Ror study Note 1

This article comes from: Web development agility-applying rails for agile web development (version 4)

Environment:

Ruby 1.9.3p392 () [i386-mingw32]

Rails 3.2.13

Gem 2.0.3

SQLite

1. Configure the ROS environment in Windows

Use the rubyinstaller installation package. For detailed installation methods, see composer;

2. Hello world!

Run cmd;

Rails news demo

CD demo

Rails s

The above command creates a simple example,

Rails generate controller say hello goodbye // create a controller say. You can understand that say is a class, and hello and goodbye are two methods in the class;

Go to the demo directory and open ../demo/APP/contrallers/say_controller.rb. The following figure is displayed:Code

Class saycontroller <applicationcontroller
Def hello
End

Def goodbye
End
End

Enter URL: http: // localhost: 3000/say/hello in the browser.

Show say # Hello ·····

Then we open the file on this page (located in ../demo/APP/hello.html. ERB) and replace the code in it.

<H1> Hello World

Refresh: http: // localhost: 3000/say/Hello

3. simple dynamic page

Export the following code to hello.html. ERB

<P> it is now <% = time. Now %>

The current time will appear when loading http: // localhost: 3000/say/hello.

Now we need to make some improvements to the above Code.

Open ../demo/APP/controller/say_controller.rb and modify the Code as follows:

Class saycontroller <applicationcontroller
Def hello
@ Time = time. Now
End

Def goodbye
End
End

The hello.html. ERB code is modified:

<H1> Hello form rails! </H1>
<P> it's now <% = @ time %> </P>

Refresh http: // localhost: 3000/say/hello.

4. link_to
The hello.html. ERB code is modified:

<H1> Hello form rails! </H1>
<P> it's now <% = @ time %> </P>
<P> time to say
<% = Link_to "goodbye", say_goodbye_path %>!
</P>

Now there will be the following sentence on the page: Click to link to http: // localhost: 3000/say/goodbye.

Then we modify goodbye.html. ERB.

<H1> goodbye! </H1>
<P> It was nice having you here. </P>
<P>
Say <% = link_to "hello", say_hello_path %> again.
</P>

 

The first chapter is complete.

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