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Diffstat (limited to 'activemodel/lib/active_model/errors.rb')
| -rw-r--r-- | activemodel/lib/active_model/errors.rb | 517 |
1 files changed, 517 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/errors.rb b/activemodel/lib/active_model/errors.rb new file mode 100644 index 0000000000..4726a68f69 --- /dev/null +++ b/activemodel/lib/active_model/errors.rb @@ -0,0 +1,517 @@ +require 'active_support/core_ext/array/conversions' +require 'active_support/core_ext/string/inflections' +require 'active_support/core_ext/object/deep_dup' +require 'active_support/core_ext/string/filters' + +module ActiveModel + # == Active \Model \Errors + # + # Provides a modified +Hash+ that you can include in your object + # for handling error messages and interacting with Action View helpers. + # + # A minimal implementation could be: + # + # class Person + # # Required dependency for ActiveModel::Errors + # extend ActiveModel::Naming + # + # def initialize + # @errors = ActiveModel::Errors.new(self) + # end + # + # attr_accessor :name + # attr_reader :errors + # + # def validate! + # errors.add(:name, :blank, message: "cannot be nil") if name.nil? + # end + # + # # The following methods are needed to be minimally implemented + # + # def read_attribute_for_validation(attr) + # send(attr) + # end + # + # def self.human_attribute_name(attr, options = {}) + # attr + # end + # + # def self.lookup_ancestors + # [self] + # end + # end + # + # The last three methods are required in your object for +Errors+ to be + # able to generate error messages correctly and also handle multiple + # languages. Of course, if you extend your object with <tt>ActiveModel::Translation</tt> + # you will not need to implement the last two. Likewise, using + # <tt>ActiveModel::Validations</tt> will handle the validation related methods + # for you. + # + # The above allows you to do: + # + # person = Person.new + # person.validate! # => ["cannot be nil"] + # person.errors.full_messages # => ["name cannot be nil"] + # # etc.. + class Errors + include Enumerable + + CALLBACKS_OPTIONS = [:if, :unless, :on, :allow_nil, :allow_blank, :strict] + MESSAGE_OPTIONS = [:message] + + attr_reader :messages, :details + + # Pass in the instance of the object that is using the errors object. + # + # class Person + # def initialize + # @errors = ActiveModel::Errors.new(self) + # end + # end + def initialize(base) + @base = base + @messages = Hash.new { |messages, attribute| messages[attribute] = [] } + @details = Hash.new { |details, attribute| details[attribute] = [] } + end + + def initialize_dup(other) # :nodoc: + @messages = other.messages.dup + @details = other.details.deep_dup + super + end + + # Clear the error messages. + # + # person.errors.full_messages # => ["name cannot be nil"] + # person.errors.clear + # person.errors.full_messages # => [] + def clear + messages.clear + details.clear + end + + # Returns +true+ if the error messages include an error for the given key + # +attribute+, +false+ otherwise. + # + # person.errors.messages # => {:name=>["cannot be nil"]} + # person.errors.include?(:name) # => true + # person.errors.include?(:age) # => false + def include?(attribute) + messages[attribute].present? + end + alias :has_key? :include? + alias :key? :include? + + # Get messages for +key+. + # + # person.errors.messages # => {:name=>["cannot be nil"]} + # person.errors.get(:name) # => ["cannot be nil"] + # person.errors.get(:age) # => [] + def get(key) + ActiveSupport::Deprecation.warn(<<-MESSAGE.squish) + ActiveModel::Errors#get is deprecated and will be removed in Rails 5.1. + + To achieve the same use model.errors[:#{key}]. + MESSAGE + + messages[key] + end + + # Set messages for +key+ to +value+. + # + # person.errors[:name] # => ["cannot be nil"] + # person.errors.set(:name, ["can't be nil"]) + # person.errors[:name] # => ["can't be nil"] + def set(key, value) + ActiveSupport::Deprecation.warn(<<-MESSAGE.squish) + ActiveModel::Errors#set is deprecated and will be removed in Rails 5.1. + + Use model.errors.add(:#{key}, #{value.inspect}) instead. + MESSAGE + + messages[key] = value + end + + # Delete messages for +key+. Returns the deleted messages. + # + # person.errors[:name] # => ["cannot be nil"] + # person.errors.delete(:name) # => ["cannot