How do I set up user authentication using devise and Rails 4?

Question

I'm trying to get user authentication with devise working, and failing.

I tried following the steps in the RailsGirls article, but after creating the simple new project, adding the gem 'devise' and running bundle install, but when I run rails generate devise:install I get a screenful of errors starting

Error:Get available generators script executes with errors:
Error:C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.1.1/lib/active_record/dynamic_matchers.rb:26:in `method_missing': undefined method `devise' for User (call 'User.connection' to establish a connection):Class (NoMethodError)

Has anybody any idea what I might be doing wrong? (I tried using the instructions in the devise wiki, but I couldn't get it working that way either).

What do you get with `rails -v` run in the console in the project root level? — BroiSatse, May 29 '14 at 18:56
@BroiSatse Yes, Rails 4.0.2 and Ruby 1.9.3. I followed the instructions in Agile Web Development with Rails 4, although I don't know how that gave me Rails 4.0.2... — digitig, May 29 '14 at 19:08
Add please config/routes.rb and app/models/user.rb to your first post. — Pavel Volzhin, May 29 '14 at 19:41
Getting this EXACT error without adding `gem 'devise'` to my gem file — Bot, Jun 12 '14 at 23:51

score 1 · Answer 1 · answered Jun 03 '14 at 16:38

I just ran to this same problem today, it's because you tried to generate the model before you tried to install devise it self

Stash ( or remove ) the changes for the user model and any migration file, then run this

rails generate devise:install

after that unstash and apply the migration, it should work just fine.

How do I set up user authentication using devise and Rails 4?

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