/usr/lib/ruby/vendor_ruby/active_record/attribute_methods/serialization.rb is in ruby-activerecord-3.2 3.2.16-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 | 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, options = {}) #:nodoc:
serialized = (options.delete(:serialized) { true }) ? :serialized : :unserialized
super(attributes, options)
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
def _field_changed?(attr, old, value)
if self.class.serialized_attributes.include?(attr)
old != value
else
super
end
end
def read_attribute_before_type_cast(attr_name)
if serialized_attributes.include?(attr_name)
super.unserialized_value
else
super
end
end
def attributes_before_type_cast
super.dup.tap do |attributes|
self.class.serialized_attributes.each_key do |key|
if attributes.key?(key)
attributes[key] = attributes[key].unserialized_value
end
end
end
end
end
end
end
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