将ActiveRecord对象转储为JSON(在Rails控制台中):

pp User.first.as_json

# => {
 "id" => 1,
 "first_name" => "Polar",
 "last_name" => "Bear"
}

使用pretty_generate()函数，该函数内置于JSON的后期版本中。例如:

require 'json'
my_object = { :array => [1, 2, 3, { :sample => "hash"} ], :foo => "bar" }
puts JSON.pretty_generate(my_object)

这就得到了:

{
  "array": [
    1,
    2,
    3,
    {
      "sample": "hash"
    }
  ],
  "foo": "bar"
}

如果你想:

自动美化应用程序中所有传出的JSON响应。 避免污染Object#to_json/#as_json 避免使用中间件解析/重新呈现JSON(讨厌!) 用铁路的方式去做!

然后……为JSON替换ActionController::Renderer !只需将以下代码添加到您的ApplicationController:

ActionController::Renderers.add :json do |json, options|
  unless json.kind_of?(String)
    json = json.as_json(options) if json.respond_to?(:as_json)
    json = JSON.pretty_generate(json, options)
  end

  if options[:callback].present?
    self.content_type ||= Mime::JS
    "#{options[:callback]}(#{json})"
  else
    self.content_type ||= Mime::JSON
    json
  end
end

如果您希望在Rails控制器动作中快速实现此功能以发送JSON响应:

def index
  my_json = '{ "key": "value" }'
  render json: JSON.pretty_generate( JSON.parse my_json )
end

如果你想要处理active_record对象，puts就足够了。

例如:

没有了

2.6.0 (main):0 > User.first.to_json
  User Load (0.4ms)  SELECT  "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT $1  [["LIMIT", 1]]
=> "{\"id\":1,\"admin\":true,\"email\":\"admin@gmail.com\",\"password_digest\":\"$2a$10$TQy3P7NT8KrdCzliNUsZzuhmo40LGKoth2hwD3OI.kD0lYiIEwB1y\",\"created_at\":\"2021-07-20T08:34:19.350Z\",\"updated_at\":\"2021-07-20T08:34:19.350Z\",\"name\":\"Arden Stark\"}"

与使

2.6.0 (main):0 > puts User.first.to_json
  User Load (0.3ms)  SELECT  "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT $1  [["LIMIT", 1]]
{"id":1,"admin":true,"email":"admin@gmail.com","password_digest":"$2a$10$TQy3P7NT8KrdCzliNUsZzuhmo40LGKoth2hwD3OI.kD0lYiIEwB1y","created_at":"2021-07-20T08:34:19.350Z","updated_at":"2021-07-20T08:34:19.350Z","name":"Arden Stark"}
=> nil

如果你处理json数据，json。Pretty_generate是一个很好的替代方案

例子:

obj = {foo: [:bar, :baz], bat: {bam: 0, bad: 1}}
json = JSON.pretty_generate(obj)
puts json

输出:

{
  "foo": [
    "bar",
    "baz"
  ],
  "bat": {
    "bam": 0,
    "bad": 1
  }
}

如果是在ROR项目中，我总是喜欢使用gem pry-rails在rails控制台中格式化我的代码，而不是awesome_print，这太冗长了。

撬轨的例子:

它还有语法高亮显示。

# example of use:
a_hash = {user_info: {type: "query_service", e_mail: "my@email.com", phone: "+79876543322"}, cars_makers: ["bmw", "mitsubishi"], car_models: [bmw: {model: "1er", year_mfc: 2006}, mitsubishi: {model: "pajero", year_mfc: 1997}]}
pretty_html = a_hash.pretty_html

# include this module to your libs:
module MyPrettyPrint
    def pretty_html indent = 0
        result = ""
        if self.class == Hash
            self.each do |key, value|
                result += "#{key}: #{[Array, Hash].include?(value.class) ? value.pretty_html(indent+1) : value}"
            end
        elsif self.class == Array
            result = "[#{self.join(', ')}]"
        end
        "#{result}"
    end

end

class Hash
    include MyPrettyPrint
end

class Array
    include MyPrettyPrint
end