# -*- coding: utf-8 -*-
require 'active_support/core_ext/array/wrap'
require 'active_support/core_ext/array/conversions'
require 'active_support/core_ext/string/inflections'
require 'active_support/core_ext/object/blank'
require 'active_support/core_ext/hash/reverse_merge'
require 'active_support/ordered_hash'
module ActiveModel
# == Active Model Errors
#
# Provides a modified +OrderedHash+ that you can include in your object
# for handling error messages and interacting with Action Pack 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, "can not 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 Person.human_attribute_name(attr, options = {})
# attr
# end
#
# def Person.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 ActiveModel::Translations
# you will not need to implement the last two. Likewise, using
# ActiveModel::Validations will handle the validation related methods
# for you.
#
# The above allows you to do:
#
# p = Person.new
# p.validate! # => ["can not be nil"]
# p.errors.full_messages # => ["name can not be nil"]
# # etc..
class Errors
include Enumerable
CALLBACKS_OPTIONS = [:if, :unless, :on, :allow_nil, :allow_blank]
attr_reader :messages
# 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 = ActiveSupport::OrderedHash.new
end
# Clear the messages
def clear
messages.clear
end
# Get messages for +key+
def get(key)
messages[key]
end
# Set messages for +key+ to +value+
def set(key, value)
messages[key] = value
end
# When passed a symbol or a name of a method, returns an array of errors
# for the method.
#
# p.errors[:name] # => ["can not be nil"]
# p.errors['name'] # => ["can not be nil"]
def [](attribute)
get(attribute.to_sym) || set(attribute.to_sym, [])
end
# Adds to the supplied attribute the supplied error message.
#
# p.errors[:name] = "must be set"
# p.errors[:name] # => ['must be set']
def []=(attribute, error)
self[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.
#
# p.errors.add(:name, "can't be blank")
# p.errors.each do |attribute, errors_array|
# # Will yield :name and "can't be blank"
# end
#
# p.errors.add(:name, "must be specified")
# p.errors.each do |attribute, errors_array|
# # Will yield :name and "can't be blank"
# # then yield :name and "must be specified"
# end
def each
messages.each_key do |attribute|
self[attribute].each { |error| yield attribute, error }
end
end
# Returns the number of error messages.
#
# p.errors.add(:name, "can't be blank")
# p.errors.size # => 1
# p.errors.add(:name, "must be specified")
# p.errors.size # => 2
def size
values.flatten.size
end
# Returns all message values
def values
messages.values
end
# Returns all message keys
def keys
messages.keys
end
# Returns an array of error messages, with the attribute name included
#
# p.errors.add(:name, "can't be blank")
# p.errors.add(:name, "must be specified")
# p.errors.to_a # => ["name can't be blank", "name must be specified"]
def to_a
full_messages
end
# Returns the number of error messages.
# p.errors.add(:name, "can't be blank")
# p.errors.count # => 1
# p.errors.add(:name, "must be specified")
# p.errors.count # => 2
def count
to_a.size
end
# Returns true if there are any errors, false if not.
def empty?
all? { |k, v| v && v.empty? }
end
alias_method :blank?, :empty?
# Returns an xml formatted representation of the Errors hash.
#
# p.errors.add(:name, "can't be blank")
# p.errors.add(:name, "must be specified")
# p.errors.to_xml
# # =>
# #
# #