node.js - Why does Mongodb update work but mongoose doesn't? -

when query monodb shell, able update document. mongodb command use: db.users.update({name:"bob"}, {$set: {email:"newemail@gmail.com} })

but when try update mongoose, doesn't work. missing??

this code in mongoose:

// create users schema

var userschema = mongoose.schema({   name: string,   email: string }, {collection: "users"}); 

// create model

var usermodel = mongoose.model("usermodel", userschema); 

// update document

usermodel.update({name:"bob"}, {$set: {email:"newemail@gmail.com"}} ); 

you should wait callback see if operation succesful or not

usermodel.update({ name: "bob" },                   {$set: { email:"newemail@gmail.com" }},                  function (err, user) {                      if (err) return handleerror(err);                      res.send(user);                  }); 

the mongoose working asynchronously, should wait response in callback. there synchrone way node not recommended block stack.