我的Rails笔记(1)

《Agile Web Development With Rails》Notebook.

 

环境：

Rails 3.1.0 

Gem 1.8.10

Ruby ruby 1.9.2p180

 

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：

 

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