在对象结构中从其子对象获取父对象

Question

I have an object which looks something like this:

{
"11": {
    "id": 11,
    "parent_product": 0,
    "product_name": "WebStore",
    "product_price_city": null,
    "child": {
      "12": {
        "id": 12,
        "parent_product": 11,
        "product_name": "WebStore - Single",
        "product_price_city": 500
      },
      "13": {
        "id": 13,
        "parent_product": 11,
        "product_name": "WebStore - Full",
        "product_price_city": 2500
      }
    }
  }
}

Here, the key 11 has two childs: 12 and 13 .

In a different object which looks like this:

{
  "316": 
    {
      "id": 316,
      "product_id": 13,
      "sold_by": 1,
      "product_price": 5000,
      "subscription_month": 3,
      "updated_by": 0,
      "created_at": 1449573556
    },
  "317":
    {
      "id": 317,
      "product_id": 12,
      "sold_by": 1,
      "product_price": 5000,
      "subscription_month": 3,
      "updated_by": 0,
      "created_at": 1449573556
    }
}

I here the product_id is either 12 or 13, that is it will always be a child.

I need to get the parent id of 12 and 13, so I can access they the first object.

data.11

How can I get it in JavaScript?

Answer 1

Just get the properties and iterate over it.

 var object1 = { "11": { "id": 11, "parent_product": 0, "product_name": "WebStore", "product_price_city": null, "child": { "12": { "id": 12, "parent_product": 11, "product_name": "WebStore - Single", "product_price_city": 500 }, "13": { "id": 13, "parent_product": 11, "product_name": "WebStore - Full", "product_price_city": 2500 } } }, "15": { "id": 15, "parent_product": 0, "product_name": "WebStore", "product_price_city": null, "child": undefined }, "17": { "id": 17, "parent_product": 0, "product_name": "WebStore", "product_price_city": null } }, key; function getParent(id, object) { var k; Object.keys(object).some(function (a) { if (object[a].child && id in object[a].child) { k = a; return true; } }); return k; } document.write(getParent('12', object1) + '<br>'); // '11' key = getParent('42', object1); if (typeof key === 'undefined') { document.write('no key found'); }