[英]Ruby on rails 5 uninitialized constant ApplicationRecord (NameError)
[英]NameError: uninitialized constant ApplicationRecord
我收到上述錯誤,但我相信我使用的是 rails 5:
turlingdrome$ rails -v
/Users/brianp/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.3/lib/rails/app_loader.rb:53: warning: Insecure world writable dir /Users/brianp/work in PATH, mode 040777
Rails 5.2.0
turlingdrome$ rake db:migrate
rake aborted!
NameError: uninitialized constant ApplicationRecord
/Users/brianp/work/online-reporting/app/models/client.rb:1:in `<top (required)>'
/Users/brianp/work/online-reporting/config/routes.rb:7:in `block in <top (required)>'
/Users/brianp/work/online-reporting/config/routes.rb:1:in `<top (required)>'
/Users/brianp/work/online-reporting/config/environment.rb:5:in `<top (required)>'
Tasks: TOP => db:migrate => db:load_config => environment
(See full trace by running task with --trace)
我認為 --trace 沒有用...但如果需要可以附加它...
在版本 5 之前,Rails 生成的模型繼承自ActiveRecord::Base
。
# rails g model foo.
class Foo < ActiveRecord::Base
end
Rails 5 引入了ApplicationRecord
,它是等效於ApplicationController
的模型。 因此在 Rails 5 上生成以下內容:
# rails g model foo.
class Foo < ApplicationRecord
end
ApplicationRecord 類本身是在您運行rails new
時生成的。
然而,它並沒有什么神奇之處——它只是一個根植於慣例中的超類。
# app/models/application_record.rb
class ApplicationRecord < ActiveRecord::Base
self.abstract_class = true
end
如果您收到NameError: uninitialized constant ApplicationRecord
您要么在未創建的情況下升級到 Rails 5,要么錯誤地將其刪除。 解決方案只是創建文件。
您有兩個選擇,您可以將app/models/client.rb
類聲明更改為:
class Client < ActiveRecord::Base
或者,您可以創建一個包含以下內容的app/models/application_record.rb
文件:
class ApplicationRecord < ActiveRecord::Base
self.abstract_class = true
end
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.