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我试图从新安装的rails版本去。创建项目并根据我使用rails搭建的模型迁移数据库。我遇到了一个不知道如何构建任务'db :: migrate'的错误。Rake中止：不知道如何在安装rails后迁移
命令我跑..
删除所有宝石：
for i in 'gem list --no-versions'; do gem uninstall -aIx $i; done
安装导轨和创建新项目的
sudo gem install rails
rails new test-api
rails generate controller user index
rails generate model user name:string
所以这是我的设置..
然后我做的方法迁移我的数据库：
rake db::migrate
这里是我的输出：
rake db::migrate
rake aborted!
Don't know how to build task 'db::migrate'
/Library/Ruby/Gems/2.0.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:241:in `load'
/Library/Ruby/Gems/2.0.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:241:in `block in load'
/Library/Ruby/Gems/2.0.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:232:in `load_dependency'
/Library/Ruby/Gems/2.0.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:241:in `load'
/Library/Ruby/Gems/2.0.0/gems/spring-1.1.3/lib/spring/command_wrapper.rb:40:in `call'
/Library/Ruby/Gems/2.0.0/gems/spring-1.1.3/lib/spring/application.rb:180:in `block in serve'
/Library/Ruby/Gems/2.0.0/gems/spring-1.1.3/lib/spring/application.rb:153:in `fork'
/Library/Ruby/Gems/2.0.0/gems/spring-1.1.3/lib/spring/application.rb:153:in `serve'
/Library/Ruby/Gems/2.0.0/gems/spring-1.1.3/lib/spring/application.rb:128:in `block in run'
/Library/Ruby/Gems/2.0.0/gems/spring-1.1.3/lib/spring/application.rb:122:in `loop'
/Library/Ruby/Gems/2.0.0/gems/spring-1.1.3/lib/spring/application.rb:122:in `run'
/Library/Ruby/Gems/2.0.0/gems/spring-1.1.3/lib/spring/application/boot.rb:18:in `<top (required)>'
-e:1:in `<main>'
(See full trace by running task with --trace)
