#{attr_name}) != time
write_attribute(:#{attr_name}, original_time)
#{attr_name}_will_change! if changed
@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) &&
[:datetime, :timestamp].include?(column.type)
end
end
end
end
end
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