Question

我正在创建一个简单的用户表，当我运行rake db：migrate时，它似乎是create_table（：users）Howerver我同时收到了以下警告。我尝试再次运行rake db：migrate然后在此页面上出现第二个错误。如何检查表是否已创建，以及如何防止出现此警告/错误？

ERROR1

    WARNING: 'require 'rake/rdoctask'' is deprecated.  Please use 'require 'rdoc/task' (in RDoc 2.4.2+)' instead.
    at /Users/anderskitson/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/rdoctask.rb
WARNING: Global access to Rake DSL methods is deprecated.  Please include
    ...  Rake::DSL into classes and modules which use the Rake DSL methods.
WARNING: DSL method DemoApp::Application#task called at /Users/anderskitson/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/railties-3.0.1/lib/rails/application.rb:214:in `initialize_tasks'

错误2

rake aborted!
undefined local variable or method `d' for main:Object

这就是我用--trace

获得的

/Users/anderskitson/rails_project/demo_app/Rakefile:1:in `<top (required)>'
/Users/anderskitson/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/rake_module.rb:25:in `load'
/Users/anderskitson/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/rake_module.rb:25:in `load_rakefile'
/Users/anderskitson/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:501:in `raw_load_rakefile'
/Users/anderskitson/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:82:in `block in load_rakefile'
/Users/anderskitson/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/Users/anderskitson/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:81:in `load_rakefile'
/Users/anderskitson/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:65:in `block in run'
/Users/anderskitson/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/Users/anderskitson/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
/Users/anderskitson/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
/Users/anderskitson/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/bin/rake:19:in `load'
/Users/anderskitson/.rvm/gems/ruby-1.9.2-p290@rails3tutorial/bin/rake:19:in `<main>'

我跑了

rails generate scaffold用户名：string email：string

然后我跑了

rake db:migrate

我的rake文件看起来像

d# Add your own tasks in files placed in lib/tasks ending in .rake,
# for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.

require File.expand_path('../config/application', __FILE__)
require 'rake'


DemoApp::Application.load_tasks

Answer 1

删除作为Rakefile中第一个字符的d：

d# Add your own tasks in files placed in lib/tasks ending in .rake,

你会认识到这一行是因为它是你粘贴的错误信息中指向的行号，你可以告诉那是该行的错误部分，因为它正是错误信息告诉你它的字母。不确定。

Answer 2

这取决于您当前使用的Rails版本，但我建议生成一个新的Rails应用程序并复制生成的Rakefile以确保您是最新的。

也就是说，这个警告可能不会导致迁移失败。

使用require "rake/rdoctask"再次运行它以获得完整的堆栈跟踪。

rake db：migrate失败

2 个答案: