diff options
Diffstat (limited to 'activerecord/lib')
-rwxr-xr-x | activerecord/lib/active_record/validations.rb | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/validations.rb b/activerecord/lib/active_record/validations.rb index 1da73d6dc5..d4f75052d3 100755 --- a/activerecord/lib/active_record/validations.rb +++ b/activerecord/lib/active_record/validations.rb @@ -271,6 +271,39 @@ module ActiveRecord end end end + + # Validates whether the associated object or objects are all themselves valid. Works with any kind of assocation. + # + # class Book < ActiveRecord::Base + # has_many :pages + # belongs_to :library + # + # validates_associated :pages, :library + # end + # + # Warning: If, after the above definition, you then wrote: + # + # class Page < ActiveRecord::Base + # belongs_to :book + # + # validates_associated :book + # end + # + # this would specify a circular dependency and cause infinite recursion. The Rails team recommends against this practice. + # + # Configuration options: + # * <tt>on</tt> Specifies when this validation is active (default is :save, other options :create, :update) + def validates_associated(*attr_names) + configuration = { :message => ActiveRecord::Errors.default_error_messages[:invalid], :on => :save } + configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash) + + for attr_name in attr_names + class_eval(%(#{validation_method(configuration[:on])} %{ + errors.add("#{attr_name}", "#{configuration[:message]}") unless + (#{attr_name}.is_a?(Array) ? #{attr_name} : [#{attr_name}]).inject(true){ |memo, record| memo and (record.nil? or record.valid?) } + })) + end + end private |