What is the best way to retrieve a JSON element obtained from a Parse.com query?

I'm encountering difficulties when attempting to access a specific JSON element that I receive in response from a query made into a Parse.com Class.

Despite reading through various questions and answers on similar topics, I have yet to find a solution.

Below is the code snippet for my query:

Parse.Cloud.define("todoenuno", function(request, response) {

    var User = Parse.Object.extend("_User");
    var query = new Parse.Query(User);
    query.equalTo("TipoUsuario", {"__type": "Pointer", "className": "Tipo_de_Usuario", "objectId": "UgTuNHEQEZ"}); 
    query.find({
        success: function(results) {
            response.success(results[0]);
        },
        error: function(error) {
            alert("Error: " + error.code + " " + error.message);
            response.error('Request failed with response code ' + error.status);
        }
    });
});

When I call the function todoenuno(), I receive the following JSON object:

{
  "result": {
    "Apellido": "Galli",
    "Nombre": "Gabriel",
    "NombreSede_FK": {
      "__type": "Pointer",
      "className": "Sedes",
      "objectId": "JNMeQHySaD"
    },
    ...
    // As per the original text
   ...
  }
}

Although the query results are correct, I am struggling to extract individual elements from it.

For instance, I want to retrieve the value "Galli".

I attempted methods like:

response.success(results[0].Apellido); //or response.success(results[0]["Apellido"];

Unfortunately, these returned an empty JSON object.

If I try:

response.success(results.result.Apellido);

I encounter an error stating "Can't read 'Apellido' from undefined..."

As a beginner programmer, I apologize if this question seems trivial, but despite extensive research, I have been unable to find a suitable solution among similar discussions.

Thank you in advance for your assistance, and pardon my limited English proficiency!

Answer №1

Assuming the JSON data is stored in results[0], you can access the property "Galli" like this:

results[0].result.Apellido

UPDATE: According to the official documentation, results[0] represents a Parse.Object, so you should use the get() method instead:

results[0].get('Apellido')

Answer №2

Here is a handy function to retrieve the desired attribute by its index:

function getAttributeByIndex(obj, index){
  var count = 0;
  for (var key in obj){
    if (index === count){
      return obj[key];
    }
    count++;
  }
  return null;
}
console.log(getAttributeByIndex(response, 0));

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