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Versions: 9
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Contents
require 'active_model/validator'
module ROM
module Model
module Validator
# Uniqueness validation
#
# @api public
class UniquenessValidator < ActiveModel::EachValidator
# Relation validator class
#
# @api private
attr_reader :klass
# error message
#
# @return [String, Symbol]
#
# @api private
attr_reader :message
# @api private
def initialize(options)
super
@klass = options.fetch(:class)
@message = options.fetch(:message) { :taken }
@scope_keys = options[:scope]
end
# Hook called by ActiveModel internally
#
# @api private
def validate_each(validator, name, value)
scope = Array(@scope_keys).each_with_object({}) do |key, scope|
scope[key] = validator.to_model[key]
end
validator.errors.add(name, message) unless unique?(name, value, scope)
end
private
# Get relation object from the rom env
#
# @api private
def relation
if relation_name
rom.relations[relation_name]
else
raise "relation must be specified to use uniqueness validation"
end
end
# Relation name defined on the validator class
#
# @api private
def relation_name
klass.relation
end
# Shortcut to access global rom env
#
# @return [ROM::Env]
#
# @api private
def rom
ROM.env
end
# Ask relation if a given attribute value is unique
#
# This uses `Relation#unique?` interface that not all adapters can
# implement.
#
# @return [TrueClass,FalseClass]
#
# @api private
def unique?(name, value, scope)
relation.unique?({name => value}.merge(scope))
end
end
end
end
end
Version data entries
9 entries across 9 versions & 2 rubygems