require 'active_support/core_ext/array/extract_options' require 'active_support/core_ext/class/attribute' require 'active_support/core_ext/hash/keys' require 'active_support/core_ext/hash/except' require 'active_model/errors' require 'active_model/validations/callbacks' module ActiveModel # == Active Model Validations # # Provides a full validation framework to your objects. # # A minimal implementation could be: # # class Person # include ActiveModel::Validations # # attr_accessor :first_name, :last_name # # validates_each :first_name, :last_name do |record, attr, value| # record.errors.add attr, 'starts with z.' if value.to_s[0] == ?z # end # end # # Which provides you with the full standard validation stack that you # know from Active Record: # # person = Person.new # person.valid? # => true # person.invalid? # => false # # person.first_name = 'zoolander' # person.valid? # => false # person.invalid? # => true # person.errors # => #["starts with z."]}> # # Note that ActiveModel::Validations automatically adds an +errors+ method # to your instances initialized with a new ActiveModel::Errors object, so # there is no need for you to do this manually. # module Validations extend ActiveSupport::Concern included do extend ActiveModel::Callbacks extend ActiveModel::Translation extend HelperMethods include HelperMethods attr_accessor :validation_context define_callbacks :validate, :scope => :name extend ActiveModel::Configuration config_attribute :_validators self._validators = Hash.new { |h,k| h[k] = [] } end module ClassMethods # Validates each attribute against a block. # # class Person # include ActiveModel::Validations # # attr_accessor :first_name, :last_name # # validates_each :first_name, :last_name, :allow_blank => true do |record, attr, value| # record.errors.add attr, 'starts with z.' if value.to_s[0] == ?z # end # end # # Options: # * :on - Specifies the context where this validation is active # (e.g. :on => :create or :on => :custom_validation_context) # * :allow_nil - Skip validation if attribute is +nil+. # * :allow_blank - Skip validation if attribute is blank. # * :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_each(*attr_names, &block) options = attr_names.extract_options!.symbolize_keys validates_with BlockValidator, options.merge(:attributes => attr_names.flatten), &block end # Adds a validation method or block to the class. This is useful when # overriding the +validate+ instance method becomes too unwieldy and # you're looking for more descriptive declaration of your validations. # # This can be done with a symbol pointing to a method: # # class Comment # include ActiveModel::Validations # # validate :must_be_friends # # def must_be_friends # errors.add(:base, "Must be friends to leave a comment") unless commenter.friend_of?(commentee) # end # end # # With a block which is passed with the current record to be validated: # # class Comment # include ActiveModel::Validations # # validate do |comment| # comment.must_be_friends # end # # def must_be_friends # errors.add(:base, "Must be friends to leave a comment") unless commenter.friend_of?(commentee) # end # end # # Or with a block where self points to the current record to be validated: # # class Comment # include ActiveModel::Validations # # validate do # errors.add(:base, "Must be friends to leave a comment") unless commenter.friend_of?(commentee) # end # end # # Options: # * :on - Specifies the context where this validation is active # (e.g. :on => :create or :on => :custom_validation_context) # * :allow_nil - Skip validation if attribute is +nil+. # * :allow_blank - Skip validation if attribute is blank. # * :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 validate(*args, &block) options = args.extract_options! if options.key?(:on) options = options.dup options[:if] = Array(options[:if]) options[:if].unshift("validation_context == :#{options[:on]}") end args << options set_callback(:validate, *args, &block) end # List all validators that are being used to validate the model using # +validates_with+ method. def validators _validators.values.flatten.uniq end # List all validators that are being used to validate a specific attribute. def validators_on(*attributes) attributes.map do |attribute| _validators[attribute.to_sym] end.flatten end # Check if method is an attribute method or not. def attribute_method?(attribute) method_defined?(attribute) end # Copy validators on inheritance. def inherited(base) dup = _validators.dup base._validators = dup.each { |k, v| dup[k] = v.dup } super end end # Returns the +Errors+ object that holds all information about attribute error messages. def errors @errors ||= Errors.new(self) end # Runs all the specified validations and returns true if no errors were added # otherwise false. Context can optionally be supplied to define which callbacks # to test against (the context is defined on the validations using :on). def valid?(context = nil) current_context, self.validation_context = validation_context, context errors.clear run_validations! ensure self.validation_context = current_context end # Performs the opposite of valid?. Returns true if errors were added, # false otherwise. def invalid?(context = nil) !valid?(context) end # Hook method defining how an attribute value should be retrieved. By default # this is assumed to be an instance named after the attribute. Override this # method in subclasses should you need to retrieve the value for a given # attribute differently: # # class MyClass # include ActiveModel::Validations # # def initialize(data = {}) # @data = data # end # # def read_attribute_for_validation(key) # @data[key] # end # end # alias :read_attribute_for_validation :send protected def run_validations! run_callbacks :validate errors.empty? end end end Dir[File.dirname(__FILE__) + "/validations/*.rb"].sort.each do |path| filename = File.basename(path) require "active_model/validations/#{filename}" end