Question

So I have two models & controllers. Projects and Designers.

In my designers index view, I want it to show a list of all the projects that the designer has.

However, when I do a simple query like this:

<% @projects.each do |project| %>
  <tr>
    <td><%= link_to 'Show', project %></td>
    <td><%= link_to 'Edit', edit_project_path(project) %></td>
    <td><%= link_to 'Destroy', project, :confirm => 'Are you sure?', :method => :delete %></td>
  </tr>
<% end %>

From the index.html.erb in the Designers view, it gives me the following error:

NoMethodError in Designers#index
You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.each

However, when I run that EXACT code from the index.html.erb file in the projects view, it works perfectly.

So how am I able to access that controller or at least data from the view of another controller? Do I have to add a projects variable (where it queries the db) to my index object in my designers controller?

Thanks.

Answer 1

UPDATED TO USE A SINGLE DESIGNER RECORD

You should use associations. Add this to your models.

class Designer < ActiveRecord::Base
  has_many :projects
end

class Project < ActiveRecord::Base
  belongs_to :designer
end

Your view should look like this:

<% @designer.projects.each do |project| %>  

<% end %>

More info on associations here:
http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html