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
121
122
123
124
125
126
127
|
# frozen_string_literal: true
module ActiveRecord::Associations::Builder # :nodoc:
class BelongsTo < SingularAssociation #:nodoc:
def self.macro
:belongs_to
end
def self.valid_options(options)
super + [:polymorphic, :touch, :counter_cache, :optional, :default]
end
def self.valid_dependent_options
[:destroy, :delete]
end
def self.define_callbacks(model, reflection)
super
add_counter_cache_callbacks(model, reflection) if reflection.options[:counter_cache]
add_touch_callbacks(model, reflection) if reflection.options[:touch]
add_default_callbacks(model, reflection) if reflection.options[:default]
end
def self.add_counter_cache_callbacks(model, reflection)
cache_column = reflection.counter_cache_column
model.after_update lambda { |record|
association = association(reflection.name)
if association.target_changed?
association.increment_counters
association.decrement_counters_before_last_save
end
}
klass = reflection.class_name.safe_constantize
klass.attr_readonly cache_column if klass && klass.respond_to?(:attr_readonly)
end
def self.touch_record(o, changes, foreign_key, name, touch, touch_method) # :nodoc:
old_foreign_id = changes[foreign_key] && changes[foreign_key].first
if old_foreign_id
association = o.association(name)
reflection = association.reflection
if reflection.polymorphic?
foreign_type = reflection.foreign_type
klass = changes[foreign_type] && changes[foreign_type].first || o.public_send(foreign_type)
klass = klass.constantize
else
klass = association.klass
end
primary_key = reflection.association_primary_key(klass)
old_record = klass.find_by(primary_key => old_foreign_id)
if old_record
if touch != true
old_record.send(touch_method, touch)
else
old_record.send(touch_method)
end
end
end
record = o.send name
if record && record.persisted?
if touch != true
record.send(touch_method, touch)
else
record.send(touch_method)
end
end
end
def self.add_touch_callbacks(model, reflection)
foreign_key = reflection.foreign_key
n = reflection.name
touch = reflection.options[:touch]
callback = lambda { |changes_method| lambda { |record|
BelongsTo.touch_record(record, record.send(changes_method), foreign_key, n, touch, belongs_to_touch_method)
}}
if reflection.counter_cache_column
touch_callback = callback.(:saved_changes)
update_callback = lambda { |record|
instance_exec(record, &touch_callback) unless association(reflection.name).target_changed?
}
model.after_update update_callback, if: :saved_changes?
else
model.after_create callback.(:saved_changes), if: :saved_changes?
model.after_update callback.(:saved_changes), if: :saved_changes?
model.after_destroy callback.(:changes_to_save)
end
model.after_touch callback.(:changes_to_save)
end
def self.add_default_callbacks(model, reflection)
model.before_validation lambda { |o|
o.association(reflection.name).default(&reflection.options[:default])
}
end
def self.add_destroy_callbacks(model, reflection)
model.after_destroy lambda { |o| o.association(reflection.name).handle_dependency }
end
def self.define_validations(model, reflection)
if reflection.options.key?(:required)
reflection.options[:optional] = !reflection.options.delete(:required)
end
if reflection.options[:optional].nil?
required = model.belongs_to_required_by_default
else
required = !reflection.options[:optional]
end
super
if required
model.validates_presence_of reflection.name, message: :required
end
end
end
end
|
