module ActiveModel # == Active Model Acceptance Validator module Validations class AcceptanceValidator < EachValidator def initialize(options) super(options.reverse_merge(:allow_nil => true, :accept => "1")) end def validate_each(record, attribute, value) unless value == options[:accept] record.errors.add(attribute, :accepted, options.except(:accept, :allow_nil)) end end def setup(klass) # Note: instance_methods.map(&:to_s) is important for 1.9 compatibility # as instance_methods returns symbols unlike 1.8 which returns strings. attr_readers = attributes.reject { |name| klass.attribute_method?(name) } attr_writers = attributes.reject { |name| klass.attribute_method?("#{name}=") } klass.send(:attr_reader, *attr_readers) klass.send(:attr_writer, *attr_writers) end end module HelperMethods # Encapsulates the pattern of wanting to validate the acceptance of a # terms of service check box (or similar agreement). Example: # # class Person < ActiveRecord::Base # validates_acceptance_of :terms_of_service # validates_acceptance_of :eula, :message => "must be abided" # end # # If the database column does not exist, the +terms_of_service+ attribute # is entirely virtual. This check is performed only if +terms_of_service+ # is not +nil+ and by default on save. # # Configuration options: # * :message - A custom error message (default is: "must be # accepted"). # * :on - Specifies when this validation is active (default is # :save, other options are :create and # :update). # * :allow_nil - Skip validation if attribute is +nil+ (default # is true). # * :accept - Specifies value that is considered accepted. # The default value is a string "1", which makes it easy to relate to # an HTML checkbox. This should be set to +true+ if you are validating # a database column, since the attribute is typecast from "1" to +true+ # before validation. # * :if - Specifies a method, proc or string to call to determine # if the validation should occur (e.g. :if => :allow_validation, # or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false # value. # * :unless - Specifies a method, proc or string to call to # determine if the validation should not occur (for example, # :unless => :skip_validation, or # :unless => Proc.new { |user| user.signup_step <= 2 }). # The method, proc or string should return or evaluate to a true or # false value. def validates_acceptance_of(*attr_names) validates_with AcceptanceValidator, _merge_attributes(attr_names) end end end end