Mongo数据库设置不起作用

Question

I'm trying to update a user object in my database using mongodb and mongoose. Here's the schema:

const userSchema = new schema({
    username: String,
    password: String,
    firstName: String,
    lastName: String,
    age: Number,
    ticketsPurchased: [{name: String, date: Date, link: String}],
    admin: Boolean,
    billingAddress: String,
    cityResiding: String,
    stateResiding: String,
    creditCard: String,
});

Here's my code trying to update it:

socket.on("changeUserInfo", function(data){
    console.log("CHANING USER INFO");
    console.log(data);

    User.update({username: data.username}, {
        $set: {
            firstName: data.firstname,
            lastName: data.lastName,
            billingAddress: data.billingAddress,
            creditCard: data.creditCard,
            stateResiding: data.stateResiding
        }
    });

    User.find({username: data.username}, function(err, user){
        if (err) console.log(err);
        else {
            console.log("USER = " + user);
        }
    });
});

The data is correct, it outputs correctly but when I output user in the User.find it remains un-updated.

Answer 1

Database operations are asynchronous - you need to provide a callback function or wait a Promise to be resolved in order to be sure about the order of operations.

In your case the find() method will most likely return the data before the update() operation has finished.

Here is how to acheive what you want - display the updated user:

User.update(
  { username: data.username },
  {
    $set: {
      firstName: data.firstname,
      lastName: data.lastName,
      billingAddress: data.billingAddress,
      creditCard: data.creditCard,
      stateResiding: data.stateResiding
    }
  }
)
  .exec()
  .then(() => {
    // you can now be sure that the update has already completed
    User.find({ username: data.username }, function(err, user) {
      if (err) console.log(err);
      else {
        console.log("USER = " + user);
      }
    });
  })
  .catch(error => {
    // do not forget to handle errors
  });

Answer 2

Try this: Use the '{new:true}' of the 'findOneAndUpdate()'. This will send you the data after changes have been made. Hope this helps!

    User.findOneAndUpdate({username:data.username},{$set:
    {
     firstName: data.firstname,
      lastName: data.lastName,
      billingAddress: data.billingAddress,
      creditCard: data.creditCard,
      stateResiding: data.stateResiding
    }
    }, {new:true},
    (err,docs)=>{
    //do something here
    }
    )