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module ActiveRecord
module Validations
class AssociatedValidator < ActiveModel::EachValidator #:nodoc:
def validate_each(record, attribute, value)
if Array.wrap(value).reject {|r| r.marked_for_destruction? || r.valid?(record.validation_context) }.any?
record.errors.add(attribute, :invalid, options.merge(:value => value))
end
end
end
module ClassMethods
# Validates whether the associated object or objects are all valid.
# Works with any kind of association.
#
# class Book < ActiveRecord::Base
# has_many :pages
# belongs_to :library
#
# validates_associated :pages, :library
# end
#
# WARNING: This validation must not be used on both ends of an association.
# Doing so will lead to 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. Runs in all
# validation contexts by default (+nil+), other options are <tt>:create</tt>
# and <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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