require 'active_support/core_ext/array/extract_options' require 'active_support/core_ext/hash/keys' require 'active_support/core_ext/hash/except' 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.messages # => {first_name:["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 class_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) validates_with BlockValidator, _merge_attributes(attr_names), &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. # # class Person # include ActiveModel::Validations # # validates_with MyValidator # validates_with OtherValidator, on: :create # validates_with StrictValidator, strict: true # end # # Person.validators # # => [ # # #, # # #, # # # # # ] def validators _validators.values.flatten.uniq end # Clears all of the validators and validations. # # Note that this will clear anything that is being used to validate # the model for both the +validates_with+ and +validate+ methods. # It clears the validators that are created with an invocation of # +validates_with+ and the callbacks that are set by an invocation # of +validate+. # # class Person # include ActiveModel::Validations # # validates_with MyValidator # validates_with OtherValidator, on: :create # validates_with StrictValidator, strict: true # validate :cannot_be_robot # # def cannot_be_robot # errors.add(:base, 'A person cannot be a robot') if person_is_robot # end # end # # Person.validators # # => [ # # #, # # #, # # # # # ] # # If one runs Person.clear_validators! and then checks to see what # validators this class has, you would obtain: # # Person.validators # => [] # # Also, the callback set by +validate :cannot_be_robot+ will be erased # so that: # # Person._validate_callbacks.empty? # => true # def clear_validators! reset_callbacks(:validate) _validators.clear end # List all validators that are being used to validate a specific attribute. # # class Person # include ActiveModel::Validations # # attr_accessor :name , :age # # validates_presence_of :name # validates_inclusion_of :age, in: 0..99 # end # # Person.validators_on(:name) # # => [ # # #, # # # # # ] def validators_on(*attributes) attributes.flat_map do |attribute| _validators[attribute.to_sym] end end # Returns +true+ if +attribute+ is an attribute method, +false+ otherwise. # # class Person # include ActiveModel::Validations # # attr_accessor :name # end # # User.attribute_method?(:name) # => true # User.attribute_method?(:age) # => false def attribute_method?(attribute) method_defined?(attribute) end # Copy validators on inheritance. def inherited(base) #:nodoc: dup = _validators.dup base._validators = dup.each { |k, v| dup[k] = v.dup } super end end # Clean the +Errors+ object if instance is duped. def initialize_dup(other) #:nodoc: @errors = nil super end # Returns the +Errors+ object that holds all information about attribute # error messages. # # class Person # include ActiveModel::Validations # # attr_accessor :name # validates_presence_of :name # end # # person = Person.new # person.valid? # => false # person.errors # => # def errors @errors ||= Errors.new(self) end # Runs all the specified validations and returns +true+ if no errors were # added otherwise +false+. # # class Person # include ActiveModel::Validations # # attr_accessor :name # validates_presence_of :name # end # # person = Person.new # person.name = '' # person.valid? # => false # person.name = 'david' # person.valid? # => true # # Context can optionally be supplied to define which callbacks to test # against (the context is defined on the validations using :on). # # class Person # include ActiveModel::Validations # # attr_accessor :name # validates_presence_of :name, on: :new # end # # person = Person.new # person.valid? # => true # person.valid?(:new) # => false 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. # # class Person # include ActiveModel::Validations # # attr_accessor :name # validates_presence_of :name # end # # person = Person.new # person.name = '' # person.invalid? # => true # person.name = 'david' # person.invalid? # => false # # Context can optionally be supplied to define which callbacks to test # against (the context is defined on the validations using :on). # # class Person # include ActiveModel::Validations # # attr_accessor :name # validates_presence_of :name, on: :new # end # # person = Person.new # person.invalid? # => false # person.invalid?(:new) # => true 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! #:nodoc: run_callbacks :validate errors.empty? end end end Dir[File.dirname(__FILE__) + "/validations/*.rb"].each { |file| require file }