Rails has-and-belongs-to-many form question

Posted by swilliams on Stack Overflow See other posts from Stack Overflow or by swilliams
Published on 2010-06-14T17:25:14Z Indexed on 2010/06/14 20:42 UTC
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Sorry for the semi-generic title, but I'm still pretty new at rails and couldn't think of a succinct way to put the question.

I have a basic habtm model setup: a Project has many Resources and a Resource can have many Projects. I have the database and models setup properly, and can do everything I need to via the console, but I'm having trouble translating it all into the view.

On the show view for the Project, I want to be able to create a Resource and automatically assign it to the current Project. Here's my basic html:

<p>
  <b>Name:</b>
  <%=h @project.name %>
</p>

<h2>Equipment</h2>
<ul>
  <% @project.resources.each do |r| %>
    <li><%=h r.name %></li>
  <% end %>
</ul>
<h2>Add A Resource</h2>
<% form_for(@project) do |f| %>
  <%= f.error_messages %>

  <p>
    Resource Name:<br />
    <%= f.text_field :resources %>
  </p>
  <p>
    <%= f.submit 'Create' %>
  </p>
<% end %>

Obviously, that form won't work, but I'm at a loss for what to do next. I've searched around for various examples, but haven't found one for what I'm trying to do here.

One thing I've thought of was to change the form to be form_for(Resource.new) and include a hidden input of the @project.id. And then when the resource_controller handles the form, check for that id and go from there. That seems like an ugly kludge though.

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