be nil"] + # person.errors[:name] # => [] + def delete(key) + details.delete(key) + messages.delete(key) + end + + # When passed a symbol or a name of a method, returns an array of errors + # for the method. + # + # person.errors[:name] # => ["cannot be nil"] + # person.errors['name'] # => ["cannot be nil"] + def [](attribute) + messages[attribute.to_sym] + end + + # Adds to the supplied attribute the supplied error message. + # + # person.errors[:name] = "must be set" + # person.errors[:name] # => ['must be set'] + def []=(attribute, error) + ActiveSupport::Deprecation.warn(<<-MESSAGE.squish) + ActiveModel::Errors#[]= is deprecated and will be removed in Rails 5.1. + + Use model.errors.add(:#{attribute}, #{error.inspect}) instead. + MESSAGE + + messages[attribute.to_sym] << error + end + + # Iterates through each error key, value pair in the error messages hash. + # Yields the attribute and the error for that attribute. If the attribute + # has more than one error message, yields once for each error message. + # + # person.errors.add(:name, :blank, message: "can't be blank") + # person.errors.each do |attribute, error| + # # Will yield :name and "can't be blank" + # end + # + # person.errors.add(:name, :not_specified, message: "must be specified") + # person.errors.each do |attribute, error| + # # Will yield :name and "can't be blank" + # # then yield :name and "must be specified" + # end + def each + messages.each_key do |attribute| + messages[attribute].each { |error| yield attribute, error } + end + end + + # Returns the number of error messages. + # + # person.errors.add(:name, :blank, message: "can't be blank") + # person.errors.size # => 1 + # person.errors.add(:name, :not_specified, message: "must be specified") + # person.errors.size # => 2 + def size + values.flatten.size + end + alias :count :size + + # Returns all message values. + # + # person.errors.messages # => {:name=>["cannot be nil", "must be specified"]} + # person.errors.values # => [["cannot be nil", "must be specified"]] + def values + messages.values + end + + # Returns all message keys. + # + # person.errors.messages # => {:name=>["cannot be nil", "must be specified"]} + # person.errors.keys # => [:name] + def keys + messages.keys + end + + # Returns +true+ if no errors are found, +false+ otherwise. + # If the error message is a string it can be empty. + # + # person.errors.full_messages # => ["name cannot be nil"] + # person.errors.empty? # => false + def empty? + size.zero? + end + alias :blank? :empty? + + # Returns an xml formatted representation of the Errors hash. + # + # person.errors.add(:name, :blank, message: "can't be blank") + # person.errors.add(:name, :not_specified, message: "must be specified") + # person.errors.to_xml + # # => + # # <?xml version=\"1.0\" encoding=\"UTF-8\"?> + # # <errors> + # # <error>name can't be blank</error> + # # <error>name must be specified</error> + # # </errors> + def to_xml(options={}) + to_a.to_xml({ root: "errors", skip_types: true }.merge!(options)) + end + + # Returns a Hash that can be used as the JSON representation for this + # object. You can pass the <tt>:full_messages</tt> option. This determines + # if the json object should contain full messages or not (false by default). + # + # person.errors.as_json # => {:name=>["cannot be nil"]} + # person.errors.as_json(full_messages: true) # => {:name=>["name cannot be nil"]} + def as_json(options=nil) + to_hash(options && options[:full_messages]) + end + + # Returns a Hash of attributes with their error messages. If +full_messages+ + # is +true+, it will contain full messages (see +full_message+). + # + # person.errors.to_hash # => {:name=>["cannot be nil"]} + # person.errors.to_hash(true) # => {:name=>["name cannot be nil"]} + def to_hash(full_messages = false) + if full_messages + self.messages.each_with_object({}) do |(attribute, array), messages| + messages[attribute] = array.map { |message| full_message(attribute, message) } + end + else + self.messages.dup + end + end + + # Adds +message+ to the error messages and used validator type to +details+ on +attribute+. + # More than one error can be added to the same +attribute+. + # If no +message+ is supplied, <tt>:invalid</tt> is assumed. + # + # person.errors.add(:name) + # # => ["is invalid"] + # person.errors.add(:name, :not_implemented, message: "must be implemented") + # # => ["is invalid", "must be implemented"] + # + # person.errors.messages + # # => {:name=>["is invalid", "must be implemented"]} + # + # person.errors.details + # # => {:name=>[{error: :not_implemented}, {error: :invalid}]} + # + # If +message+ is a symbol, it will be translated using the appropriate + # scope (see +generate_message+). + # + # If +message+ is a proc, it will be called, allowing for things like + # <tt>Time.now</tt> to be used within an error. + # + # If the <tt>:strict</tt> option is set to +true+, it will raise + # ActiveModel::StrictValidationFailed instead of adding the error. + # <tt>:strict</tt> option can also be set to any other exception. + # + # person.errors.add(:name, :invalid, strict: true) + # # => ActiveModel::StrictValidationFailed: name is invalid + # person.errors.add(:name, :invalid, strict: NameIsInvalid) + # # => NameIsInvalid: name is invalid + # + # person.errors.messages # => {} + # + # +attribute+ should be set to <tt>:base</tt> if the error is not + # directly associated with a single attribute. + # + # person.errors.add(:base, :name_or_email_blank, + # message: "either name or email must be present") + # person.errors.messages + # # => {:base=>["either name or email must be present"]} + # person.errors.details + # # => {:base=>[{error: :name_or_email_blank}]} + def add(attribute, message = :invalid, options = {}) + message = message.call if message.respond_to?(:call) + detail = normalize_detail(attribute, message, options) + message = normalize_message(attribute, message, options) + if exception = options[:strict] + exception = ActiveModel::StrictValidationFailed if exception == true + raise exception, full_message(attribute, message) + end + + details[attribute.to_sym] << detail + messages[attribute.to_sym] << message + end + + # Will add an error message to each of the attributes in +attributes+ + # that is empty. + # + # person.errors.add_on_empty(:name) + # person.errors.messages + # # => {:name=>["can't be empty"]} + def add_on_empty(attributes, options = {}) + ActiveSupport::Deprecation.warn(<<-MESSAGE.squish) + ActiveModel::Errors#add_on_empty is deprecated and will be removed in Rails 5.1 + + To achieve the same use: + + errors.add(attribute, :empty, options) if value.nil? || value.empty? + MESSAGE + + Array(attributes).each do |attribute| + value = @base.send(:read_attribute_for_validation, attribute) + is_empty = value.respond_to?(:empty?) ? value.empty? : false + add(attribute, :empty, options) if value.nil? || is_empty + end + end + + # Will add an error message to each of the attributes in +attributes+ that + # is blank (using Object#blank?). + # + # person.errors.add_on_blank(:name) + # person.errors.messages + # # => {:name=>["can't be blank"]} + def add_on_blank(attributes, options = {}) + ActiveSupport::Deprecation.warn(<<-MESSAGE.squish) + ActiveModel::Errors#add_on_blank is deprecated and will be removed in Rails 5.1 + + To achieve the same use: + + errors.add(attribute, :empty, options) if value.blank? + MESSAGE + + Array(attributes).each do |attribute| + value = @base.send(:read_attribute_for_validation, attribute) + add(attribute, :blank, options) if value.blank? + end + end + + # Returns +true+ if an error on the attribute with the given message is + # present, +false+ otherwise. +message+ is treated the same as for +add+. + # + # person.errors.add :name, :blank + # person.errors.added? :name, :blank # => true + def added?(attribute, message = :invalid, options = {}) + message = message.call if message.respond_to?(:call) + message = normalize_message(attribute, message, options) + self[attribute].include? message + end + + # Returns all the full error messages in an array. + # + # class Person + # validates_presence_of :name, :address, :email + # validates_length_of :name, in: 5..30 + # end + # + # person = Person.create(address: '123 First St.') + # person.errors.full_messages + # # => ["Name is too short (minimum is 5 characters)", "Name can't be blank", "Email can't be blank"] + def full_messages + map { |attribute, message| full_message(attribute, message) } + end + alias :to_a :full_messages + + # Returns all the full error messages for a given attribute in an array. + # + # class Person + # validates_presence_of :name, :email + # validates_length_of :name, in: 5..30 + # end + # + # person = Person.create() + # person.errors.full_messages_for(:name) + # # => ["Name is too short (minimum is 5 characters)", "Name can't be blank"] + def full_messages_for(attribute) + messages[attribute].map { |message| full_message(attribute, message) } + end + + # Returns a full message for a given attribute. + # + # person.errors.full_message(:name, 'is invalid') # => "Name is invalid" + def full_message(attribute, message) + return message if attribute == :base + attr_name = attribute.to_s.tr('.', '_').humanize + attr_name = @base.class.human_attribute_name(attribute, default: attr_name) + I18n.t(:"errors.format", { + default: "%{attribute} %{message}", + attribute: attr_name, + message: message + }) + end + + # Translates an error message in its default scope + # (<tt>activemodel.errors.messages</tt>). + # + # Error messages are first looked up in <tt>activemodel.errors.models.MODEL.attributes.ATTRIBUTE.MESSAGE</tt>, + # if it's not there, it's looked up in <tt>activemodel.errors.models.MODEL.MESSAGE</tt> and if + # that is not there also, it returns the translation of the default message + # (e.g. <tt>activemodel.errors.messages.MESSAGE</tt>). The translated model + # name, translated attribute name and the value are available for + # interpolation. + # + # When using inheritance in your models, it will check all the inherited + # models too, but only if the model itself hasn't been found. Say you have + # <tt>class Admin < User; end</tt> and you wanted the translation for + # the <tt>:blank</tt> error message for the <tt>title</tt> attribute, + # it looks for these translations: + # + # * <tt>activemodel.errors.models.admin.attributes.title.blank</tt> + # * <tt>activemodel.errors.models.admin.blank</tt> + # * <tt>activemodel.errors.models.user.attributes.title.blank</tt> + # * <tt>activemodel.errors.models.user.blank</tt> + # * any default you provided through the +options+ hash (in the <tt>activemodel.errors</tt> scope) + # * <tt>activemodel.errors.messages.blank</tt> + # * <tt>errors.attributes.title.blank</tt> + # * <tt>errors.messages.blank</tt> + def generate_message(attribute, type = :invalid, options = {}) + type = options.delete(:message) if options[:message].is_a?(Symbol) + + if @base.class.respond_to?(:i18n_scope) + defaults = @base.class.lookup_ancestors.map do |klass| + [ :"#{@base.class.i18n_scope}.errors.models.#{klass.model_name.i18n_key}.attributes.#{attribute}.#{type}", + :"#{@base.class.i18n_scope}.errors.models.#{klass.model_name.i18n_key}.#{type}" ] + end + else + defaults = [] + end + + defaults << :"#{@base.class.i18n_scope}.errors.messages.#{type}" if @base.class.respond_to?(:i18n_scope) + defaults << :"errors.attributes.#{attribute}.#{type}" + defaults << :"errors.messages.#{type}" + + defaults.compact! + defaults.flatten! + + key = defaults.shift + defaults = options.delete(:message) if options[:message] + value = (attribute != :base ? @base.send(:read_attribute_for_validation, attribute) : nil) + + options = { + default: defaults, + model: @base.model_name.human, + attribute: @base.class.human_attribute_name(attribute), + value: value + }.merge!(options) + + I18n.translate(key, options) + end + + private + def normalize_message(attribute, message, options) + case message + when Symbol + generate_message(attribute, message, options.except(*CALLBACKS_OPTIONS)) + else + message + end + end + + def normalize_detail(attribute, message, options) + { error: message }.merge(options.except(*CALLBACKS_OPTIONS + MESSAGE_OPTIONS)) + end + end + + # Raised when a validation cannot be corrected by end users and are considered + # exceptional. + # + # class Person + # include ActiveModel::Validations + # + # attr_accessor :name + # + # validates_presence_of :name, strict: true + # end + # + # person = Person.new + # person.name = nil + # person.valid? + # # => ActiveModel::StrictValidationFailed: Name can't be blank + class StrictValidationFailed < StandardError + end + + # Raised when unknown attributes are supplied via mass assignment. + class UnknownAttributeError < NoMethodError + attr_reader :record, :attribute + + def initialize(record, attribute) + @record = record + @attribute = attribute + super("unknown attribute '#{attribute}' for #{@record.class}.") + end + end +end |