如何将递归/嵌套的OpenStruct对象转换为Hash

时间:2018-08-22 06:36:22

标签: ruby-on-rails json ruby openstruct

我有一个OpenStruct对象,需要转换为JSON数据。

样本哈希(来自RSPEC帮助器):

def test_order
 {
   "id": 505311428702,
   "email": "test@gmail.com",
   "closed_at": "",
   "discount_codes": {
      "id": 507328175,
      "text": "test"
   }
 }
end

我正在使用下面的递归函数:

def to_recursive_ostruct(hash)
  OpenStruct.new(hash.each_with_object({}) do |(key, val), memo|
    memo[key] = val.is_a?(Hash) ? to_recursive_ostruct(val) : val
  end)
end

对于to_recursive_ostruct(test_order),将返回:

<OpenStruct id=505311428702, email="test@gmail.com", closed_at="", ...>

使用 OpenStructObject.marshal_dump 进行转换后:

{
:id=>505311428702, :email=>"test@gmail.com", :closed_at=>"", 

discount_codes=>#<OpenStruct id=507328175, text= "test">}
}

OpenStructObject.marshal_dump 在第一级为我提供了正确的数据

我还希望转换嵌套数据。

我真正需要的是:

{:id=>505311428702, :email=>"test@gmail.com", :closed_at=>"", :discount_codes=>{:id=>507328175, :text=> "test"} }

请帮助,谢谢。

5 个答案:

答案 0 :(得分:2)

签出docs

您可以使用OpenStruct#marshal_dump

<div>
 {/* item is object with user's name and its other details on it */}
  {items.map((item, index) => {
   return <div key={index}>
--note the name property is primitive--->{item.name}</div>;
  })}
</div>

OpenStruct#to_h也将起作用:

#include<stdio.h>

static const char *test(void){
    const char *a = NULL;
    char b[64] = {0,};
    a = b;
    return a;

}

int main() {
   const char *a;
   a = test();
}

您可以将对象转换为哈希,然后将其转换为JSON:

openstruct_object.marshal_dump

但是看起来您想要的是一个Hash对象,而不是JSON对象。

答案 1 :(得分:1)

要将深层openstruct转换为哈希,可以遵循以下几条原则:

def deep_openstruct_to_hash(object)
  object.each_pair.with_object({}) do |(key, value), hash|
    hash[key] = value.is_a?(OpenStruct) ? deep_openstruct_to_hash(value) : value
  end
end

然后:

openstruct_object = to_recursive_ostruct(test_order)
#=> #<OpenStruct id=505311428702, email="test@gmail.com", closed_at="", discount_codes=#<OpenStruct id=507328175, text="test">>
deep_openstruct_to_hash(openstruct_object)
# {
#   :id=>505311428702,
#   :email=>"test@gmail.com",
#   :closed_at=>"",
#   :discount_codes=>{
#     :id=>507328175,
#     :text=>"test"
#   }
# }

答案 2 :(得分:0)

也感谢这个gist: 也可以转换为哈希数组。

def recursive_ostruct(object)
  case object
  when Hash
    hash = {}; object.each{|k,v| hash[k] = recursive_ostruct(v)}
    OpenStruct.new(hash)
  when Array
    object.map {|e| recursive_ostruct(e) }
  else
    object
  end
end

答案 3 :(得分:0)

在Ruby 2.4+上,您可以在猴子补丁中将transform_values与递归函数一起使用。

class OpenStruct
  def deep_to_h
    to_h.transform_values do |v|
      v.is_a?(OpenStruct) ? v.deep_to_h : v
    end
  end
end

或者如果您不想猴子打补丁

def deep_to_h(obj)
  obj.to_h.transform_values do |v|
    v.is_a?(OpenStruct) ? deep_to_h(v) : v
  end
end

答案 4 :(得分:0)

以@ Andrey-Deineko,@ owyongsk,@ aldrien.h完成的工作为基础,这里是一个处理数组的转换器。尽管OP并没有特别注意,但其他人可能会发现它很有帮助。


def openstruct_to_h(object)
   object.to_h.transform_values do |value|
      value.is_a?(OpenStruct) ? openstruct_to_h(value) : value.is_a?(Array) ? value.map{|v| v.is_a?(String) ? v : openstruct_to_h(v) } : value
   end
end

# Example usage

open_struct_object = OpenStruct.new(paramtest: "ok", array_test: [OpenStruct.new(array_one: true), OpenStruct.new(array_two: false, nested_os: OpenStruct.new(works: 'maybe'))], os_test: OpenStruct.new(testy: "yup")) 

openstruct_to_h(open_struct_object)

=> {:paramtest=>"ok", :array_test=>[{:array_one=>true}, {:array_two=>false, :nested_os=>{:works=>"maybe"}}], :os_test=>{:testy=>"yup"}}