2.rails笔记

最新推荐文章于 2024-12-03 15:27:20 发布

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#rails #attributes #migration #image #string #schema

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本文介绍如何使用 Rails 命令行工具创建控制器及使用 scaffold 生成 CRUD 操作的基本文件。通过实例演示了创建 Hello 控制器的过程，并详细记录了每一步生成的文件。此外，还展示了如何通过 scaffold 创建包含特定字段的产品模型。

6.can'find generate
script/xxx has only one file:rails.

oh,this is the diffrence between rail3 and rail2.
see diffrences here:
http://www.cnblogs.com/lexus/archive/2010/11/11/1875134.html

this book is old.so i read csdn blog first.
http://blog.youkuaiyun.com/abbuggy/article/details/7404975


7.rails g --help
show rails generate help

8.creat a new controller
administrator@ubuntu:~/www/depot$ rails g controller hello hello
      create  app/controllers/hello_controller.rb
       route  get "hello/hello"
      invoke  erb
      create    app/views/hello
      create    app/views/hello/hello.html.erb
      invoke  test_unit
      create    test/functional/hello_controller_test.rb
      invoke  helper
      create    app/helpers/hello_helper.rb
      invoke    test_unit
      create      test/unit/helpers/hello_helper_test.rb
      invoke  assets
      invoke    coffee
      create      app/assets/javascripts/hello.js.coffee
      invoke    scss
      create      app/assets/stylesheets/hello.css.scss

from see this file in app dictory.The dictory tree is very clear to coder.

After created,u can visited the web from:
http://localhost:3000/hello/hello
And u could see:
Hello#hello

Find me in app/views/hello/hello.html.erb 

in the website.

9.
$rails g scaffold product title:string description:text image_url:string
$rake db:migrate

$rails g migration add_price_to_product price:decimal
      invoke  active_record
      create    db/migrate/20120726135706_add_price_to_product.rb

mysql> select * from schema_migrations;
+----------------+
| version        |
+----------------+
| 20120726125236 |
| 20120726135706 |
+----------------+

10.Can't mass-assign protected attributes: price
app/models/product.rb
attr_accessible :description, :image_url, :title, :price