在Rails 3.2.8中使用jbuilder模板生成的Pretty Print JSON
问题描述：
有人有办法漂亮地打印jbuilder的JSON输出吗?
Anyone have a way to pretty print JSON output from jbuilder?
我可以使用以下类似的命令漂亮地打印控制器动作中生成的JSON:
I can pretty print JSON generated within a controller action with something like:
JSON.pretty_generate(some_json_object)
但是一旦我使用了jbuilder模板，我就不知道一种可以漂亮地打印输出的方法.
but once I pass off to a jbuilder template, I'm not aware of a way to have that output pretty printed.
现在，我的操作方法的render语句很简单:
Right now, my action method's render statement is simple:
render formats: :json
无论指定哪种输入格式类型(这都是我所希望的行为)，这都能成功地强制使用jbuilder进行渲染.
And this successfully forces a rendering with jbuilder, regardless of input format type specified (which is my desired behavior).
答
我认为这很简单
@package = Package.first
json = JSON.parse(@blog.to_json)
PP.pp(json)
{"id_to_s"=>"5222675dbc11149e3a000002",
"title"=>"Package Title",
"version"=>"0.1.1",
"comment"=>
{"user"=>"Joe",
"description"=>"Joe's comment"},
"assets"=>
[{"id_to_s"=>"522a4620fa451436f4000001",
"_type"=>"Illustration",
"start"=>0,
"stop"=>100,
"caption"=>"mountain climbing"},
{"id_to_s"=>"522a56a6fa4514523a000001",
"_type"=>"Illustration",
"start"=>200,
"stop"=>300,
"caption"=>"airport"},
{"id_to_s"=>"522a6a0ffa4514a30e000002",
"_type"=>"Illustration",
"start"=>400,
"stop"=>600,
"caption"=>"doc"},
{"id_to_s"=>"522aa46bbc1114551f000001",
"_type"=>"Illustration",
"start"=>nil,
"stop"=>nil,
"caption"=>nil},
{"id_to_s"=>"522aa47fbc1114551f000002",
"_type"=>"Illustration",
"start"=>10,
"stop"=>30,
"caption"=>"asdflkjsd"}]}
或者，更快的单线
PP.pp JSON.parse Blog.first.to_json