help with updating records in mongodb using express-router and mongoose.

[David Cotto]

Hello i have been stuck for days with this one problem..

i do not know how to go about my problem.

i basically want to update mongodb first by finding the projectId,

and then updating bannerData for each projectId found.

my mongodb records:

Below is my mongoose/express-router path. 

i feel like i am close but if i put in req.body.bannerData i get undefined...how do i update properly?

router.route('/saveAll/:projectId')
  .put((req,res) => {
    Banner.updateMany ({ projectId: req.params.projectId }, {
        $set: { "bannerData.$[]": req.body}
      },
      function(err, response) {
        if (err) {
          res.send(err);
          console.log(err);
          console.log(req.body);
        } else {
          console.log(req.params.projectId);
          console.log(response);
          console.log(req.body);
        }
      })
  });





Below is a bannerData that i wish to push to mongodb