CODEWITHSUNDEEP
node.jsmongodbmongoose
Amol M Kulkarni
Amol M Kulkarni

Reputation: 21639

Why should I create a json to save a document from Mongoose + MongoDB + Node.JS?

Consider, Mongoose schema:

var schema_obj = new Schema({
    field1: String,
    field2: String, .........
});

JSON document, like:

var json_obj = {
field1: 'value', 
field2 : 'val2', 
............
};

For saving I call method, like

var Model_obj = mongoose.model('model_name', schema_object);
var document_obj = new Model_obj(json_obj);
document_obj.save(function(err,data){/*some logic after save*/});

Now my question is: Why should I create a json_obj. When I already have a schema object in my hand, which already has all the fields (field1, field2). If I just want to give values for those fields why should I create json by writing all the field name again?

If I have n number of fields this becomes a overhead to write all fields again. Is there any way to avoid this overhead?

Something like I get a empty JSON object out of my defined mongoose schema, then just proceed by assigning only values?

Upvotes: 1

Views: 4681

Answers (3)

Gaurav
Gaurav

Reputation: 609

If you are using ES6, the spread operator might come in handy for this purpose. considering that you have your mongoose model defined and you are getting your field values from req.body. you can create a new object for that model by simply writing it like this:

const Thing = mongoose.model('collection_name', sch_obj); 
const json_obj = new Thing({ ...req.body });
json_obj.save()
.then(savedThing => {
    //DO things with your saved object.
})
.catch(error => {
   //Handle error in saving the object
})

Upvotes: 1

Amol M Kulkarni
Amol M Kulkarni

Reputation: 21639

The following is the best solution I have found so far

var sch_obj = new mongoose.Schema({
 "_id ": String,
 "field1": String,
 "field2": String
}, { collection: 'collection_name'});

var Mod_obj = mongoose.model('collection_name', sch_obj);

var json_obj = new Mod_obj({
"_id ": 'Strin', /*This is the only field which cannot be assigned later*/
}); 

//json_obj._id = 'some value'; /*THIS CANNOT BE DONE*/
json_obj.field1 = 'value1';
json_obj.field2 = 'value2';
json_obj.save(function (err, data) { console.log(data); });

Upvotes: 1

Michelle Tilley
Michelle Tilley

Reputation: 159125

What kind of API are you looking for? You can set properties on a model instance and save it. But I'm not sure if I understand why

var thing = new Thing();
thing.name = "The Name";
thing.priceInCents = 1999;
thing.numAvailable = 10;
thing.save();

is easier than

var thing = new Thing({name: 'The name', priceInCents: 1999, numAvailable: 10});
thing.save();

In a web app, this becomes something like

app.post('/things', function(req, res) {
  var thing = new Thing(req.body.thing);
  thing.save(function() { ... });
});

Upvotes: 3

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