存储数组值中的Javascript错误

Question

output of

result[0].brand_id  = ["59df686fe30af41be049417f","59df68eca39cf51b40c566ab"]

and i want to store the value find by these id in single storage 'brand'

and my code is

    var data = {};
    data['brands'] = [];

    async.each(result[0].brand_id, function (brand,callback) {

        Brand.findById(brand,function(err,result){
            if(err){
                callback("there is an error");
            }
            //console.log(result.brand_name);
            data['brands'] = {
                brand: result.brand_name,
                dosage: result.dosage_id
            };
            console.log(data); // it is correct but but shows two single storage
        });
        callback();
    },function (err,data) {
        if(err){
            console.log(err);
        }
        console.log(data); // it show output undefined
    });

I want my output as

    { brands: 
   [ { brand: 'a', dosage: ["59df686ee30af41be049417e"] },
     { brand: 'b', dosage: ["59df68eca39cf51b40c566aa"] } ] }

I am stuck here,please solve this.

Answer 1

You'll have to create data['brand'] as an array and will have to push in values inside it.

A sample solution:

if(!data['brand']) data['brand'] = []; // to check if it is the first time you are inserting inside data['brand'], in which case it needs to be initialized.
data['brand'].push({
            brand: result.brand_name,
            dosage: [result.dosage_id]
        });