从JSON数组中查找和删除JSON对象

Question

I have a JSON Object something like this below :

   var users =  {
      ross: [
        {
          socket_id: 'K7XhUcIXAQFkmhK7AAAA',
          community_id: 2
        },
        {
          socket_id: 'gWBy0adi2e3KoIWuAAAC',
          community_id: 2
        },
        {
          socket_id: 'PRQ2czNZuvatsy8cAAAD',
          community_id: 2
        },
        {
          socket_id: 'R-EGVCDc5jWQV50KAAAF',
          community_id: 2
        }
      ],
      laura: [
        {
          socket_id: 'VCp2NxY42LMNvOclAAAE',
          community_id: 2
        },
        {
          socket_id: 'MDZe6Oe8U4xzmUjxAAAG',
          community_id: 2
        }
      ],
      john: [
        {
          socket_id: 'Omn3VQKyuYHm2JNdAAAH',
          community_id: 2
        }
      ]
    }

Now when socket is disconnected, I want to delete that socket object from that user's array. Now I have written a function to delete the Json Object from Json array.

var cleaner= function(arr, id) {
            for (var i = 0; i < users.length; i++) {
                var cur = users[i];
                if (cur.id === id) {
                    arr.splice(i, 1);
                    break;
                }
            }
        };
cleaner(users, socket.id);

The only problem with above funtion is that I need to pass the name of the key to which that JSON Array is of.

Basically, first I want to find the name of the key of that JSON Array and when I will get the key name I will pass it to cleaner function . But I don't know how to find the name of the key of the JSON Array.

Answer 1

With the given structure, you need to iterate over the keys of the object and then over the arrays inside.

 var users = { ross: [{ socket_id: 'K7XhUcIXAQFkmhK7AAAA', community_id: 2 }, { socket_id: 'gWBy0adi2e3KoIWuAAAC', community_id: 2 }, { socket_id: 'PRQ2czNZuvatsy8cAAAD', community_id: 2 }, { socket_id: 'R-EGVCDc5jWQV50KAAAF', community_id: 2 }], laura: [{ socket_id: 'VCp2NxY42LMNvOclAAAE', community_id: 2 }, { socket_id: 'MDZe6Oe8U4xzmUjxAAAG', community_id: 2 }], john: [{ socket_id: 'Omn3VQKyuYHm2JNdAAAH', community_id: 2 }] }, cleaner = function (object, socket_id) { Object.keys(object).some(function (k) { return object[k].some(function (a, i, aa) { if (a.socket_id === socket_id) { aa.splice(i, 1); return true; } }); }); }; cleaner(users, 'PRQ2czNZuvatsy8cAAAD'); console.log(users); 

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More than one to delete approach with Array#filter .

 var users = { 'abc@xyz.in': [ { socket_id: '4MIPKfkcitCV9xp6AAAA', community_id: 8 }, { socket_id: '4MIPKfkcitCV9xp6AAAA', community_id: 9 } ] } , cleaner = function (object, socket_id) { Object.keys(object).forEach(function (k) { var temp = object[k].filter(function (a) { return a.socket_id !== socket_id; }); if (object[k].length !== temp.length) { object[k] = temp; } }); }; cleaner(users, '4MIPKfkcitCV9xp6AAAA'); console.log(users); 

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Answer 2

try this (replace this with your for loop):

for(var i in users)
{
     name = i;
     array = users[i]
}