猫鼬使用save（）方法不会保存文档

Question

I have this schema:

var UserSchema = mongoose.Schema({
    analytic: {
      type: Object, 
      default: {
        today:[],
        weekly:[],
        monthly:[],
        yearly:[],
        allTime:[]
      }
    }
});

let User = mongoose.model("bloger", UserSchema);
module.exports = {User};

and I am trying to save some data into one of the arrays like so:

    User.findOne({username:username}, (e, user) => {
        if (e) {
            res.send('error fetching post')
        }
        else if (!user) {
            res.send('no user found')
        }
        else if (user) {
            user.analytic.today.push(req.body.visitor) // push the data object to the array
            user.save((e, doc) => {
                if (e) {
                    res.send(e)
                } 
                if (doc) {
                     console.log('user saved')
                    res.send(doc)
                }
            })
        }
    })
}) 

I am getting the doc object on save() and not the e so I though it should have save it but it wasn't.

Answer 1

I have had a similar issue before this is because I am not defining a new Model I am just passing a JSON object.

Instead of saving the object you need to create a new model and save that.

Try creating a new model passing the save into it like below;

var newUser = new User(user);
newUser.save((e, doc) {
    if (e) {
       res.send(e)
    } 
    if (doc) {
        console.log('user saved')
        res.send(doc)
    }
});

Making sure you require the User Model inside the script.

Answer 2

Performing deep modifications in objects not in your schema makes Mongoose oblivious to those changes, preventing it from knowing what to save (and from making efficient atomic updates). The end result is that, when calling .save , Mongoose thinks there's nothing modified and therefore does nothing.

In your particular scenario, you have two options:

1. Add your analytics sub-arrays to your schema

This is the best option and allows for finer control of everything:

const UserSchema mongoose.Schema({
  analytic: {
    today: [{}],
    weekly: [{}],
    monthly: [{}],
    yearly: [{}],
    allTime: [{}],
  }
});

With this, those arrays are now known to Mongoose and everything should work correctly.

Note that you don't need defaults in this case, as Mongoose is smart enough to create the arrays as needed.

2. Manually mark modified object as modified

If for any reason you don't want or can't modify the schema, you can manually mark the analytic object as modifies so Mongoose knows of it:

user.analytic.today.push(req.body.visitor) // push the data object to the array
user.markModified('analytic'); // mark field as modified
user.save(...);

This signals Mongoose that analytic or any of its children have changed and triggers an update when calling .save . Note however that Mongoose views this as a full change in the object, while with option 1 it can use $push instead.