Mongoose MongoError : 11000 - node.js

Question

I sent a create post signal through Postman. a once time, the post signal was a successfully. but next time it was failed . error message is like this.
Error creating new record : {
"driver": true,
"name": "MongoError",
"index": 0,
"code": 11000,
"keyPattern": {
"RoutineParts.userId": 1
},
"keyValue": {
"RoutineParts.userId": null
}
}
i cant understand the error message,
my post code and user model code is like that ,
// it's post code.
router.post('/',(req,res)=>{
const newRecord = User ({
username : req.body.username,
email : req.body.email,
password : req.body.password
})
newRecord.save((err,docs)=>{
if(!err) {
res.send(docs)
}else {
console.log('Error creating new record : ' + JSON.stringify(err,undefined,2))
}
})
})
// it's user model
const mongoose = require('mongoose')
const userSchema = new mongoose.Schema(
{
username : {type:String},
email: { type: String, required: true},
password: { type: String, required: true, trim: true },
created_at : { type: Date, default: Date.now },
updated_at : { type: Date, default: Date.now },
}
)
const User = mongoose.model('User', userSchema);
module.exports = { User }
i can't understand. In fact 'RoutineParts' is a one of model, but i didn't write user's documents. and, controller path is corrected in app.js
how can i solve it?
it's RoutineParts model
const mongoose = require('mongoose')
const userSchema = new mongoose.Schema(
{
routine_name : {type:String},
userId : { type: String, required: true},
exercise_name : { type: String},
order : { type: Number},
}
)
const RoutineParts = mongoose.model('RoutineParts', userSchema);
module.exports = { RoutineParts }
and it's app.js contents
// Connecting data to the MongoDB through Mongoose
require('./db')
const express = require('express')
const app = express()
const PORT = 5000
const bodyParser = require('body-parser')
const userRoute = require('./controller/user')
const routineRoute = require('./controller/routine')
const RP_Route = require('./controller/routineParts')
const EX_Route = require('./controller/excersise')
app.use(bodyParser.json())
app.get("/", function (req, res) {
res.status(201).send("<h1>Hey guys! Hello World !!</h1>");
});
app.listen(PORT, function () {
console.log(`start express server on port ${PORT}`);
});
app.use('/Users', userRoute)
app.use('/Routine', routineRoute)
app.use('/Excersise', EX_Route)
app.use('/RoutineParts', RP_Route)

Answer 1

What's going on
I took a look at your full code. The only real problem, which also fits with the error message you are seeing, is the following :
In your ./models/routineParts.js you've set a unique field. In your case userid. E.g. if your create a new routineParts document with userid "AAA" you can not create another document with the same userid "AAA". In short this means, every user can only create 1 single routineParts document.
The first time you did a POST request to your route localhost:5000/RoutineParts it created the first routineParts document. After that, every request will fail, because it already created 1 routineParts document. ( Read here about unique index with mongoose )
See your ./controller/routineParts.js . If you try to do the same request with a different userid it should work.
How to fix
1 : Remove unique: true from your ./models/routineParts Schema.
2 : ⚡ Drop the index . Mongoose most-likey already registered this index and you have to drop it specifically. Otherwise it will always treat the userid field as unique.
3 : You are still in development, so it shouldn't hurt to also drop the RoutineParts collection.
4 : Restart the app and try to hit the POST localhost:5000/RoutineParts endpoint a couple of times. You now should be able to create multiple routineParts documents under the same user.
How to drop the index
That's a different story. This question should help you with that. They are also using mongoose. If your are using the latest version of mongoose there is a method called cleanIndexes. Use this method after you've removed the unique:true from your model.

Answer 2

For solve this isuse you must remove index duplicate email_1 from index menu