Saving Array of Obj in Mongoose

Question

I have an Express endpoint that you can POST to that looks like:

router.post("/add", (req, res) => {
  Poll.create({
    question: req.body.question,
    options: req.body.options,
  }).then(p => {
    res.send(p);
  });
});

This is what I am trying to POST:

{
    "question": "what is your favourite colour?",
    "options" : 
    [
    {
        "colour" : "green",
        "votes" : 5
    },
    {
        "colour": "red",
        "votes": 50
    }
    ]
}

The response I am receiving is:

{
    "__v": 0,
    "question": "what is your favourite colour?",
    "_id": "59fe97088687d4f91c2cb647",
    "options": [
        {
            "votes": 5,
            "_id": "59fe97088687d4f91c2cb649"
        },
        {
            "votes": 50,
            "_id": "59fe97088687d4f91c2cb648"
        }
    ]
}

For some reason the "colour" key is not being captured. I confirmed this by viewing the collection in Mongo, and indeed there is only "votes" captured and no colours.

And just in case it helps here is the Model Schema:

const PollSchema = new Schema({
  question: {
    type: String,
  },
  options: [
    {
      option: {
        type: String,
      },
      votes: Number,
    },
  ],
});

Hardly an "unknown reason". You quite simply have not defined "color" in the schema. So it's being removed. You called it "option" instead. — Neil Lunn
– Neil Lunn, Commented Nov 5, 2017 at 4:50

TGrif · Accepted Answer · 2017-11-05 12:34:43Z

1

If you need to save properties that you do not have planned in your schema, you can add the
{ strict: false } option to it. This way, the properties will be saved.

const PollSchema = new Schema({
  // ... your schema
}, { strict: false });

But if you know that the property will always the same, it's best to add it to your schema definition.

const PollSchema = new Schema({
  question: String,
  options: [
    {
      colour: String,
      votes: Number
    }
  ]
});

answered Nov 5, 2017 at 12:34

TGrif

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1 Comment

Musa Over a year ago

That was it, my option: String is dynamic depending on the Poll options, adding strict:false let me save. Cheers!

Michael Chen · Accepted Answer · 2017-11-05 04:53:16Z

0

It is because you did not add "colour" to the schema. So Mongoose? will ignore "colour", therefore it will not be on your DB.

answered Nov 5, 2017 at 4:53

Michael Chen

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