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require 'active_support/core_ext/array/extract_options'
require 'active_support/core_ext/hash/keys'
require 'active_support/concern'
require 'active_support/callbacks'
module ActiveModel
module Validations
extend ActiveSupport::Concern
include ActiveSupport::Callbacks
included do
define_callbacks :validate
end
module ClassMethods
# Adds a validation method or block to the class. This is useful when
# overriding the +validate+ instance method becomes too unwieldly and
# you're looking for more descriptive declaration of your validations.
#
# This can be done with a symbol pointing to a method:
#
# class Comment < ActiveRecord::Base
# validate :must_be_friends
#
# def must_be_friends
# errors.add_to_base("Must be friends to leave a comment") unless commenter.friend_of?(commentee)
# end
# end
#
# Or with a block which is passed the current record to be validated:
#
# class Comment < ActiveRecord::Base
# validate do |comment|
# comment.must_be_friends
# end
#
# def must_be_friends
# errors.add_to_base("Must be friends to leave a comment") unless commenter.friend_of?(commentee)
# end
# end
#
# This usage applies to +validate_on_create+ and +validate_on_update as well+.
# Validates each attribute against a block.
#
# class Person < ActiveRecord::Base
# validates_each :first_name, :last_name do |record, attr, value|
# record.errors.add attr, 'starts with z.' if value[0] == ?z
# end
# end
#
# Options:
# * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
# * <tt>:allow_nil</tt> - Skip validation if attribute is +nil+.
# * <tt>:allow_blank</tt> - Skip validation if attribute is blank.
# * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
# occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The
# method, proc or string should return or evaluate to a true or false value.
# * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
# not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The
# method, proc or string should return or evaluate to a true or false value.
def validates_each(*attrs)
options = attrs.extract_options!.symbolize_keys
attrs = attrs.flatten
# Declare the validation.
send(validation_method(options[:on]), options) do |record|
attrs.each do |attr|
value = record.instance_eval { read_attribute_for_validation(attr) }
next if (value.nil? && options[:allow_nil]) || (value.blank? && options[:allow_blank])
yield record, attr, value
end
end
end
private
def validation_method(on)
:validate
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.
def valid?
errors.clear
run_callbacks(:validate)
errors.empty?
end
# Performs the opposite of <tt>valid?</tt>. Returns true if errors were added, false otherwise.
def invalid?
!valid?
end
protected
# Hook method defining how an attribute value should be retieved. 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 e.g.
# class MyClass
# include ActiveModel::Validations
#
# def initialize(data = {})
# @data = data
# end
#
# private
#
# def read_attribute_for_validation(key)
# @data[key]
# end
# end
#
def read_attribute_for_validation(key)
send(key)
end
end
end
Dir[File.dirname(__FILE__) + "/validations/*.rb"].sort.each do |path|
filename = File.basename(path)
require "active_model/validations/#{filename}"
end
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