No route matches missing required keys: [:id]

I'm new at Rails and I've seem similar problems, but I can't solve mine.

My routes:

resources :users do resources :items end 

My models:

class Item < ActiveRecord::Base belongs_to :user end class User < ActiveRecord::Base has_many :items end 

HTML:

<% @items.each do |item| %> <tr> <td><%= item.id %></td> <td><%= item.code %></td> <td><%= item.name %></td> <td><%= item.quantity %></td> <td><%= link_to "Edit", edit_user_item_path(item) %></td> <---- error 

And I'm getting the same error:

No route matches {:action=>"edit", :controller=>"items", :user_id=>#<Item id: 1, user_id: 1, code: "123", name: "test", quantity: 12, , created_at: "2014-02-11 15:45:30", updated_at: "2014-02-11 15:45:30">, :id=>nil, :format=>nil} missing required keys: [:id] 

4 Answers

You need to include the user as well since its a nested route. So something like:

<td><%= link_to "Edit", edit_user_item_path(@user, item) %></td> 

The problem is that you are using nested resources:

resources :users do resources :items end 

So when you have a link:

<%= link_to "Edit", edit_user_item_path(item) %> 

It will lack one user_id so the easy to check the issue is using rake routes. And it will list the routes like this:

edit_user_item GET /users/:user_id/items/:id/edit(.:format) items#edit 

You can see the routes above and check it with the link, you will see it does not have user_id. That's the main reason!

The object item is being passed instead of the required id.

<td><%= link_to "Edit", edit_user_item_path(item.id) %></td> 

You've missed user_id in the following path:

edit_user_item_path(user_id, item) 

format you are able to find just running bundle exec rake routes | grep edit_user_item