Error running rails generate devise User

Question

Hey I am new to rails and I am getting this error whenever I try to run

rails generate devise User

I get this error in there terminal:

/usr/local/rvm/gems/ruby-1.9.3-p392/gems/railties-4.0.0.rc2/lib/rails/application/routes_reloader.rb:10:in `rescue in execute_if_updated': Rails::Application::RoutesReloader#execute_if_updated delegated to updater.execute_if_updated, but updater is nil: #<Rails::Application::RoutesReloader:0x007fcad64c5e20 @paths=["/Users/DavidStevenson/Desktop/omrails/omrails/config/routes.rb"], @route_sets=[#<ActionDispatch::Routing::RouteSet:0x007fcad64c5d80>]> (RuntimeError)
    from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/railties-4.0.0.rc2/lib/rails/application/routes_reloader.rb:6:in `execute_if_updated'
    from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/railties-4.0.0.rc2/lib/rails/application/finisher.rb:69:in `block in <module:Finisher>'
    from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/railties-4.0.0.rc2/lib/rails/initializable.rb:30:in `instance_exec'
    from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/railties-4.0.0.rc2/lib/rails/initializable.rb:30:in `run'
    from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/railties-4.0.0.rc2/lib/rails/initializable.rb:55:in `block in run_initializers'
    from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/tsort.rb:150:in `block in tsort_each'
    from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'
    from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/tsort.rb:219:in `each_strongly_connected_component_from'
    from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/tsort.rb:182:in `block in each_strongly_connected_component'
    from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/tsort.rb:180:in `each'
    from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/tsort.rb:180:in `each_strongly_connected_component'
    from /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/tsort.rb:148:in `tsort_each'
    from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/railties-4.0.0.rc2/lib/rails/initializable.rb:54:in `run_initializers'
    from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/railties-4.0.0.rc2/lib/rails/application.rb:215:in `initialize!'
    from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/railties-4.0.0.rc2/lib/rails/railtie/configurable.rb:30:in `method_missing'
    from /Users/DavidStevenson/Desktop/omrails/omrails/config/environment.rb:5:in `<top (required)>'
    from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:228:in `require'
    from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:228:in `block in require'
    from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:213:in `load_dependency'
    from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:228:in `require'
    from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/railties-4.0.0.rc2/lib/rails/application.rb:189:in `require_environment!'
    from /usr/local/rvm/gems/ruby-1.9.3-p392/gems/railties-4.0.0.rc2/lib/rails/commands.rb:47:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'

I have looked in the routes.rb file and could not see anything apparently wrong. When I comment out the line:

devise_for :installs

I can run the server again. Any thoughts why this would happen?

Answer 1

Firstly, why do you use ruby 1.9.3 instead of 2.0 ? Secondly, why do you use rails 4.0.0.rc2 instead of its stable release 4.0 ?

For your question,

devise requires devise_for :users in your routes.rb file. It must be same as your resource name. Use user both in routes.rb and at your generator.

Answer 2

I found this error after migrating from Active Record to MongoID, the problem is that the Devise initializer ( config/initializers/devise.rb ) specifies the ORM (line 25 for me):

require 'devise/orm/active_record'

I just only needed to replace this line with:

require 'devise/orm/mongoid'

Now is working :)