我的Rails笔记(1)_Ruby_编程开发_程序员俱乐部

《Agile Web Development With Rails》Notebook.

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环境：

Rails 3.1.0?

Gem?1.8.10

Ruby?ruby 1.9.2p180

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1. rails depot

2.?rails generate scaffold Product title:string description:text image_url:string price:decimal

报错：/1.9.1/gems/execjs-1.2.8/lib/execjs/runtimes.rb:47:in?`autodetect':?Could?not?find?a?JavaScript?runtime.?See?

https://github.com/sstephenson/execjs?for?a?list?of?available?runtimes.?(ExecJS::RuntimeUnavailable)

解决方法：

在Gemfile中增加：

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gem 'execjs'

gem 'therubyracer'

然后运行：

bundle install

3.?db/migrate/20110922081755_create_products.rb 是一个migration。migration代表a change we want to make to the data.

4. rake db:migrate?

Rake looks for all the migrations not yet applied to the database and applies them.

报错：

uninitialized constant Rake::DSL

解决方法：

gem install rake

5. rails server -p 3002

6. 修改app/views/products/_form.html.erb

7. rake test