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Contents
require 'hermod/validators/base'
module Hermod
module Validators
# This checks if the given value is an instance of a certain class
class TypeChecker < Base
attr_reader :expected_class, :checker
# Sets up the validator with the class it is expected to be. You can
# optionally pass a block to customise the class matching logic
#
# Examples
#
# TypeChecker.new(Integer)
#
# TypeChecker.new(Date) { |value| value.respond_to? :strftime }
#
def initialize(expected_class, &block)
@expected_class = expected_class
@checker = block || proc { |value| value.is_a? expected_class }
end
private
def test(value, attributes)
value.blank? || checker.call(value)
end
def message(value, attributes)
expected_class_name = expected_class.name.downcase
join_word = (%w(a e i o u).include?(expected_class_name[0]) ? "an" : "a")
"must be #{join_word} #{expected_class_name}"
end
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems