Find and update in nested json object without chan

问题:

This is an update to my previous question Find and update in nested json object

Sample Data

TestObj = {
    "Categories": [{
        "Products": [{
            "id": "a01",
            "name": "Pine",
            "description": "Short description of pine."
        },
        {
            "id": "a02",
            "name": "Pine",
            "description": "Short description of pine."
        },
        {
            "id": "a03",
            "name": "Poplar",
            "description": "Short description of poplar."
        }],
        "id": "A",
        "title": "Cheap",
        "description": "Short description of category A."
    },
    {
        "Product": [{
            "id": "b01",
            "name": "Maple",
            "description": "Short description of maple."
        },
        {
            "id": "b02",
            "name": "Oak",
            "description": "Short description of oak."
        },
        {
            "id": "b03",
            "name": "Bamboo",
            "description": "Short description of bamboo."
        }],
        "id": "B",
        "title": "Moderate",
        "description": "Short description of category B."
    }]
};

My Function

function getObjects(obj, key, val, newVal) {
    var newValue = newVal;
    var objects = [];
    for (var i in obj) {
        if (!obj.hasOwnProperty(i)) continue;
        if (typeof obj[i] == 'object') {
            objects = objects.concat(getObjects(obj[i], key, val, newValue));
        } else if (i == key && obj[key] == val) {
            obj[key] = newValue;
        }
    }
    return obj;
}

called as

getObjects(TestObj, 'id', 'A', 'B');

It works fine if I'm going to update id; since id don't have duplicates. But if I'm updating name all data matching key value pair is updated. But how to constrain it into a particular key-pair value.

What shall i provide to the function to constrain the update scope and how to implement it. Please help me.

Note: The json that I will b manipulating will be dynamically generated so I can't have any hard coded value in the function

回答1:

I think you can somehow use a path to locate the value and then do the update. I got the idea from this post. (answered by @shesek)

var getPath = function (obj, path, newValue) {
    var parts = path.split('.');
    while (parts.length > 1 && (obj = obj[parts.shift()]));
    obj[parts.shift()] = newValue;
    return obj;
}

console.log(getPath(TestObj, 'Categories.0.Products.1.id', 'AAA'))
console.log(TestObj)

So you can pass in the path to the object, for example, if you want to update the id of the following object to "AAA", you can pass in Categories.0.Products.1.id

    {
        "id": "a02",
        "name": "Pine",
        "description": "Short description of pine."
    }

then, the object will become

    {
        "id": "AAA",
        "name": "Pine",
        "description": "Short description of pine."
    }

Hope it can shed some light on!