# Views to handle a one-to-many relation? **URL:** \ **Category:** Rails\ **Created:** [June 1, 2008, 12:37pm UTC](https://www.ruby-forum.com/t/views-to-handle-a-one-to-many-relation/139188 "2008-06-01T12:37:18Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![AndrSSSSs\_MejSSS\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/90db22/32.png) [@AndrSSSSs\_MejSSS\_a](https://www.ruby-forum.com/u/AndrSSSSs_MejSSS_a)\ **Post date:** [June 1, 2008, 12:37pm UTC](https://www.ruby-forum.com/t/views-to-handle-a-one-to-many-relation/139188/1 "2008-06-01T12:37:18Z")
Hello, I have a one-to-many relation between rooms and guests. A room has\_many guests, and a guest belongs\_to a single room. I’ve got a basic view for this, where I can show a room with a list of all guests belonging to it. The problem is I can see these relations, but yet can’t add new guests to a room (The ones I see were associated via script/console). I want to show a room with all its guests and a link that lets me add new guests to it. This link should take me to a list of all “roomless” guests, where I should be able to choose some of these guests and add them to a room. I don’t know how to do this. Can you help me out? Thanks a lot for your help. Sincerely, Andrés. ---
**Author:** ![AndrSSSSs\_MejSSS\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/90db22/32.png) [@AndrSSSSs\_MejSSS\_a](https://www.ruby-forum.com/u/AndrSSSSs_MejSSS_a)\ **Post date:** [June 1, 2008, 5:37pm UTC](https://www.ruby-forum.com/t/views-to-handle-a-one-to-many-relation/139188/2 "2008-06-01T17:37:23Z")
Hi Andres, There are many ways to do this. Essentially, if you’re in the rooms/show page, (say with room’s id is 4 for the purposes of this example). The url is /rooms/show/4 Now, the room is being shown in the view, with all its guests The guests need to be links such as this: \<%= link\_to guest.name, :controller =\> ‘guests’, :action =\> ‘new’, :room\_id =\> @room.id %\> Now in the new action of the guests controller, you’d have: @guest = Guest.new(:room\_id =\> params[:room\_id]) and in the form for your guest, you’d have a hidden field \<%= hidden\_field ‘guest’, ‘room\_id’ %\> so that your guests/create action can take up the room\_id attribute when it is has @guest = Guest.new(params[:guest]) if(@guest.save) (etc.) That’s one way to do it 🙂 If you want it with your roomless guests, then your new action should actually have something like: @guests = Guest.find(params[:guest\_id]) @roomless\_guests = Guest.find(:all, :conditions =\> “room\_id IS NULL”) So that you’re not creating them, and then the links will link to some other action, which associates the id’s. \<% for guest in @guests %\> \<%= link\_to ‘associate’, :action =\> ‘associate\_guest\_to\_room’, :guest\_id =\> guest.id, :room\_id =\> @room.id %\> \<% end %\> Hope that helps, Julian. Learn Ruby on Rails! Check out the FREE VIDS (for a limited time) VIDEO #4 parts a and b now available! [http://sensei.zenunit.com/](http://sensei.zenunit.com/) ---
**Author:** ![AndrSSSSs\_MejSSS\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/90db22/32.png) [@AndrSSSSs\_MejSSS\_a](https://www.ruby-forum.com/u/AndrSSSSs_MejSSS_a)\ **Post date:** [June 2, 2008, 1:14am UTC](https://www.ruby-forum.com/t/views-to-handle-a-one-to-many-relation/139188/3 "2008-06-02T01:14:07Z")
Thanks a lot for your help, Julian. It has been very useful for me 🙂 On Sun, Jun 1, 2008 at 10:35 AM, Julian L. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)