undefined method `devise_for' in rails

Question

After I install devise and create a user model. I rake db:migrate and then I rake routes. I then get a error with "undefined method `devise_for' for #". What could be causing this error?

Have you added devise to your Gemfile? Can you check if `devise` is present in your Gemfile.lock too? — Dogbert, Jan 26 '11 at 22:49
my gem file says gem 'devise', :git => 'git://github.com/plataformatec/devise.git' — Yeddie, Jan 26 '11 at 23:00
Based on the steps you mentioned, you will get this error if you don't have a `devise.rb` under `config/initializers` — Americo Savinon, Mar 23 '23 at 09:03

score 280 · Answer 1 · answered Jan 29 '11 at 16:38

280

Remember to restart your rails server after installing and configuring devise.

answered Jan 29 '11 at 16:38

Serge Paquet

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When in doubt, restart the server. – Rishi Jul 10 '14 at 20:22
Also comment out `devise_for :installs` in `routes.rb` – Joe Essey Dec 11 '18 at 00:22
I wish the Rails server could watch files and auto-reload. Wasteful, yes, but it'd be damn convenient during development! – ankush981 Apr 22 '20 at 21:31

score 8 · Answer 2 · answered Feb 10 '12 at 18:47

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If you have the Devise gem specified in the Gemfile, just make sure you have the following in your routes.rb file:

 devise_for :users

Also, here's a trick to make sure Devise is mapped properly, run: rails c, (the Rails app console) in your app's folder and then the following command line:

 Devise.mappings.keys

You should see:

=> [:user]

Cheers!

answered Feb 10 '12 at 18:47

Florin

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Hi Florin, thanks for your answer. I have "devise_for :users" line on my routes file, however when I run Devise.mappings.keys I got an error. How should I fix this? – CanCeylan Jan 03 '15 at 14:50
Hi there - care to specify the error, unless you already found the solution?! – Florin Jan 04 '15 at 16:21

score 2 · Answer 3 · answered Feb 05 '11 at 01:21

Honestly, I would recommend following these two Railscasts (Episode 209 and Episode 210). The first is a simple and very easy walkthrough for installing Devise and the second is about customizing it to fit your application.

I've watched both episodes and they drastically helped me with Devise, particularly with the customization.

Your best bet is to start from scratch - you'll learn a heck of a lot and have Devise fully installed and functional.

Hope this helps! Good luck.

score 0 · Answer 4 · answered Jan 27 '11 at 08:35

0

You may need to do a bundle install

answered Jan 27 '11 at 08:35

Rishav Rastogi

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undefined method `devise_for' in rails

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