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Contents
# encoding: utf-8
module Mongoid #:nodoc:
module Validations #:nodoc:
# Validates whether or not a field is unique against the documents in the
# database.
#
# Example:
#
# class Person
# include Mongoid::Document
# field :title
#
# validates_uniqueness_of :title
# end
class UniquenessValidator < ActiveModel::EachValidator
# Unfortunately, we have to tie Uniqueness validators to a class.
def setup(klass)
@klass = klass
end
def validate_each(document, attribute, value)
if document.embedded?
return if document._parent.nil?
criteria = document._parent.send(document.association_name)
# If the parent document embeds_one, no need to validate uniqueness
return if criteria.is_a?(Mongoid::Document)
criteria = criteria.where(attribute => value, :_id => {'$ne' => document._id})
else
criteria = @klass.where(attribute => value)
unless document.new_record?
criteria = criteria.where(:_id => {'$ne' => document._id})
end
end
Array.wrap(options[:scope]).each do |item|
criteria = criteria.where(item => document.attributes[item])
end
if criteria.exists?
document.errors.add(
attribute,
:taken,
options.except(:case_sensistive, :scope).merge(:value => value)
)
end
end
protected
def key_changed?(document)
(document.primary_key || {}).each do |key|
return true if document.send("#{key}_changed?")
end; false
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems