295 lines
10 KiB
Ruby
295 lines
10 KiB
Ruby
# -*- coding: utf-8 -*-
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require 'active_support/core_ext/array/wrap'
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require 'active_support/core_ext/array/conversions'
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require 'active_support/core_ext/string/inflections'
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require 'active_support/core_ext/object/blank'
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require 'active_support/core_ext/hash/reverse_merge'
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require 'active_support/ordered_hash'
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module ActiveModel
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# == Active Model Errors
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#
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# Provides a modified +OrderedHash+ that you can include in your object
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# for handling error messages and interacting with Action Pack helpers.
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#
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# A minimal implementation could be:
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#
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# class Person
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#
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# # Required dependency for ActiveModel::Errors
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# extend ActiveModel::Naming
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#
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# def initialize
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# @errors = ActiveModel::Errors.new(self)
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# end
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#
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# attr_accessor :name
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# attr_reader :errors
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#
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# def validate!
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# errors.add(:name, "can not be nil") if name == nil
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# end
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#
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# # The following methods are needed to be minimally implemented
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#
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# def read_attribute_for_validation(attr)
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# send(attr)
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# end
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#
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# def Person.human_attribute_name(attr, options = {})
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# attr
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# end
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#
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# def Person.lookup_ancestors
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# [self]
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# end
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#
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# end
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#
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# The last three methods are required in your object for Errors to be
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# able to generate error messages correctly and also handle multiple
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# languages. Of course, if you extend your object with ActiveModel::Translations
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# you will not need to implement the last two. Likewise, using
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# ActiveModel::Validations will handle the validation related methods
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# for you.
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#
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# The above allows you to do:
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#
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# p = Person.new
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# p.validate! # => ["can not be nil"]
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# p.errors.full_messages # => ["name can not be nil"]
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# # etc..
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class Errors < ActiveSupport::OrderedHash
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CALLBACKS_OPTIONS = [:if, :unless, :on, :allow_nil, :allow_blank]
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# Pass in the instance of the object that is using the errors object.
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#
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# class Person
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# def initialize
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# @errors = ActiveModel::Errors.new(self)
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# end
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# end
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def initialize(base)
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@base = base
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super()
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end
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alias_method :get, :[]
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alias_method :set, :[]=
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# When passed a symbol or a name of a method, returns an array of errors
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# for the method.
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#
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# p.errors[:name] # => ["can not be nil"]
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# p.errors['name'] # => ["can not be nil"]
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def [](attribute)
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get(attribute.to_sym) || set(attribute.to_sym, [])
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end
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# Adds to the supplied attribute the supplied error message.
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#
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# p.errors[:name] = "must be set"
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# p.errors[:name] # => ['must be set']
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def []=(attribute, error)
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self[attribute.to_sym] << error
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end
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# Iterates through each error key, value pair in the error messages hash.
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# Yields the attribute and the error for that attribute. If the attribute
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# has more than one error message, yields once for each error message.
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#
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# p.errors.add(:name, "can't be blank")
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# p.errors.each do |attribute, errors_array|
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# # Will yield :name and "can't be blank"
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# end
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#
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# p.errors.add(:name, "must be specified")
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# p.errors.each do |attribute, errors_array|
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# # Will yield :name and "can't be blank"
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# # then yield :name and "must be specified"
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# end
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def each
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each_key do |attribute|
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self[attribute].each { |error| yield attribute, error }
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end
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end
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# Returns the number of error messages.
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#
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# p.errors.add(:name, "can't be blank")
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# p.errors.size # => 1
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# p.errors.add(:name, "must be specified")
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# p.errors.size # => 2
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def size
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values.flatten.size
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end
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# Returns an array of error messages, with the attribute name included
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#
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# p.errors.add(:name, "can't be blank")
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# p.errors.add(:name, "must be specified")
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# p.errors.to_a # => ["name can't be blank", "name must be specified"]
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def to_a
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full_messages
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end
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# Returns the number of error messages.
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# p.errors.add(:name, "can't be blank")
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# p.errors.count # => 1
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# p.errors.add(:name, "must be specified")
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# p.errors.count # => 2
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def count
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to_a.size
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end
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# Returns true if there are any errors, false if not.
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def empty?
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all? { |k, v| v && v.empty? }
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end
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# Returns an xml formatted representation of the Errors hash.
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#
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# p.errors.add(:name, "can't be blank")
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# p.errors.add(:name, "must be specified")
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# p.errors.to_xml
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# # =>
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# # <?xml version=\"1.0\" encoding=\"UTF-8\"?>
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# # <errors>
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# # <error>name can't be blank</error>
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# # <error>name must be specified</error>
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# # </errors>
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def to_xml(options={})
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to_a.to_xml options.reverse_merge(:root => "errors", :skip_types => true)
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end
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# Returns an ActiveSupport::OrderedHash that can be used as the JSON representation for this object.
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def as_json(options=nil)
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self
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end
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# Adds +message+ to the error messages on +attribute+, which will be returned on a call to
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# <tt>on(attribute)</tt> for the same attribute. More than one error can be added to the same
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# +attribute+ in which case an array will be returned on a call to <tt>on(attribute)</tt>.
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# If no +message+ is supplied, <tt>:invalid</tt> is assumed.
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#
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# If +message+ is a symbol, it will be translated using the appropriate scope (see +translate_error+).
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# If +message+ is a proc, it will be called, allowing for things like <tt>Time.now</tt> to be used within an error.
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def add(attribute, message = nil, options = {})
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message ||= :invalid
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if message.is_a?(Symbol)
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message = generate_message(attribute, message, options.except(*CALLBACKS_OPTIONS))
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elsif message.is_a?(Proc)
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message = message.call
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end
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self[attribute] << message
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end
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# Will add an error message to each of the attributes in +attributes+ that is empty.
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def add_on_empty(attributes, options = {})
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[attributes].flatten.each do |attribute|
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value = @base.send(:read_attribute_for_validation, attribute)
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is_empty = value.respond_to?(:empty?) ? value.empty? : false
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add(attribute, :empty, options) if value.nil? || is_empty
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end
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end
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# Will add an error message to each of the attributes in +attributes+ that is blank (using Object#blank?).
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def add_on_blank(attributes, options = {})
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[attributes].flatten.each do |attribute|
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value = @base.send(:read_attribute_for_validation, attribute)
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add(attribute, :blank, options) if value.blank?
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end
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end
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# Returns all the full error messages in an array.
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#
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# class Company
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# validates_presence_of :name, :address, :email
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# validates_length_of :name, :in => 5..30
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# end
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#
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# company = Company.create(:address => '123 First St.')
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# company.errors.full_messages # =>
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# ["Name is too short (minimum is 5 characters)", "Name can't be blank", "Address can't be blank"]
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def full_messages
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full_messages = []
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each do |attribute, messages|
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messages = Array.wrap(messages)
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next if messages.empty?
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if attribute == :base
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messages.each {|m| full_messages << m }
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else
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attr_name = attribute.to_s.gsub('.', '_').humanize
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attr_name = @base.class.human_attribute_name(attribute, :default => attr_name)
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options = { :default => "%{attribute} %{message}", :attribute => attr_name }
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messages.each do |m|
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full_messages << I18n.t(:"errors.format", options.merge(:message => m))
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end
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end
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end
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full_messages
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end
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# Translates an error message in its default scope
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# (<tt>activemodel.errors.messages</tt>).
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#
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# Error messages are first looked up in <tt>models.MODEL.attributes.ATTRIBUTE.MESSAGE</tt>,
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# if it's not there, it's looked up in <tt>models.MODEL.MESSAGE</tt> and if that is not
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# there also, it returns the translation of the default message
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# (e.g. <tt>activemodel.errors.messages.MESSAGE</tt>). The translated model name,
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# translated attribute name and the value are available for interpolation.
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#
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# When using inheritance in your models, it will check all the inherited
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# models too, but only if the model itself hasn't been found. Say you have
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# <tt>class Admin < User; end</tt> and you wanted the translation for
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# the <tt>:blank</tt> error +message+ for the <tt>title</tt> +attribute+,
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# it looks for these translations:
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#
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# <ol>
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# <li><tt>activemodel.errors.models.admin.attributes.title.blank</tt></li>
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# <li><tt>activemodel.errors.models.admin.blank</tt></li>
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# <li><tt>activemodel.errors.models.user.attributes.title.blank</tt></li>
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# <li><tt>activemodel.errors.models.user.blank</tt></li>
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# <li>any default you provided through the +options+ hash (in the activemodel.errors scope)</li>
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# <li><tt>activemodel.errors.messages.blank</tt></li>
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# <li><tt>errors.attributes.title.blank</tt></li>
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# <li><tt>errors.messages.blank</tt></li>
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# </ol>
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def generate_message(attribute, type = :invalid, options = {})
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type = options.delete(:message) if options[:message].is_a?(Symbol)
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defaults = @base.class.lookup_ancestors.map do |klass|
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[ :"#{@base.class.i18n_scope}.errors.models.#{klass.model_name.i18n_key}.attributes.#{attribute}.#{type}",
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:"#{@base.class.i18n_scope}.errors.models.#{klass.model_name.i18n_key}.#{type}" ]
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end
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defaults << options.delete(:message)
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defaults << :"#{@base.class.i18n_scope}.errors.messages.#{type}"
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defaults << :"errors.attributes.#{attribute}.#{type}"
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defaults << :"errors.messages.#{type}"
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defaults.compact!
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defaults.flatten!
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key = defaults.shift
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value = (attribute != :base ? @base.send(:read_attribute_for_validation, attribute) : nil)
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options = {
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:default => defaults,
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:model => @base.class.model_name.human,
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:attribute => @base.class.human_attribute_name(attribute),
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:value => value
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}.merge(options)
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I18n.translate(key, options)
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end
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end
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end
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