I'm having a hard time with the Paperclip gem. I'm trying to upload a picture as an avatar for my user. Everytime I upload, it will get the file and store it in the User DB table. I'm trying to get my simple form to go through `action='/users/<%=session[:user_id]%>'`, which then will go through `user#update` (which then will update my users picture), but it just gives me an error:

```
`undefined local variable or method `update_users_path' for '

```

```
form_for @user, :url => update_users_path, :method => patch, :html => {:multipart => true} do |f| %>
    <%= f.label :avatar %>
    <%= f.file_field :avatar %>
    <div class="form-action">
        <%= f.submit :submit %>
    </div>
<% end %>

```

I tried to do it without Simple Form, but I need multipart to be true in order to pass back the file.