module ActiveModel module Validations module ClassMethods # 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 :create, :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 (e.g. :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) configuration = { :allow_nil => true, :accept => "1" } configuration.update(attr_names.extract_options!) db_cols = begin column_names rescue Exception # To ignore both statement and connection errors [] end names = attr_names.reject { |name| db_cols.include?(name.to_s) } attr_accessor(*names) validates_each(attr_names,configuration) do |record, attr_name, value| unless value == configuration[:accept] record.errors.add(attr_name, :accepted, :default => configuration[:message]) end end end end end end