如何将 Pry 与 Sinatra 一起使用? [英] How to use Pry with Sinatra?
问题描述
我正在编写我的第一个 Sinatra 应用程序，并想使用 Pry 来检查/调试应用程序中发生的一些事情.我之前也没有使用过 Pry，但我想尝试一下.我如何开始在 Sinatra 应用程序中使用 Pry?
I am writing my first Sinatra application and would like to use Pry to inspect/debug some things going on in the application. I haven't used Pry before either, but I would like to try it out. How would I get started using Pry with my Sinatra application?
推荐答案
总结
- 在应用程序顶部使用
require 'pry'. - 每当您想进入交互式会话时，请在您的代码中调用
binding.pry.有关使用 Pry 的信息，请参阅 TurningIRB 使用 Pry 和 Pry wiki. - 当您完成特定的交互式会话后，输入
exit或 Ctrl-D；Sinatra 将在停止的地方继续运行.
- Use
require 'pry'at the top of your application. - Call
binding.pryin your code whenever you want to drop into the interactive session. For information on using Pry, see Turning IRB on its head with Pry and the Pry wiki. - When you are done with a particular interactive session, type
exitor Ctrl-D; Sinatra will resume running where it left off.
示例
require 'sinatra'
require 'pry'
get '/' do
@cats = rand(100)
html = haml :index
binding.pry
html
end
__END__
@@index
%html
<head><title>Hello World</title></head>
%body
%p I have #{@cats} cat#{:s unless @cats==1}!
这是我启动 Web 服务器时的样子:
Here's what it looks like when I start the web server:
C:\>ruby pry_into_sinatra.rb
== Sinatra/1.2.6 has taken the stage on 4567 for development with backup from Thin
>> Thin web server (v1.2.11 codename Bat-Shit Crazy)
>> Maximum connections set to 1024
>> Listening on 0.0.0.0:4567, CTRL+C to stop
当我在 Web 浏览器中向 http://localhost:4567 发出请求时，控制台会进入 Pry 调试器在发送结果之前:
When I make a request in a web browser to http://localhost:4567 the console drops into the Pry debugger before sending the result:
From: pry_into_sinatra.rb @ line 7 in Sinatra::Application#HEAD /:
2: require 'pry'
3:
4: get '/' do
5: @cats = rand(100)
6: html = haml :index
=> 7: binding.pry
8: html
9: end
10:
11: __END__
12: @@index
pry(#<Sinatra::Application:0x3300ac8>)> @cats
=> 42
pry(#<Sinatra::Application:0x3300ac8>)> puts html
<html>
<head><title>Hello World</title></head>
<body>
<p>I have 42 cats!</p>
</body>
</html>
=> nil
pry(#<Sinatra::Application:0x3300ac8>)> exit
127.0.0.1 - - [24/Aug/2011 13:25:57] "GET / HTTP/1.1" 200 96 28.5390
127.0.0.1 - - [24/Aug/2011 13:25:57] "GET /favicon.ico HTTP/1.1" 404 447 0.0010
进一步调试
如果您希望能够使用传统的调试命令，例如设置基于行的断点，或单步执行，或在引发异常时中断，请参阅 PryDebug 库，来自 Mon-Ouie.
Further Debugging
If you want to be able to use traditional debugging commands, such as setting line-based breakpoints, or stepping, or breaking when exceptions are raised, see the PryDebug library by Mon-Ouie.
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