How to define object in array in Mongoose schema correctly with 2d geo index

You can declare trk by the following ways : -either

trk : [{    lat : String,    lng : String     }]

or

trk : { type : Array , "default" : [] }

In the second case during insertion make the object and push it into the array like

db.update({'Searching criteria goes here'},{ $push : {    trk :  {             "lat": 50.3293714,             "lng": 6.9389939           } //inserted data is the object to be inserted   }});

or you can set the Array of object by

db.update ({'seraching criteria goes here ' },{ $set : {          trk : [ {                     "lat": 50.3293714,                     "lng": 6.9389939                  },                  {                     "lat": 50.3293284,                     "lng": 6.9389634                  }               ]//'inserted Array containing the list of object'      }});

I had a similar issue with mongoose :

fields:     [ '[object Object]',     '[object Object]',     '[object Object]',     '[object Object]' ] }

In fact, I was using "type" as a property name in my schema :

fields: [    {      name: String,      type: {        type: String      },      registrationEnabled: Boolean,      checkinEnabled: Boolean    }  ]

To avoid that behavior, you have to change the parameter to :

fields: [    {      name: String,      type: {        type: { type: String }      },      registrationEnabled: Boolean,      checkinEnabled: Boolean    }  ]

The problem I need to solve is to store contracts containing a few fields (address, book, num_of_days, borrower_addr, blk_data), blk_data is a transaction list (block number and transaction address).This question and answer helped me. I would like to share my code as below. Hope this helps.

1. Schema definition. See blk_data.

var ContractSchema = new Schema(    {        address: {type: String, required: true, max: 100},  //contract address        // book_id: {type: String, required: true, max: 100},  //book id in the book collection        book: { type: Schema.ObjectId, ref: 'clc_books', required: true }, // Reference to the associated book.        num_of_days: {type: Number, required: true, min: 1},        borrower_addr: {type: String, required: true, max: 100},        // status: {type: String, enum: ['available', 'Created', 'Locked', 'Inactive'], default:'Created'},        blk_data: [{            tx_addr: {type: String, max: 100}, // to do: change to a list            block_number: {type: String, max: 100}, // to do: change to a list        }]    });

2. Create a record for the collection in the MongoDB. See blk_data.

// Post submit a smart contract proposal to borrowing a specific book.exports.ctr_contract_propose_post = [    // Validate fields    body('book_id', 'book_id must not be empty.').isLength({ min: 1 }).trim(),    body('req_addr', 'req_addr must not be empty.').isLength({ min: 1 }).trim(),    body('new_contract_addr', 'contract_addr must not be empty.').isLength({ min: 1 }).trim(),    body('tx_addr', 'tx_addr must not be empty.').isLength({ min: 1 }).trim(),    body('block_number', 'block_number must not be empty.').isLength({ min: 1 }).trim(),    body('num_of_days', 'num_of_days must not be empty.').isLength({ min: 1 }).trim(),    // Sanitize fields.    sanitizeBody('*').escape(),    // Process request after validation and sanitization.    (req, res, next) => {        // Extract the validation errors from a request.        const errors = validationResult(req);        if (!errors.isEmpty()) {            // There are errors. Render form again with sanitized values/error messages.            res.status(400).send({ errors: errors.array() });            return;        }        // Create a Book object with escaped/trimmed data and old id.        var book_fields =            {                _id: req.body.book_id, // This is required, or a new ID will be assigned!                cur_contract: req.body.new_contract_addr,                status: 'await_approval'            };        async.parallel({            //call the function get book model            books: function(callback) {                Book.findByIdAndUpdate(req.body.book_id, book_fields, {}).exec(callback);            },        }, function(error, results) {            if (error) {                res.status(400).send({ errors: errors.array() });                return;            }            if (results.books.isNew) {                // res.render('pg_error', {                //     title: 'Proposing a smart contract to borrow the book',                //     c: errors.array()                // });                res.status(400).send({ errors: errors.array() });                return;            }            var contract = new Contract(                {                    address: req.body.new_contract_addr,                    book: req.body.book_id,                    num_of_days: req.body.num_of_days,                    borrower_addr: req.body.req_addr                });            var blk_data = {                    tx_addr: req.body.tx_addr,                    block_number: req.body.block_number                };            contract.blk_data.push(blk_data);            // Data from form is valid. Save book.            contract.save(function (err) {                if (err) { return next(err); }                // Successful - redirect to new book record.                resObj = {                    "res": contract.url                };                res.status(200).send(JSON.stringify(resObj));                // res.redirect();            });        });    },];

3. Update a record. See blk_data.

// Post lender accept borrow proposal.exports.ctr_contract_propose_accept_post = [    // Validate fields    body('book_id', 'book_id must not be empty.').isLength({ min: 1 }).trim(),    body('contract_id', 'book_id must not be empty.').isLength({ min: 1 }).trim(),    body('tx_addr', 'tx_addr must not be empty.').isLength({ min: 1 }).trim(),    body('block_number', 'block_number must not be empty.').isLength({ min: 1 }).trim(),    // Sanitize fields.    sanitizeBody('*').escape(),    // Process request after validation and sanitization.    (req, res, next) => {        // Extract the validation errors from a request.        const errors = validationResult(req);        if (!errors.isEmpty()) {            // There are errors. Render form again with sanitized values/error messages.            res.status(400).send({ errors: errors.array() });            return;        }        // Create a Book object with escaped/trimmed data        var book_fields =            {                _id: req.body.book_id, // This is required, or a new ID will be assigned!                status: 'on_loan'            };        // Create a contract object with escaped/trimmed data        var contract_fields = {            $push: {                blk_data: {                    tx_addr: req.body.tx_addr,                    block_number: req.body.block_number                }            }        };        async.parallel({            //call the function get book model            book: function(callback) {                Book.findByIdAndUpdate(req.body.book_id, book_fields, {}).exec(callback);            },            contract: function(callback) {                Contract.findByIdAndUpdate(req.body.contract_id, contract_fields, {}).exec(callback);            },        }, function(error, results) {            if (error) {                res.status(400).send({ errors: errors.array() });                return;            }            if ((results.book.isNew) || (results.contract.isNew)) {                res.status(400).send({ errors: errors.array() });                return;            }            var resObj = {                "res": results.contract.url            };            res.status(200).send(JSON.stringify(resObj));        });    },];