在上一个会话中运行rake db：migrate之后，我遇到启动rails服务器的问题。我已经安装了devise并在我的应用程序中设置了一个新的数据库，这似乎运行良好，但我重启我的应用程序后无法启动新的服务器。有什么想法吗？
Taylors-MacBook-Pro:pinteresting taylorburton$ rails s
=> Booting WEBrick
=> Rails 4.2.0 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
Exiting
/Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/devise-3.3.0/lib/devise/rails/routes.rb:457:in `ensure in with_devise_exclusive_scope': undefined method `merge!' for #<ActionDispatch::Routing::Mapper::Scope:0x007f7fdbea1f70> (NoMethodError)
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/devise-3.3.0/lib/devise/rails/routes.rb:457:in `with_devise_exclusive_scope'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/devise-3.3.0/lib/devise/rails/routes.rb:248:in `block (2 levels) in devise_for'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/devise-3.3.0/lib/devise/rails/routes.rb:351:in `block in devise_scope'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/actionpack-4.2.0/lib/action_dispatch/routing/mapper.rb:940:in `block in constraints'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/actionpack-4.2.0/lib/action_dispatch/routing/mapper.rb:816:in `scope'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/actionpack-4.2.0/lib/action_dispatch/routing/mapper.rb:940:in `constraints'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/devise-3.3.0/lib/devise/rails/routes.rb:350:in `devise_scope'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/devise-3.3.0/lib/devise/rails/routes.rb:247:in `block in devise_for'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/devise-3.3.0/lib/devise/rails/routes.rb:223:in `each'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/devise-3.3.0/lib/devise/rails/routes.rb:223:in `devise_for'
from /Users/taylorburton/Desktop/pinteresting/config/routes.rb:2:in `block in <top (required)>'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:423:in `instance_exec'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:423:in `eval_block'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:401:in `draw'
from /Users/taylorburton/Desktop/pinteresting/config/routes.rb:1:in `<top (required)>'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `load'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `block in load'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `load'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:40:in `block in load_paths'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:40:in `each'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:40:in `load_paths'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:16:in `reload!'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:26:in `block in updater'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/activesupport-4.2.0/lib/active_support/file_update_checker.rb:75:in `call'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/activesupport-4.2.0/lib/active_support/file_update_checker.rb:75:in `execute'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:27:in `updater'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:7:in `execute_if_updated'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/application/finisher.rb:69:in `block in <module:Finisher>'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `instance_exec'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `run'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/initializable.rb:55:in `block in run_initializers'
from /Users/taylorburton/.rvm/rubies/ruby-2.0.0-p598/lib/ruby/2.0.0/tsort.rb:150:in `block in tsort_each'
from /Users/taylorburton/.rvm/rubies/ruby-2.0.0-p598/lib/ruby/2.0.0/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'
from /Users/taylorburton/.rvm/rubies/ruby-2.0.0-p598/lib/ruby/2.0.0/tsort.rb:219:in `each_strongly_connected_component_from'
from /Users/taylorburton/.rvm/rubies/ruby-2.0.0-p598/lib/ruby/2.0.0/tsort.rb:182:in `block in each_strongly_connected_component'
from /Users/taylorburton/.rvm/rubies/ruby-2.0.0-p598/lib/ruby/2.0.0/tsort.rb:180:in `each'
from /Users/taylorburton/.rvm/rubies/ruby-2.0.0-p598/lib/ruby/2.0.0/tsort.rb:180:in `each_strongly_connected_component'
from /Users/taylorburton/.rvm/rubies/ruby-2.0.0-p598/lib/ruby/2.0.0/tsort.rb:148:in `tsort_each'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/initializable.rb:54:in `run_initializers'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/application.rb:352:in `initialize!'
from /Users/taylorburton/Desktop/pinteresting/config/environment.rb:5:in `<top (required)>'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `block in require'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
from /Users/taylorburton/Desktop/pinteresting/config.ru:3:in `block in <main>'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/rack-1.6.0/lib/rack/builder.rb:55:in `instance_eval'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/rack-1.6.0/lib/rack/builder.rb:55:in `initialize'
from /Users/taylorburton/Desktop/pinteresting/config.ru:in `new'
from /Users/taylorburton/Desktop/pinteresting/config.ru:in `<main>'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/rack-1.6.0/lib/rack/builder.rb:49:in `eval'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/rack-1.6.0/lib/rack/builder.rb:49:in `new_from_string'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/rack-1.6.0/lib/rack/builder.rb:40:in `parse_file'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/rack-1.6.0/lib/rack/server.rb:299:in `build_app_and_options_from_config'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/rack-1.6.0/lib/rack/server.rb:208:in `app'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/commands/server.rb:61:in `app'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598@global/gems/rack-1.6.0/lib/rack/server.rb:336:in `wrapped_app'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/commands/server.rb:139:in `log_to_stdout'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/commands/server.rb:78:in `start'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:80:in `block in server'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `tap'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `server'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>'
from /Users/taylorburton/Desktop/pinteresting/bin/rails:8:in `require'
from /Users/taylorburton/Desktop/pinteresting/bin/rails:8:in `<top (required)>'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/spring-1.3.3/lib/spring/client/rails.rb:27:in `load'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/spring-1.3.3/lib/spring/client/rails.rb:27:in `call'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/spring-1.3.3/lib/spring/client/command.rb:7:in `call'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/spring-1.3.3/lib/spring/client.rb:26:in `run'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/spring-1.3.3/bin/spring:48:in `<top (required)>'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/spring-1.3.3/lib/spring/binstub.rb:11:in `load'
from /Users/taylorburton/.rvm/gems/ruby-2.0.0-p598/gems/spring-1.3.3/lib/spring/binstub.rb:11:in `<top (required)>'
from /Users/taylorburton/Desktop/pinteresting/bin/spring:13:in `require'
from /Users/taylorburton/Desktop/pinteresting/bin/spring:13:in `<top (required)>'
from bin/rails:3:in `load'
from bin/rails:3:in `<main>'
答案 0 :(得分：1)
试试这个：
在您的Gemfile中，更改版本：
gem 'devise', '~> 3.4.0'
而不是在您的终端中运行：
bundle update devise