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
|
require 'active_support/core_ext/class/attribute'
require 'active_support/core_ext/object/inclusion'
module ActiveRecord
module AttributeMethods
module TimeZoneConversion
extend ActiveSupport::Concern
included do
cattr_accessor :time_zone_aware_attributes, :instance_writer => false
self.time_zone_aware_attributes = false
class_attribute :skip_time_zone_conversion_for_attributes, :instance_writer => false
self.skip_time_zone_conversion_for_attributes = []
end
module ClassMethods
protected
# Defined for all +datetime+ and +timestamp+ attributes when +time_zone_aware_attributes+ are enabled.
# This enhanced read method automatically converts the UTC time stored in the database to the time
# zone stored in Time.zone.
def internal_attribute_access_code(attr_name)
column = columns_hash[attr_name]
if create_time_zone_conversion_attribute?(attr_name, column)
<<-CODE
cached = @attributes_cache['#{attr_name}']
return cached if cached
v = @attributes['#{attr_name}']
time = #{column.type_cast_code('v')}
@attributes_cache['#{attr_name}'] = time.acts_like?(:time) ? time.in_time_zone : time
CODE
else
super
end
end
def external_attribute_access_code(attr_name)
column = columns_hash[attr_name]
if create_time_zone_conversion_attribute?(attr_name, column)
"attributes_cache[attr_name] ||= (#{attribute_cast_code(attr_name)})"
else
super
end
end
def attribute_cast_code(attr_name)
if create_time_zone_conversion_attribute?(attr_name, columns_hash[attr_name])
"v.acts_like?(:time) ? v.in_time_zone : v"
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
write_attribute(:#{attr_name}, original_time)
@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) && column.type.in?([:datetime, :timestamp])
end
end
end
end
end
|
