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Contents
module DataMapper
module Validate
##
#
# @author Guy van den Berg
# @since 0.9
class MethodValidator < GenericValidator
def initialize(field_name, options={})
super
@field_name, @options = field_name, options.clone
@options[:method] = @field_name unless @options.has_key?(:method)
end
def call(target)
result,message = target.send(@options[:method])
add_error(target,message,@field_name) if !result
result
end
def ==(other)
@options[:method] == other.instance_variable_get(:@options)[:method] && super
end
end # class MethodValidator
module ValidatesWithMethod
##
# Validate using the given method. The method given needs to return:
# [result::<Boolean>, Error Message::<String>]
#
# @example [Usage]
# require 'dm-validations'
#
# class Page
# include DataMapper::Resource
#
# property :zip_code, String
#
# validates_with_method :in_the_right_location?
#
# def in_the_right_location?
# if @zip_code == "94301"
# return true
# else
# return [false, "You're in the wrong zip code"]
# end
# end
#
# # A call to valid? will return false and
# # populate the object's errors with "You're in the
# # wrong zip code" unless zip_code == "94301"
#
# # You can also specify field:
#
# validates_with_method :zip_code, :in_the_right_location?
#
# # it will add returned error message to :zip_code field
#
def validates_with_method(*fields)
opts = opts_from_validator_args(fields)
add_validator_to_context(opts, fields, DataMapper::Validate::MethodValidator)
end
end # module ValidatesWithMethod
end # module Validate
end # module DataMapper
Version data entries
9 entries across 9 versions & 2 rubygems