晴天的专栏

1. 在以下网址下载并运行 Rails 安装包： 点击打开链接2. 检查 ruby，sqlite 和 rails 是否安装成功2.1 查看 ruby 版本， 在命令行中输入：ruby -v运行截图如下：2.2 查看 sqlite 版本，在命令行中输入：sqlite3 --version运行截图如下：2.3 查看 rails 版本，在命令行中输

Name Begins WithVariable Scope$A global variable@An instance variable[a-z] or _A local variable[A-Z]A constant@@A class variable以一个简单例子示例各种变量的区别：c

1. Why use Marshal?Basically anytime you want to store a whole object in byte stream and need to retrieve the object from the byte stream later.This is the situation I encountered and also why

For example, we have this Channel class:class Channel attr_reader :id, :name def initialize(id, name) @id = id @name = name endend1.What we have:One list of objects:

Sometimes we need to submit form using methods other than ‘post’, in this example, it’s ‘delete’.For example, I wanted to delete a user when a form is submitted with the user name and ‘delete’ met

1. 下载Google Analytics， 并且初始化 tracker。 2. 设置 tracking ID 环境变量3. 把 Google Analytics view 加入 application layout4. 在一个 javascript 文件中写入追踪页面访问代码

In the test,  we should use the ‘describe’,  ‘context’, ‘it’ structure.Here I use a controller test as an example.I have this my_controller.rb with two controller actions:class MyControlle

How to render the search page?How to perform the search function?How to render the item list page?How to design controller, routes, and view.

Why sometimes we may want to disable outputting return object?How to disable?