Mongoose 无法将“”的属性设置为未定义，每当我尝试创建新条目时。即使模式被声明为正确

Question

im building a support portal webiste.Where i have to record which user is raising the ticket. Im using passport so i can get the username and _id through req.user.Im using express and MongoDB Atlas as my database.I have saved my database schemas on a seaparate folder called models. Here is the schema file:

   const mongoose=require("mongoose");

const supportSchema=new mongoose.Schema({
    type:String,
    comment:String,
    date:String,
    status:String,
    author:{
        id:{
            type:mongoose.Schema.Types.ObjectId,
            ref:"User"
        },
        username:String
    }
})

module.exports=mongoose.model("Support",supportSchema);

and here is the express side of things:

    //posting support to admin
app.post("/admin/support",isLoggedIn,function(req,res){
    const data={
        type:req.body.type,
        comment:req.body.comment,
        status:"Pending"
    }
    Support.create(data,function(err,newsupport){
        console.log(req.user);
        if(err){
            console.log(err);
        }else{
            //add username and id to ticket
             Support.author.id=req.user._id;
             Support.author.username=req.user.username;
            // save ticket
            Support.save();
            res.redirect("/home");
        }
    })
})

As we can see in the schema above, i have defined author and inside author i have defined id.Im running into a error whenever im trying to create a ticket.It tells me "Cannot set property 'id' of undefined". I even crosschecked by console logging req.user(which im able to access inside the route).

I have required the schema in app.js

const Support=require("./models/newsupport");

PS:name of the file is newsupport. i have configured mongodb connection like so:

mongoose
.connect('mongodb+srv://saidarshan:R@mb02501@cluster0-wjhf4.mongodb.net/project?retryWrites=true&w=majority', {
    useNewUrlParser: true,
    useCreateIndex: true,
    useFindAndModify: false,
    useUnifiedTopology: true
})
.then(() => {
    console.log('Connected to DB');
})
.catch((err) => {
    console.log('ERROR', err.message);
});

Please help me out with this.Thank you

Answer 1

I'm not seeing where there is a new variable for the Support constructor to live while you're working on it. Try something like let newTicket = Support.create(... and then set newTicket.author.id , etc.

Answer 2

The Schema is declared right, but the you are trying to save author (subdocument) on the Schema itself, and not an actual document.

    Support.author.id=req.user._id;
    Support.author.username=req.user.username;
    // save ticket
    Support.save();

You want to perform that save on the newly created document , and not the Schema. Like this:

app.post("/admin/support",isLoggedIn,function(req,res){
    const data={
        type:req.body.type,
        comment:req.body.comment,
        status:"Pending"
    }
    Support.create(data,function(err,newsupport){
        console.log(req.user);
        if(err){
            console.log(err);
        }else{
            //add username and id to ticket
             newsupport.author.id=req.user._id;
             newsupport.author.username=req.user.username;
            // save ticket
            newsupport.save();
            res.redirect("/home");
        }
    })
})

Of course, another options will be to combine all the objects (document and the subdocument) together and do it all in one save so you can save yourself from having two queries to perform one task.

const data={
        type:req.body.type,
        comment:req.body.comment,
        status:"Pending",
        author: {
            id: req.user._id,
            username: req.user.username
        }
    }

And you can just pass it to the Support.create and never bother about calling save method again on the created document.