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
|
require 'active_support/core_ext/object/blank'
module ActiveRecord
module AttributeMethods
module Dirty
extend ActiveSupport::Concern
include ActiveModel::Dirty
included do
alias_method_chain :save, :dirty
alias_method_chain :save!, :dirty
alias_method_chain :update, :dirty
alias_method_chain :reload, :dirty
superclass_delegating_accessor :partial_updates
self.partial_updates = true
end
# Attempts to +save+ the record and clears changed attributes if successful.
def save_with_dirty(*args) #:nodoc:
if status = save_without_dirty(*args)
@previously_changed = changes
@changed_attributes.clear
end
status
end
# Attempts to <tt>save!</tt> the record and clears changed attributes if successful.
def save_with_dirty!(*args) #:nodoc:
save_without_dirty!(*args).tap do
@previously_changed = changes
@changed_attributes.clear
end
end
# <tt>reload</tt> the record and clears changed attributes.
def reload_with_dirty(*args) #:nodoc:
reload_without_dirty(*args).tap do
@previously_changed.clear
@changed_attributes.clear
end
end
private
# Wrap write_attribute to remember original attribute value.
def write_attribute(attr, value)
attr = attr.to_s
# The attribute already has an unsaved change.
if attribute_changed?(attr)
old = @changed_attributes[attr]
@changed_attributes.delete(attr) unless field_changed?(attr, old, value)
else
old = clone_attribute_value(:read_attribute, attr)
@changed_attributes[attr] = old if field_changed?(attr, old, value)
end
# Carry on.
super(attr, value)
end
def update_with_dirty
if partial_updates?
# Serialized attributes should always be written in case they've been
# changed in place.
update_without_dirty(changed | (attributes.keys & self.class.serialized_attributes.keys))
else
update_without_dirty
end
end
def field_changed?(attr, old, value)
if column = column_for_attribute(attr)
if column.number? && column.null && (old.nil? || old == 0) && value.blank?
# For nullable numeric columns, NULL gets stored in database for blank (i.e. '') values.
# Hence we don't record it as a change if the value changes from nil to ''.
# If an old value of 0 is set to '' we want this to get changed to nil as otherwise it'll
# be typecast back to 0 (''.to_i => 0)
value = nil
else
value = column.type_cast(value)
end
end
old != value
end
end
end
end
|
