所以我正在研究Rails并且对我的用户模型感到有点沮丧所以我将其销毁（我也使用了可能是错误来源的设计）。在我的辩护中，我感到疲倦，沮丧，并且有点醉意。我尝试用简单的rails g scaffold user first:text last:text添加它，但在尝试生成模型时出现以下错误。我如何解决这个问题呢？
/home/action/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.0/lib/active_support/inflector/methods.rb:226:in `const_get': uninitialized constant User (NameError)
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.0/lib/active_support/inflector/methods.rb:226:in `block in constantize'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.0/lib/active_support/inflector/methods.rb:224:in `each'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.0/lib/active_support/inflector/methods.rb:224:in `inject'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.0/lib/active_support/inflector/methods.rb:224:in `constantize'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/devise-3.1.1/lib/devise.rb:285:in `get'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/devise-3.1.1/lib/devise/mapping.rb:77:in `to'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/devise-3.1.1/lib/devise/mapping.rb:72:in `modules'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/devise-3.1.1/lib/devise/mapping.rb:89:in `routes'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/devise-3.1.1/lib/devise/mapping.rb:156:in `default_used_route'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/devise-3.1.1/lib/devise/mapping.rb:66:in `initialize'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/devise-3.1.1/lib/devise.rb:319:in `new'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/devise-3.1.1/lib/devise.rb:319:in `add_mapping'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/devise-3.1.1/lib/devise/rails/routes.rb:210:in `block in devise_for'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/devise-3.1.1/lib/devise/rails/routes.rb:209:in `each'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/devise-3.1.1/lib/devise/rails/routes.rb:209:in `devise_for'
from /home/action/workspace/surrigo/config/routes.rb:2:in `block in <top (required)>'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.0.0/lib/action_dispatch/routing/route_set.rb:316:in `instance_exec'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.0.0/lib/action_dispatch/routing/route_set.rb:316:in `eval_block'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.0.0/lib/action_dispatch/routing/route_set.rb:294:in `draw'
from /home/action/workspace/surrigo/config/routes.rb:1:in `<top (required)>'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/application/routes_reloader.rb:40:in `block in load_paths'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/application/routes_reloader.rb:40:in `each'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/application/routes_reloader.rb:40:in `load_paths'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/application/routes_reloader.rb:16:in `reload!'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/application/routes_reloader.rb:26:in `block in updater'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.0/lib/active_support/file_update_checker.rb:75:in `call'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.0/lib/active_support/file_update_checker.rb:75:in `execute'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/application/routes_reloader.rb:27:in `updater'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/application/routes_reloader.rb:6:in `execute_if_updated'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/application/finisher.rb:69:in `block in <module:Finisher>'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/initializable.rb:30:in `instance_exec'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/initializable.rb:30:in `run'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/initializable.rb:55:in `block in run_initializers'
from /home/action/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:150:in `block in tsort_each'
from /home/action/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'
from /home/action/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:219:in `each_strongly_connected_component_from'
from /home/action/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:182:in `block in each_strongly_connected_component'
from /home/action/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:180:in `each'
from /home/action/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:180:in `each_strongly_connected_component'
from /home/action/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/tsort.rb:148:in `tsort_each'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/initializable.rb:54:in `run_initializers'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/application.rb:215:in `initialize!'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/railtie/configurable.rb:30:in `method_missing'
from /home/action/workspace/surrigo/config/environment.rb:13:in `<top (required)>'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/application.rb:189:in `require_environment!'
from /home/action/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/commands.rb:45:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
答案 0 :(得分：33)
从 routes.rb 中删除行devise_for :users，然后尝试运行rails g scaffold user first:text last:text。它应该工作正常。
devise_for方法需要User模型。因此，当您运行rails scaffold命令
答案 1 :(得分：0)
也许你与命名约定有冲突？
尝试
rails g scaffold User first:text last:text
代替。 您正在为类User生成一个模型（类是Ruby中的资本化CamelCase）