blob: 6885c6800e55c1fe26d97212890ed1e24b4fe875 (
plain) (
blame)
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
|
module ActiveModel #:nodoc:
# A simple base class that can be used along with ActiveModel::Base.validates_with
#
# class Person < ActiveModel::Base
# validates_with MyValidator
# end
#
# class MyValidator < ActiveModel::Validator
# def validate
# if some_complex_logic
# record.errors[:base] = "This record is invalid"
# end
# end
#
# private
# def some_complex_logic
# # ...
# end
# end
#
# Any class that inherits from ActiveModel::Validator will have access to <tt>record</tt>,
# which is an instance of the record being validated, and must implement a method called <tt>validate</tt>.
#
# class Person < ActiveModel::Base
# validates_with MyValidator
# end
#
# class MyValidator < ActiveModel::Validator
# def validate
# record # => The person instance being validated
# options # => Any non-standard options passed to validates_with
# end
# end
#
# To cause a validation error, you must add to the <tt>record<tt>'s errors directly
# from within the validators message
#
# class MyValidator < ActiveModel::Validator
# def validate
# record.errors[:base] << "This is some custom error message"
# record.errors[:first_name] << "This is some complex validation"
# # etc...
# end
# end
#
# To add behavior to the initialize method, use the following signature:
#
# class MyValidator < ActiveModel::Validator
# def initialize(record, options)
# super
# @my_custom_field = options[:field_name] || :first_name
# end
# end
#
class Validator
attr_reader :options
def initialize(options)
@options = options
end
def validate(record)
raise NotImplementedError
end
end
class EachValidator < Validator
attr_reader :attributes
def initialize(options)
@attributes = options.delete(:attributes)
super
end
def validate(record)
attributes.each do |attribute|
value = record.send(:read_attribute_for_validation, attribute)
next if (value.nil? && options[:allow_nil]) || (value.blank? && options[:allow_blank])
validate_each(record, attribute, value)
end
end
def validate_each(record)
raise NotImplementedError
end
end
end
|
