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Versions: 7
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Stored size: 1.37 KB
Contents
module Spira
module Validations
class UniquenessValidator < ActiveModel::EachValidator
# Unfortunately, we have to tie Uniqueness validators to a class.
# Note: the `setup` hook has been deprecated in rails 4.1 and completely
# removed in rails 4.2; the klass is now found in #{options[:class]}.
if ActiveModel::VERSION::MAJOR <= 3 ||
(ActiveModel::VERSION::MAJOR == 4 && ActiveModel::VERSION::MINOR < 1)
def setup(klass)
@klass = klass
end
else
def initialize(options)
super
@klass = options.fetch(:class)
end
end
def validate_each(record, attribute, value)
@klass.find_each(:conditions => {attribute => value}) do |other_record|
if other_record.subject != record.subject
record.errors.add(attribute, "is already taken")
break
end
end
end
end
module ClassMethods
# Validates whether the value of the specified attributes are unique across the system.
# Useful for making sure that only one user
# can be named "davidhh".
#
# class Person < Spira::Base
# validates_uniqueness_of :user_name
# end
#
def validates_uniqueness_of(*attr_names)
validates_with UniquenessValidator, _merge_attributes(attr_names)
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems