合并Java共享密钥上的多个数组

Question

I want to merge multiple arrays into one big array with shared keys.

What I've tried:

var conditions = [];
if( aa != undefined )
{
    conditions.push( { "query" : { "must" : {  "aa" : "this is aa" } } } );
}

if( bb != undefined )
{
    conditions.push( { "query" : { "must" : {  "bb" : "this is bb" } } } );
}

The above code is giving:

[
    {
        "query": {
            "must": {
                "aa": "this is aa"
            }
        }
    },
    {
        "query": {
            "must": {
                "bb": "this is bb"
            }
        }
    }
]

But I need this:

[
    {
        "query": {
            "must": [
                {
                    "aa": "this is aa"
                },
                {
                    "bb": "this is bb"
                }
            ]
        }
    }
]

I am able to do it with PHP but I need to do it in native javascript or using underscore.js

Answer 1

Define the object your pushing - push everything to the inner array first - then push the object to the outer array:

var conditions = [];
var query = { query: {} };
if( aa != undefined ) {
    if (!query["query"]["must"]) {
        query["query"]["must"] = [];
    }
    //conditions.push( { "query" : { "must" : {  "aa" : "this is aa" } } } );
    query["query"]["must"].push({  "aa" : "this is aa" });
}

if( bb != undefined ) {
    if (!query["query"]["must"]) {
        query["query"]["must"] = [];
    }
    //conditions.push( { "query" : { "must" : {  "bb" : "this is bb" } } } );
    query["query"]["must"].push({  "bb" : "this is bb" });
}

conditions.push(query);

Answer 2

It's not quite trivial, because I see you want to make an array out of the last inner property.

Do those Objects you push into the conditions array already exist or are you defining them yourself?

You can solve your problem with a recursive function like this I believe:

EDIT: The code produces the exact result you wanted now.

var object1 = {
    query: {
        must: {
            aa: "this is aa"
        }
    }
}

var object2 = {
    query: {
        must: {
            bb: "this is bb"
        }
    }
}

var conditions = {};

function mergeObjects(object, parentObject){
    for(var prop in object){
        if(parentObject.hasOwnProperty(prop)){
            if(typeof parentObject[prop] === "object" && shareProperties(parentObject[prop], object[prop])){
                mergeObjects(object[prop], parentObject[prop])
            }else{
                parentObject[prop] = [parentObject[prop], object[prop]];
            }
        }else{
            parentObject[prop] = object[prop];
        }   
    }
}

function shareProperties(obj1, obj2){
    for(var prop in obj1){
        if(obj2.hasOwnProperty(prop)){
            return true;
        }
    }
    return false;
}

mergeObjects(object1, conditions);
mergeObjects(object2, conditions);

Output:

"{"query":{"must":[{"aa":"this is aa"},{"bb":"this is bb"}]}}"

Answer 3

For each descendant of conditions , check if it exists, create it if it doesn't.

Then, finally, push your new object:

 function addCondition(conditions, key, value) { conditions[0] = conditions[0] || {}; conditions[0].query = conditions[0].query || {}; conditions[0].query.must = conditions[0].query.must || []; var o = {}; o[key] = value; conditions[0].query.must.push( o ); } var conditions = []; var aa = 1, bb = 1; if (typeof(aa) !== 'undefined') addCondition(conditions, "aa", "this is aa" ); if (typeof(bb) !== 'undefined') addCondition(conditions, "bb", "this is bb" ); if (typeof(cc) !== 'undefined') addCondition(conditions, "cc", "this is cc" ); document.getElementById('results').innerHTML = JSON.stringify(conditions, null, 2); 

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