在写这个问题之前,我查看了这些答案,但无法找到解决方案:
执行rails生成脚手架时出错用户名:string email:string
耙子流产了!用于ActiveRecord :: Base的未定义方法`migration_error =':Class
启动Rails服务器时出错:未定义方法'configure'
当我尝试启动一个新的应用程序(对于 Hartl的教程,第2章),在阶段脚手架开始时,我得到一个错误,如:
**undefined method `configure' for #<SampleApp2::Application:0x00000101a74610> (NoMethodError)**
但是由于上面的例子,我编辑了development.rb文件:
DemoApp::Application.configure do
(是的,我的应用程序名为demo_app,所以我改名了).
之后,我尝试再次运行scaffold,但遇到了一个新错误:
**method_missing': undefined method raise_in_transactional_callbacks=' for ActiveRecord::Base:Class (NoMethodError)**
对类似情况的回应表明了一种迁移方法 - 它应该从文件development.rb中删除.同样,我试图在这个文件中找到raise_in_transactional_callbacks方法,但它不存在!另外,我会说在cmd中生成的完整代码非常大:
C:\Sites\demo_app>rails generate scaffold User name:string email:string
invoke active_record
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/active_record/dynamic_matchers.rb:22:in `method_missing': undefined method `raise_in_transactional_callbacks=' for ActiveRecord::Base:Class (NoMethodError)
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/active_record/railtie.rb:166:in `block (3 levels) in <class:Railtie>'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/active_record/railtie.rb:165:in `each'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/active_record/railtie.rb:165:in `block (2 levels) in <class:Railtie>'
…
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-4.0.2/lib/rails/commands.rb:48:in …我在Windows上.Ruby v.1.9.3p392/Rails v.3.2.13 - 这是Michael Hart的Ruby on Rails教程第2章中的demo_app项目.
当我发出' rails generate scaffold用户名:string email:string ' 时,会出现此错误.任何想法如何解决这个问题？
C:\ruby\rails_projects\demo_app>rails generate scaffold User name:string email:s
tring
invoke active_record
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.13/lib/act
ive_record/dynamic_matchers.rb:55:in `method_missing': undefined method `migrati
on_error=' for ActiveRecord::Base:Class (NoMethodError)
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3
.2.13/lib/active_record/railtie.rb:66:in `block (3 levels) in <class:Railtie>'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3
.2.13/lib/active_record/railtie.rb:65:in `each'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3
.2.13/lib/active_record/railtie.rb:65:in `block (2 levels) in <class:Railtie>'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-
3.2.13/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-
3.2.13/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-
3.2.13/lib/active_support/lazy_load_hooks.rb:43:in `block in run_load_hooks'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-
3.2.13/lib/active_support/lazy_load_hooks.rb:42:in `each'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-
3.2.13/lib/active_support/lazy_load_hooks.rb:42:in `run_load_hooks'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3
.2.13/lib/active_record/base.rb:720:in `<top …