# Validation of acts\_as\_list in the model of the base class? **URL:** \ **Category:** Rails\ **Created:** [December 28, 2007, 5:57am UTC](https://www.ruby-forum.com/t/validation-of-acts-as-list-in-the-model-of-the-base-class/124377 "2007-12-28T05:57:39Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Mukund](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/e8c25b/32.png) [@Mukund](https://www.ruby-forum.com/u/Mukund)\ **Post date:** [December 28, 2007, 5:57am UTC](https://www.ruby-forum.com/t/validation-of-acts-as-list-in-the-model-of-the-base-class/124377/1 "2007-12-28T05:57:39Z")
Lets say I have 3 models, user, user\_group and user\_group\_nodes. A normal user has one user\_group\_id as a foreign key and a special user has multiple user\_groups which are defined in the user\_group\_nodes. The user\_group\_nodes is a “acts\_as\_list” for user and contains a list of group\_ids. When I build a form to get user input and I want to save it, is there a way to validate the presence of the child nodes in the model of “user” so that I can permit the user to be saved only if the child nodes are validated? I also wanted to use the errors\_on etc. which are accessible only at the model level. ---
**Author:** ![Mukund](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/e8c25b/32.png) [@Mukund](https://www.ruby-forum.com/u/Mukund)\ **Post date:** [December 28, 2007, 6:00am UTC](https://www.ruby-forum.com/t/validation-of-acts-as-list-in-the-model-of-the-base-class/124377/2 "2007-12-28T06:00:35Z")
I think what you’re looking for is validates\_associated :user\_group\_nodes. On Dec 28, 2007 3:27 PM, Mukund [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > nodes are validated? I also wanted to use the errors\_on etc. which > are accessible only at the model level. > > > – Ryan B. > **[frozenplague.net](http://www.frozenplague.net)** > > This domain may be for sale! Feel free to add me to MSN and/or GTalk as this email.