如何将 ruby 哈希对象转换为 JSON？
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How to convert a ruby hash object to JSON?
提问by kapso
How to convert a ruby hash object to JSON? So I am trying this example below & it doesn't work?
如何将 ruby 哈希对象转换为 JSON？所以我正在尝试下面的这个例子 & 它不起作用？
I was looking at the RubyDoc and obviously Hashobject doesn't have a to_jsonmethod. But I am reading on blogs that Rails supports active_record.to_jsonand also supports hash#to_json. I can understand ActiveRecordis a Rails object, but Hashis not native to Rails, it's a pure Ruby object. So in Rails you can do a hash.to_json, but not in pure Ruby??
我正在查看 RubyDoc，显然Hash对象没有to_json方法。但我正在阅读 Rails 支持active_record.to_json和也支持hash#to_json. 我可以理解ActiveRecord是一个 Rails 对象，但Hash不是 Rails 原生的，它是一个纯 Ruby 对象。所以在 Rails 中你可以做 a hash.to_json，但不能在纯 Ruby 中做？？
car = {:make => "bmw", :year => "2003"}
car.to_json
回答by Mladen Jablanovi?
One of the numerous niceties of Ruby is the possibility to extend existing classes with your own methods. That's called "class reopening" or monkey-patching (the meaning of the latter can vary, though).
Ruby 的众多优点之一是可以使用您自己的方法扩展现有类。这就是所谓的“重新开课”或猴子补丁（后者的含义可能会有所不同）。
So, take a look here:
所以，看看这里：
car = {:make => "bmw", :year => "2003"}
# => {:make=>"bmw", :year=>"2003"}
car.to_json
# NoMethodError: undefined method `to_json' for {:make=>"bmw", :year=>"2003"}:Hash
# from (irb):11
# from /usr/bin/irb:12:in `<main>'
require 'json'
# => true
car.to_json
# => "{"make":"bmw","year":"2003"}"
As you can see, requiring jsonhas magically brought method to_jsonto our Hash.
如您所见，jsonrequire 神奇地to_json为我们的Hash.
回答by nurettin
require 'json/ext' # to use the C based extension instead of json/pure
puts {hash: 123}.to_json
回答by Vinicius Brasil
You can also use JSON.generate:
您还可以使用JSON.generate：
require 'json'
JSON.generate({ foo: "bar" })
=> "{\"foo\":\"bar\"}"
Or its alias, JSON.unparse:
或者它的别名，JSON.unparse：
require 'json'
JSON.unparse({ foo: "bar" })
=> "{\"foo\":\"bar\"}"
回答by Apurv Pandey
Add the following line on the top of your file
在文件顶部添加以下行
require 'json'
Then you can use:
然后你可以使用：
car = {:make => "bmw", :year => "2003"}
car.to_json
Alternatively, you can use:
或者，您可以使用：
JSON.generate({:make => "bmw", :year => "2003"})
回答by Foram Thakral
You should include jsonin your file
你应该包括json在你的文件中
For Example,
例如，
require 'json'
your_hash = {one: "1", two: "2"}
your_hash.to_json
For more knowledge about jsonyou can visit below link.
Json Learning
有关json您的更多信息，请访问以下链接。
JSON学习
