I'm having trouble adding a new field to MongoDB. The database accepts my Javascript variable as data, but not as the name for the new field:
function appendInformation(question, answer) {
Sessions.update({ _id: Id }, { question : answer });
}
The correct answer is inserted, but it appears in the document as question: {answer} instead of {question} : {answer}
To update the Session document with a new field, you should utilize the $set method.
function addData(q, a) {
var info = { };
info[q] = a;
Sessions.update({ _id: Id }, { $set : info });
}
For more information on how to use $set, refer to the documentation.
> db.so.remove()
> var info={"question 1" : "the answer is 1"};
> db.so.insert(info);
> db.so.find()
{ "_id" : ObjectId("520136af3c5438af60de6398"),
"question 1" : "the answer is 1" }
> var info2={"question 2" : "the answer is 2"};
> db.so.update({ "_id" : ObjectId("520136af3c5438af60de6398")}, { $set : info2 })
> db.so.find()
{ "_id" : ObjectId("520136af3c5438af60de6398"),
"question 1" : "the answer is 1",
"question 2" : "the answer is 2" }
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