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module ActiveModel
module Validations
module HelperMethods
private
def _merge_attributes(attr_names)
options = attr_names.extract_options!.symbolize_keys
attr_names.flatten!
options[:attributes] = attr_names
options
end
end
class WithValidator < EachValidator # :nodoc:
def validate_each(record, attr, val)
method_name = options[:with]
if record.method(method_name).arity == 0
record.send method_name
else
record.send method_name, attr
end
end
end
module ClassMethods
# Passes the record off to the class or classes specified and allows them
# to add errors based on more complex conditions.
#
# class Person
# include ActiveModel::Validations
# validates_with MyValidator
# end
#
# class MyValidator < ActiveModel::Validator
# def validate(record)
# if some_complex_logic
# record.errors.add :base, 'This record is invalid'
# end
# end
#
# private
# def some_complex_logic
# # ...
# end
# end
#
# You may also pass it multiple classes, like so:
#
# class Person
# include ActiveModel::Validations
# validates_with MyValidator, MyOtherValidator, on: :create
# end
#
# Configuration options:
# * <tt>:on</tt> - Specifies the contexts where this validation is active.
# Runs in all validation contexts by default (nil). You can pass a symbol
# or an array of symbols. (e.g. <tt>on: :create</tt> or
# <tt>on: :custom_validation_context</tt> or
# <tt>on: [:create, :custom_validation_context]</tt>)
# * <tt>:if</tt> - Specifies a method, proc or string to call to determine
# if the validation should occur (e.g. <tt>if: :allow_validation</tt>,
# or <tt>if: Proc.new { |user| user.signup_step > 2 }</tt>).
# The method, proc or string should return or evaluate to a +true+ or
# +false+ value.
# * <tt>:unless</tt> - Specifies a method, proc or string to call to
# determine if the validation should not occur
# (e.g. <tt>unless: :skip_validation</tt>, or
# <tt>unless: Proc.new { |user| user.signup_step <= 2 }</tt>).
# The method, proc or string should return or evaluate to a +true+ or
# +false+ value.
# * <tt>:strict</tt> - Specifies whether validation should be strict.
# See <tt>ActiveModel::Validation#validates!</tt> for more information.
#
# If you pass any additional configuration options, they will be passed
# to the class and available as +options+:
#
# class Person
# include ActiveModel::Validations
# validates_with MyValidator, my_custom_key: 'my custom value'
# end
#
# class MyValidator < ActiveModel::Validator
# def validate(record)
# options[:my_custom_key] # => "my custom value"
# end
# end
def validates_with(*args, &block)
options = args.extract_options!
options[:class] = self
args.each do |klass|
validator = klass.new(options, &block)
if validator.respond_to?(:attributes) && !validator.attributes.empty?
validator.attributes.each do |attribute|
_validators[attribute.to_sym] << validator
end
else
_validators[nil] << validator
end
validate(validator, options)
end
end
end
# Passes the record off to the class or classes specified and allows them
# to add errors based on more complex conditions.
#
# class Person
# include ActiveModel::Validations
#
# validate :instance_validations
#
# def instance_validations
# validates_with MyValidator
# end
# end
#
# Please consult the class method documentation for more information on
# creating your own validator.
#
# You may also pass it multiple classes, like so:
#
# class Person
# include ActiveModel::Validations
#
# validate :instance_validations, on: :create
#
# def instance_validations
# validates_with MyValidator, MyOtherValidator
# end
# end
#
# Standard configuration options (<tt>:on</tt>, <tt>:if</tt> and
# <tt>:unless</tt>), which are available on the class version of
# +validates_with+, should instead be placed on the +validates+ method
# as these are applied and tested in the callback.
#
# If you pass any additional configuration options, they will be passed
# to the class and available as +options+, please refer to the
# class version of this method for more information.
def validates_with(*args, &block)
options = args.extract_options!
options[:class] = self.class
args.each do |klass|
validator = klass.new(options, &block)
validator.validate(self)
end
end
end
end
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