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Manolait
Asked: 2020-04-24 03:38:57 +0800 CST 2020-04-24 03:38:57 +0800 CST

Generate Array with multiple objects

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I am trying to generate an Array with an object structure inside it with the following structure:

var valores = [{ name: 'MongoDB', type: 'float', value: 25,{ name: 'MongoDB', type: 'float', value: 5 },{ name: 'MongoDB', type: 'float', value: 2 }];

I get the following structure in my Rest API:

{
  "subscriptionId" : "5a268a598dc68904bbc7b3cf",
  "originator" : "localhost",
  "contextResponses" : [
  {
    "contextElement" : {
      "type" : "Temperatura",
      "isPattern" : "false",
      "id" : "S_Temp001",
      "attributes" : [
        {
          "name" : "Tem_int",
          "type" : "float",
          "value" : 2,
          "metadatas" : [
            {
              "name" : "accuracy",
              "type" : "Float",
              "value": 2              }
          ]
        },
        {
          "name" : "Tem_out",
          "type" : "Integer",
          "value" : 1,
          "metadatas" : [
            {
              "name" : "Timestap",
              "type" : "Integer",
              "value": 33              }
          ]
        }
      ]
    },
    "statusCode" : {
      "code" : "200",
      "reasonPhrase" : "OK"
    }
  }
  ]
  }

I have to process this data in my Back-end to generate the structure already mentioned above.

The way I am trying to generate my Array is as follows:

    var params = req.body;
     var tmp2 = [];
     for (var i = 0; i < params.contextResponses.length; i++) {
       for (var j = 0; j < params.contextResponses[i].contextElement.attributes.length; j++) {
         for (var k = 0; k < params.contextResponses[i].contextElement.attributes[j].metadatas.length; k++) {
           //console.log("nuevo log antes de petar: " + params["contextResponses"][i].contextElement.attributes[j].metadatas[k].value);

           tmp2.push('{' + //paramsheadersFiware_Service,
params.contextResponses[i].contextElement.attributes[j].name,
                    params.contextResponses[i].contextElement.attributes[j].type,
                    params.contextResponses[i].contextElement.attributes[j].value

                    + '}');
         }
       }
   }
   console.log("tmp2 --> ",tmp2);

Looping through the structure and then pushing to the new array.

The answer I get is the following:

[ '{Tem_int', 'float', '2}', '{Tem_out', 'Integer', '1}' ]

As you can see the format is not correct, I need the labels before the values ​​I have tried concatenating before the Push but it does not work well and the '' are wrongly placed they should go inside {''} How can I solve this problem ?

The objective is to save multiple documents in MongoDB according to the initial format that I have commented.

I honestly don't know if there is a better way to save in MongoDB, but the idea is to save my Array of objects and each object is a document.

javascript

1 Answers

  1. Best Answer

    It seems to me that if you want your array to be of objects, you should create the elements like that, objects . You are adding them as string.

    So, in the part of your code where you add these elements, you could try something like this:

       var obj = {
      name : params.contextResponses[i].contextElement.attributes[j].name, 
      type: params.contextResponses[i].contextElement.attributes[j].type,
      value: params.contextResponses[i].contextElement.attributes[j].value 
   };
   tmp2.push(obj);

    By the way, and just as a suggestion, every time you enter a for, you could assign the element to traverse to a variable (local to the cycle) with a shorter name, hehehe, so that the code doesn't get so cluttered ^^ (also you can use foreach, which allows you to do the same thing).

    • 3