NoMethodError in Rails when creating a new instance of model

Question

I have a model that depends from another model, I have specified it like this in my routes.rb file

Rails.application.routes.draw do
  resources :events do
    resources :guests
    get :whereabouts
  end
  devise_for :users, :controllers => { registrations: 'registrations' }

models/event.rb:

class Event < ActiveRecord::Base
  belongs_to :user
  has_many :guests
end

models/guest.rb:

class Guest < ActiveRecord::Base
  belongs_to :event
end

When I access http://localhost:3000/events/2/guests/ it works properly but when I access http://localhost:3000/events/2/guests/new I get

undefined method `guests_path' for #<#<Class:0x00000004074f78>:0x0000000aaf67c0>

from line #1 of my views/guests/_form.html.erb file which is

  <%= form_for(@guest) do |f| %>
  <% if @guest.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@guest.errors.count, "error") %> prohibited this event from being saved:</h2>
      <ul>
      <% @guest.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.text_field :first_name %>
  </div>
  <div class="field">
    <%= f.text_field :last_name %>
  </div>
  <div class="field">
    <%= f.text_field :email %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

I changed the paths to the proper ones since now guests_path should be event_guests_path, but I don't know where to change it in my form for it to work properly.

Any clue? Is my routing wrong?

coorasse · Accepted Answer · 2015-07-21 20:18:09Z

1

Your routing is correct. But the guest object depends from the event one so you have to change the form to:

<%= form_for [@event, @guest] do |f| %>
 ...
<% end %>

you must have initialized the @event variable in the controller where you probably did something like:

@event = Event.find(params[:event_id])
@guest = @event.guests.build

answered Jul 21, 2015 at 20:18

coorasse

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Jordan Running · Accepted Answer · 2015-07-21 20:16:07Z

0

From the docs:

For namespaced routes, like admin_post_url:
<%= form_for([:admin, @post]) do |f| %>
  ...
<% end %>

So, in your case, you probably want this:

<%= form_for([:event, @guest]) do |f| %>

answered Jul 21, 2015 at 20:16

Jordan Running

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