Answers for "mongoose delete a document"

mongoose find by and delete

Campground.findByIdAndRemove(req.params.id, function(err){
      if(err){
          res.redirect("/campgrounds");
      } else {
          res.redirect("/campgrounds");
      }
   });

delete document mongoose

Tank.deleteOne({ size: 'large' }, function (err) {
  if (err) return handleError(err);
  // deleted at most one tank document
});