CODEWITHSUNDEEP
ruby-on-railsrubymongomapper
user1203803
user1203803

Reputation:

undefined method `key?' for nil:NilClass when using MongoMapper

I set up a new Rails application by following these instructions. I generated a new controller and added resources :tickets to the routes file.

Hexapoda::Application.routes.draw do
  resources :tickets
end

This is the controller (`/app/controllers/tickets_controller.rb').

class TicketsController < ApplicationController
  def index
    @tickets = Ticket.all
  end
end

I then added a new model Ticket in /app/models/ticket.rb.

class Ticket
  include MongoMapper::Document

  key :summary, String, :required => true
end

Here's the view (/app/views/index.html.erb):

<h1>Tickets#index</h1>
<p>Find me in app/views/tickets/index.html.erb</p>

Now when I go to /tickets in my browser, I get an error message.

NoMethodError in TicketsController#index

undefined method `key?' for nil:NilClass

I have no idea what's going on. What could be the problem? I'm using Rails 3.2.5 and MongoMapper 0.11.1.

Upvotes: 4

Views: 3416

Answers (3)

Merott
Merott

Reputation: 7379

This was giving me quite a bit of headache. I don't have the mongo_mapper gem installed, but restarting the rails server fixed the problem for me.

Upvotes: 0

de_an777
de_an777

Reputation: 1137

Jesse Wolgamott solution above me should work, if it doesn't, you may have something else wrong that is very simple.

For me, this error:

undefined method `key?' for nil:NilClass

happened because a model file that the controller was calling and displaying in the view had a simple typo in it. Make sure that when you use attr_accessible that you don't forget any of the commas between things. My issue came from using having new line characters like so:

attr_accessible :address_1, :address_2, :city <= COMMA NEEDED :country, :latitude, :longitude, :state, :zip

Be sure to do what Jesse Wolgamott above me said to do and if that doesn't work or if you are already running that version already, check your model files for typos.

Upvotes: 2

Jesse Wolgamott
Jesse Wolgamott

Reputation: 40277

You need the latest MonoMapper from Master:

gem 'mongo_mapper', github: "jnunemaker/mongomapper"

And run bundle

Explanation: Rails 3.2.4 added a accessible_attributes method to ActiveModel, but MongoMapper already had this; so they were clobbering each other.

MM issue: Issue 419
MM commit that fixes: 4d35c67

Upvotes: 6

Related Questions