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module ActiveRecord
module Validations
class AssociatedValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
return if (value.is_a?(Array) ? value : [value]).collect{ |r| r.nil? || r.valid? }.all?
record.errors.add(attribute, :invalid, options.merge(:value => value))
end
end
module ClassMethods
# Validates whether the associated object or objects are all valid themselves. Works with any kind of association.
#
# class Book < ActiveRecord::Base
# has_many :pages
# belongs_to :library
#
# validates_associated :pages, :library
# end
#
# Warning: If, after the above definition, you then wrote:
#
# class Page < ActiveRecord::Base
# belongs_to :book
#
# validates_associated :book
# end
#
# this would specify a circular dependency and cause infinite recursion.
#
# NOTE: This validation will not fail if the association hasn't been assigned. If you want to
# ensure that the association is both present and guaranteed to be valid, you also need to
# use +validates_presence_of+.
#
# Configuration options:
# * <tt>:message</tt> - A custom error message (default is: "is invalid")
# * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</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.
def validates_associated(*attr_names)
validates_with AssociatedValidator, _merge_attributes(attr_names)
end
end
end
end
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