Question

I had some issues with a different ODM yesterday so I decided to take a look at Mongoid instead. The wiki tutorial was pretty thorough, so it seemed like it was worth a shot. I went through the wiki article very carefully but may have missed something. Perhaps this is happening because I had a different ODM in the app yesterday. Anyway, now I’m getting an error:

uninitialized constant User::Mongoid

with this line of code (threw this in to confirm it was this method that was the issue):

<% if user_signed_in? -%>
5:     Hello user
6:     <% end -%>

user_signed_in is a Devise method. I suspect that Devise isn’t actually loading but I’m not sure what to do next.

My gem file has gem "devise", "1.5.0" and I’ve run a bundler install, I can see that devise is getting installed. I’ve confirmed that my application controller exactly matches the app controller in the sample. My app starts with no issues when I run rails server. All the models in the app load correctly when I do load 'app/models/user.rb'. The file config/initializers/devise.rb has require 'devise/orm/mongoid'. I’ve verified that my User model exactly matches the one in the tutorial.

What should I look at next?

Update: This was fixed, but I’m still missing how. I started the app on a new port. That’s all it took. I was making changes to my index.html.erb and seeing those changes in the error that I was getting so I know the new code was being seen. But when I started the app on a new port the error went away. Perhaps there’s some sort of ‘hard recompile’ in rails that I’m not aware of?

Answer 1

First, confirm that the error is still happening after you fully restart your rails instance.

I suppose that in the User model you have something like this:

class User
  include Mongoid::Document

  devise :database_authenticatable, ...
end

Check in config/initializers/devise.rb:

  # ==> ORM configuration
  # Load and configure the ORM. Supports :active_record (default) and
  # :mongoid (bson_ext recommended) by default. Other ORMs may be
  # available as additional gems.
  require 'devise/orm/mongoid'

Also check that devise gem is under mongoid gem in Gemfile:

gem "mongoid", "~> 2.3.2"
gem "bson_ext"
gem "devise", "~> 1.4.9"