Mongoose + Expressjs - E11000 duplicate key error index? - node.js

Question

I don't understand why I got this error below after adding the first entry:
E11000 duplicate key error index: mydb.datasets.$id_1 dup key: { : null }
I don't have any null value in my first entry:
{
"index" : "9IPZMW7IL",
"name" : "Tweets",
"owner_name" : "xxx",
"read_key" : "fb6f9125f4ca15c33fea89416c3351d1",
"write_key" : "d8a6c7e5fc73b5a91aa7a533565ed1f1",
"data" : {
"var1" : {
"name" : "particles"
}
},
"_id" : ObjectId("57729dc20cb70952424cdbb4"),
"created_at" : ISODate("2016-06-28T15:54:42.576Z"),
"entries_number" : 0,
"public" : true,
"__v" : 0
}
Below is my code:
// CRUD API:
// POST/ Create new dataset request
router.post("/", helper.authenticate, function(req, res) {
// Used to set the dataset owner
var sessionUser = req.session.user.name;
// Get values from the post request
var name = req.body.name;
var isPublic = req.body.public != undefined ? true:false;
// Delete the values from the request body so that we only keep information about the variables
delete req.body.name;
delete req.body.public;
// This is so that we can loop through the object in reverse order
// We do that so that the fields are saved in the right order on the db
// (this way it will appear in the right order on the 'edit' view)
var propertiesList = [];
for (var property in req.body) {
if (req.body.hasOwnProperty(property)) {
propertiesList.push(property);
}
}
propertiesList.reverse();
var variablesFields = {};
for (var i in propertiesList) {
console.log(propertiesList[i])
variablesFields[propertiesList[i]] = {name:req.body[propertiesList[i]],
values: Array};
}
// Create dataset
Dataset.create({
index: helper.uniqueIndex(),
name: name,
owner_name: sessionUser,
read_key: hat(),
write_key: hat(),
public: isPublic,
data: variablesFields
}, function(err, dataset) {
if (err) {
console.log("Error creating the dataset: " + err);
req.session.error = "A problem occured when creating the dataset. Please try again.";
} else {
console.log("New dataset created with id: " + dataset._id);
req.session.success = "Dataset " + name + " created successfully.";
}
res.redirect("/index");
});
});
Error:
Error creating the dataset:
WriteError({"code":11000,"index":0,"errmsg":"E11000 duplicate key
error index: mydb.datasets.$id_1 dup key: { : null
}","op":{"index":"2IPZMWHGI","name":"PM
2","owner_name":"xxx","read_key":"fc31c152aa86070252c70c0304e4ca5c","write_key":"238110753c8762ce4a547fa02100a299","data":{"var1":{"name":"particles"}},"_id":"57729dcf0cb70952424cdbb5","created_at":"2016-06-28T15:54:55.459Z","entries_number":0,"public":true,"__v":0}})
Model:
var datasetSchema = new mongoose.Schema({
index: {type: String, required: true, index: {unique: true}},
name: {type: String, required: true},
owner_name: {type: String, required: true},
read_key: {type: String},
write_key: {type: String},
public: {type: Boolean, default: false},
data: {type: Object},
entries_number: {type: Number, default: 0},
created_at: {type: Date, default: Date.now},
last_entry_at: {type: Date}
});
Any idea why and how I can fix this?

Answer 1

I solved it by removing a "id" key that I initially declared as
id: { type: String, unique: true, required: true},
I removed this line and deleted the initial collection and that solved the issue.