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module ActiveRecord
module AttributeMethods
module Serialization
extend ActiveSupport::Concern
included do
# Returns a hash of all the attributes that have been specified for serialization as
# keys and their class restriction as values.
class_attribute :serialized_attributes
self.serialized_attributes = {}
end
class Attribute < Struct.new(:coder, :value, :state)
def unserialized_value
state == :serialized ? unserialize : value
end
def serialized_value
state == :unserialized ? serialize : value
end
def unserialize
self.state = :unserialized
self.value = coder.load(value)
end
def serialize
self.state = :serialized
self.value = coder.dump(value)
end
end
module ClassMethods
# If you have an attribute that needs to be saved to the database as an object, and retrieved as the same object,
# then specify the name of that attribute using this method and it will be handled automatically.
# The serialization is done through YAML. If +class_name+ is specified, the serialized object must be of that
# class on retrieval or SerializationTypeMismatch will be raised.
#
# ==== Parameters
#
# * +attr_name+ - The field name that should be serialized.
# * +class_name+ - Optional, class name that the object type should be equal to.
#
# ==== Example
# # Serialize a preferences attribute
# class User < ActiveRecord::Base
# serialize :preferences
# end
def serialize(attr_name, class_name = Object)
coder = if [:load, :dump].all? { |x| class_name.respond_to?(x) }
class_name
else
Coders::YAMLColumn.new(class_name)
end
# merge new serialized attribute and create new hash to ensure that each class in inheritance hierarchy
# has its own hash of own serialized attributes
self.serialized_attributes = serialized_attributes.merge(attr_name.to_s => coder)
end
def initialize_attributes(attributes) #:nodoc:
super
serialized_attributes.each do |key, coder|
if attributes.key?(key)
attributes[key] = Attribute.new(coder, attributes[key], :serialized)
end
end
attributes
end
private
def attribute_cast_code(attr_name)
if serialized_attributes.include?(attr_name)
"v.unserialized_value"
else
super
end
end
end
def type_cast_attribute_for_write(column, value)
if column && coder = self.class.serialized_attributes[column.name]
Attribute.new(coder, value, :unserialized)
else
super
end
end
end
end
end
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