delete field in mongoose code example

Example 1: mongoose delete property

User.collection.update({_id: user._id}, {$unset: {field: 1 }});

Example 2: mongoose find by and delete

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