Trying to post data to MongoDB, get status code 200 but fail to post data - mongodb

Question

I am a newbie to programming.
Now, I am working on a MERN stack project, trying to post data to my mongoDB database, but failed after many attempts.
Database:
There are 2 collections, 'items' and 'users' in the same database. The schemas are as follows:
Item Schema:
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
// Create Schema
const ItemSchema = new Schema(
{
entryDate: {
type: Date,
required: true
},
leaveDate: {
type: Date,
required: true
}
},
{
collection: 'items'
}
);
module.exports = Item = mongoose.model('Item', ItemSchema);
User Schema:
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
// Create Schema
const UserSchema = new Schema({
userName: {
type: String,
required: true
},
Password: {
type: String,
required: true
}
});
module.exports = User = mongoose.model('users', UserSchema);
Front-end:
handleClick = (e) => {
const API_URL = 'http://localhost:5000/api/users/';
this.setState({
startDate: this.handleStartDate(e.target.value),
endDate: this.handleEndDate(e.target.value)
});
const newDate = {
startDate: this.state.startDate,
endDate: this.state.endDate
}
const data = JSON.stringify(newDate);
axios({
method: 'post',
url: API_URL + 'addnew',
data: data,
headers: {
'Content-Type': 'application/json; charset=utf-8',
'Access-Control-Allow-Origin': '*',
"Accept": "application/json"
}
})
.then(response => {
if (response.status === 200) {
console.log('The status code is : ' + response.status);
}
})
.catch(err => {
console.log('-------Failed to add new data. Error occurred.-------');
});
};
Backend:
// #route POST api/items
// #desc Create An Item
// #access Public
router.post('/addnew', function(req, res) {
const newItem = new Item({
entryDate: req.body.entryDate,
leaveDate: req.body.leaveDate
});
console.log(newItem);
// save model to database
newItem.save(function(err) {
if (err) {
res.json({
success: false,
message: 'failed to post data'
})
} else {
res.json({
success: true,
message: 'success to post data'
})
}
})
});
I have tested the backend API with Postman, the status code is 200, but returns the error message, shown below as in the screenshot:
Screenshot of Postman
I am not sure where I went wrong, my guess is that data of the schema 'Item' could not be saved into the collection 'items', but I have no clue what I should do.
I will be really appreciated for every little help. Thanks in advance!

Answer 1

Try to change like this
const Item = require('path/to/ItemSchemas');
// #route POST api/items
// #desc Create An Item
// #access Public
router.post('/addnew', function(req, res) {
const newItem = new Item({
entryDate: req.body.entryDate,
leaveDate: req.body.leaveDate
});
console.log(newItem);
// save model to database. Since newItem hasn't been added to the db, we used Item.save instead
Item.save(newItem, function(err) {
if (err) {
// save to db failed!
res.status(500).json({
success: false,
message: err
})
} else {
res.json({
success: true,
message: 'success to post data'
})
}
})
});