After you made rails destroy Users and you want to create again User model, When you create, if you’ re getting like this error,
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| $ leylakapicmd@leylakapicmd:~/workspace/project-library$ rails g model User provider uid name oauth_token
/home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/active_support/inflector/methods.rb:238:in const_get: uninitialized constant User (NameError)
$ leylakapicmd@leylakapicmd:~/workspace/project-library$ rails g model User
/home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/active_support/inflector/methods.rb:238:inconst_get': uninitialized constant User (NameError)
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/active_support/inflector/methods.rb:238:inblock in constantize'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/active_support/inflector/methods.rb:236:ineach'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/active_support/inflector/methods.rb:236:ininject'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/active_support/inflector/methods.rb:236:inconstantize'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/devise-3.2.4/lib/devise.rb:297:inget'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/devise-3.2.4/lib/devise/mapping.rb:77:into'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/devise-3.2.4/lib/devise/mapping.rb:72:inmodules'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/devise-3.2.4/lib/devise/mapping.rb:89:inroutes'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/devise-3.2.4/lib/devise/mapping.rb:156:indefault_used_route'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/devise-3.2.4/lib/devise/mapping.rb:66:ininitialize'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/devise-3.2.4/lib/devise.rb:331:innew'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/devise-3.2.4/lib/devise.rb:331:inadd_mapping'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/devise-3.2.4/lib/devise/rails/routes.rb:221:inblock in devise_for'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/devise-3.2.4/lib/devise/rails/routes.rb:220:ineach'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/devise-3.2.4/lib/devise/rails/routes.rb:220:indevise_for'
from /home/leylakapicmd/workspace/project-library/config/routes.rb:3:inblock in <top (required)>'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/actionpack-4.1.1/lib/action_dispatch/routing/route_set.rb:335:ininstance_exec'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/actionpack-4.1.1/lib/action_dispatch/routing/route_set.rb:335:ineval_block'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/actionpack-4.1.1/lib/action_dispatch/routing/route_set.rb:313:indraw'
from /home/leylakapicmd/workspace/project-library/config/routes.rb:1:in<top (required)>'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/application/routes_reloader.rb:40:inblock in load_paths'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/application/routes_reloader.rb:40:ineach'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/application/routes_reloader.rb:40:inload_paths'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/application/routes_reloader.rb:16:inreload!'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/application/routes_reloader.rb:26:inblock in updater'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/active_support/file_update_checker.rb:75:incall'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/active_support/file_update_checker.rb:75:inexecute'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/application/routes_reloader.rb:27:inupdater'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/application/routes_reloader.rb:7:inexecute_if_updated'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/application/finisher.rb:71:inblock in <module:Finisher>'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/initializable.rb:30:ininstance_exec'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/initializable.rb:30:inrun'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/initializable.rb:55:inblock in run_initializers'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/2.0.0/tsort.rb:150:inblock in tsort_each'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/2.0.0/tsort.rb:183:inblock (2 levels) in each_strongly_connected_component'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/2.0.0/tsort.rb:219:ineach_strongly_connected_component_from'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/2.0.0/tsort.rb:182:inblock in each_strongly_connected_component'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/2.0.0/tsort.rb:180:ineach'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/2.0.0/tsort.rb:180:ineach_strongly_connected_component'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/2.0.0/tsort.rb:148:intsort_each'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/initializable.rb:54:inrun_initializers'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/application.rb:288:ininitialize!'
from /home/leylakapicmd/workspace/project-library/config/environment.rb:5:in<top (required)>'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/application.rb:264:inrequire_environment!'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/commands/commands_tasks.rb:147:inrequire_application_and_environment!'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/commands/commands_tasks.rb:133:ingenerate_or_destroy'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/commands/commands_tasks.rb:51:ingenerate'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/commands/commands_tasks.rb:40:inrun_command!'
from /home/leylakapicmd/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/commands.rb:17:in<top (required)>'
from bin/rails:4:inrequire'
from bin/rails:4:in<main>'
|
You need to remove devise_for :users from routes.rb, then try generate and you don’t forget made rake:db migrate.
After migrate, if you have new error from db, you can make this command with orderly.
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| rake db:drop
rake db:create
rake db:reset
rake db:migrate
|
That’s all.
I hope solve your problem.