启动Rails服务器时未初始化的常量版本（NameError）
[英]Uninitialized constant Version (NameError) when starting Rails server
问题描述
So I had my app working just fine and then I had to migrate it over to a new development server. 
因此，我的应用程序运行良好，然后不得不将其迁移到新的开发服务器上。 I copied all the files over, ran bundle install with no errors and then when I run rails server 我复制了所有文件，运行包安装且没有错误，然后在运行Rails服务器时
I get this error. 我得到这个错误。
=> Ctrl-C to shutdown server
Exiting
C:/Sites/mysite/app/admin/version.rb:1:in <top (required)>': uninitialized con stant Version (NameError) from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activeadmin-0. 5.1/lib/active_admin/application.rb:190:inblock in load!'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activeadmin-0.
5.1/lib/active_admin/application.rb:190:in each' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activeadmin-0. 5.1/lib/active_admin/application.rb:190:inload!'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activeadmin-0.
5.1/lib/active_admin/application.rb:213:in routes' from C:inroutes'
from C:/Sites/mysite/config/routes.rb:13:in `block in '
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2
.11/lib/action_dispatch/routing/route_set.rb:282:in instance_exec' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2 .11/lib/action_dispatch/routing/route_set.rb:282:ineval_block'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2
.11/lib/action_dispatch/routing/route_set.rb:260:in draw' from C:/Sites/mysite/config/routes.rb:1:in'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
1/lib/rails/application/routes_reloader.rb:40:in block in load_paths' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1 1/lib/rails/application/routes_reloader.rb:40:ineach'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
1/lib/rails/application/routes_reloader.rb:40:in load_paths' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1 1/lib/rails/application/routes_reloader.rb:16:inreload!'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
1/lib/rails/application.rb:108:in reload_routes!' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activeadmin-0. 5.1/lib/active_admin/reloader.rb:34:inreload!'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activeadmin-0.
5.1/lib/active_admin/reloader.rb:61:in block in attach!' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport- 3.2.11/lib/active_support/callbacks.rb:429:in_run__334365865__prepare__8021230
81__callbacks'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-
3.2.11/lib/active_support/callbacks.rb:405:in __run_callback' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport- 3.2.11/lib/active_support/callbacks.rb:385:in_run_prepare_callbacks'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-
3.2.11/lib/active_support/callbacks.rb:81:in run_callbacks' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2 .11/lib/action_dispatch/middleware/reloader.rb:74:inprepare!'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2
.11/lib/action_dispatch/middleware/reloader.rb:48:in prepare!' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1 1/lib/rails/application/finisher.rb:47:inblock in module:Finisher'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
1/lib/rails/initializable.rb:30:in instance_exec' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1 1/lib/rails/initializable.rb:30:inrun'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
1/lib/rails/initializable.rb:55:in block in run_initializers' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1 1/lib/rails/initializable.rb:54:ineach'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
1/lib/rails/initializable.rb:54:in run_initializers' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1 1/lib/rails/application.rb:136:ininitialize!'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
1/lib/rails/railtie/configurable.rb:30:in method_missing' from C:/Sites/mysite/config/environment.rb:5:in'
from C:/Sites/mysite/config.ru:3:in block in <main>' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rack-1.4.5/lib /rack/builder.rb:51:ininstance_eval'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rack-1.4.5/lib
/rack/builder.rb:51:in initialize' from C:/Sites/mysite/config.ru:innew'
from C:/Sites/mysite/config.ru:in <main>' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rack-1.4.5/lib /rack/builder.rb:40:ineval'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rack-1.4.5/lib
/rack/builder.rb:40:in parse_file' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rack-1.4.5/lib /rack/server.rb:200:inapp'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
1/lib/rails/commands/server.rb:46:in app' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rack-1.4.5/lib /rack/server.rb:304:inwrapped_app'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rack-1.4.5/lib
/rack/server.rb:254:in start' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1 1/lib/rails/commands/server.rb:70:instart'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
1/lib/rails/commands.rb:55:in block in <top (required)>' from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1 1/lib/rails/commands.rb:50:intap'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
1/lib/rails/commands.rb:50:in <top (required)>' from script/rails:6:inrequire'
from script/rails:6:in `
Any clue what's going on here? 任何线索，这是怎么回事？
EDIT: Code Inside app/admin/version.rb 编辑：app / admin / version.rb中的代码
ActiveAdmin.register Version do
end
EDIT: Routes.rb Code 编辑：Routes.rb代码
Mysite::Application.routes.draw do
ActiveAdmin.routes(self)
devise_for :users
get 'application/index'
root :to => 'application#index'
end
1 个解决方案
解决方案1
2 2015-05-15 12:46:25
Do you have version.rb model. 您是否有version.rb模型。 If not then first generate model 如果没有，则首先生成模型
rails generate model version name:string
It will create model and migration for version, add columns of your choice in following code. 它将为版本创建模型和迁移，并在以下代码中添加您选择的列。
20150514124720_create_versions.rb 20150514124720_create_versions.rb
class CreateVersions < ActiveRecord::Migration
def change
create_table :versions do |t|
t.string :name
# also add other attributes of your choice here
t.timestamps
end
end
end
And, then run migration 然后，运行迁移
rake db:migrate
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