Nested Resources - UrlGenerationError - No route matches

Question

I'm working on a basic Rails app. To get things going, I created two scaffolds.

calendar
content_items

I then created the proper associations.

app/models/calendar.rb

class Calendar < ActiveRecord::Base
   has_many :content_items
end

app/models/content_item.rb

class ContentItem < ActiveRecord::Base
  belongs_to :calendar
end

routes.rb

resources :calendars do
  resources :content_items
end

However, now when I try to view the content_items of a specific calendar, I get the following error:

ActionController::UrlGenerationError - No route matches {:action=>"show", :calendar_id=>nil, :controller=>"content_items", :id=>"5"} missing required keys: [:calendar_id]

It says the error is coming from: views/content_items/index.html.erb

<td><%= link_to 'Show', calendar_content_item_path(content_item.calendar, content_item) %></td>

I've tried a few different routes, but they lead to different errors. Do I need to update the model and/or controllers since I created the nested routes?

basically rails is unable to generate a url from only content_item object. as it is nested, you also need to pass parent calender object. check [documentation](http://edgeguides.rubyonrails.org/routing.html#creating-paths-and-urls-from-objects) — Alper Karapınar, May 25 '15 at 08:25

Amit Badheka · Accepted Answer · 2015-05-25T08:34:03.230

2

Try using

<td><%= link_to 'Show', calendar_content_item_path(content_item.calendar, content_item) %></td>

edited May 25 '15 at 08:34

answered May 25 '15 at 08:28

Amit Badheka

2,677
4
19
29

Tried this. I think its closer. Updated code and error in original post. – JeremyE May 25 '15 at 08:32
Updated the answer, please check. There was a little spelling mistake :) – Amit Badheka May 25 '15 at 08:34
Updated original post again. Im confused by the error because it appears the ID is being passed in. – JeremyE May 25 '15 at 08:40
Is there any record where the is no calendar_id? Can you confirm if the association works? – Amit Badheka May 25 '15 at 08:43
Both models appear to be correct, but Im not sure of another way to check. – JeremyE May 25 '15 at 08:45
To check, just in the view, for now comment the link and display content_item.calendar instead. If u get a object, it works fine – Amit Badheka May 25 '15 at 08:46
content_item.calendar doesn't throw an error, but it has a nill value. – JeremyE May 25 '15 at 09:33
1

so it means..there are some values..which does not have calendar_id, you can put validations and it should work – Amit Badheka May 25 '15 at 09:47
That was it. I needed to clear out the database of old data that didn't have a calendar_id. I'll mark your answer as correct. Thanks for your help! – JeremyE May 25 '15 at 22:23
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/78733/discussion-between-amit-badheka-pykih-staff-and-jeremye). – Amit Badheka May 26 '15 at 04:50

alexandrine_greenfelder · Answer 2 · 2015-05-25T08:26:52.197

0

You forget to add _path suffix to route:

<td><%= link_to 'Show', content_items_path(calendar) %></td>

edited May 25 '15 at 08:26

answered May 25 '15 at 08:24

alexandrine_greenfelder

226
2
9

That leads to this: undefined local variable or method `content_item_path' – JeremyE May 25 '15 at 08:26
+ forget to use plural form: `content_items_path` – alexandrine_greenfelder May 25 '15 at 08:26
+ forget to pass `calendar` variable to identify related calendar – alexandrine_greenfelder May 25 '15 at 08:27

Nested Resources - UrlGenerationError - No route matches

2 Answers2