How can I execute this populate so that I can get the username of the person that does the tweet? I've tried with the function getusername() but it is not working as it gives me a tweetsSchema.findOne is not a function error.
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var tweetsSchema = new Schema(
{
tweets: { type: String, required: true }, //reference to the associated book
replies: { type: String, required: false },
username: { type: Schema.Types.ObjectId, ref: 'users' }
}
);
// Virtual for bookinstance's URL
function getUsername(tweets){
return tweetsSchema.findOne({ tweets: tweets })
.populate('username').exec((err, posts) => {
console.log("Populated User " + username);
})
}
getUsername()
//Export model
module.exports = mongoose.model('tweets', tweetsSchema);
currently the function you have defined is just a function and haven't defined on the Schema of yours and not exported.
you might want to use static in mongoose
tweetsSchema.static('getUsername', async function(tweets){
return await tweetsSchema.findOne({ tweets: tweets })
.populate('username').exec((err, posts) => {
console.log("Populated User " + username);
})
})
Related
I created some sample code to demonstrate my issue on a smaller scale. From my understanding, a getter function will not affect anything on my database, but when I want to make a get request to view items on my database, it will change the value to whatever is returned only when the data is displayed. However, when I make my get request to view items on my database, the item I am shown is exactly how it was saved. I'm not sure if I'm misunderstanding what a getter function is, or if my syntax is just incorrect somewhere.
Here is my main server:
const express = require('express')
const mongoose = require('mongoose')
// Linking my model
const User = require('./User')
// Initializing express
const app = express()
const PORT = 9999
app.use(express.json())
// Connecting to mongodb
const connectDB = async () => {
try {
await mongoose.connect('mongodb://localhost/testdatabase', {
useUnifiedTopology: true,
useNewUrlParser: true
})
console.log('Connected')
} catch (error) {
console.log('Failed to connect')
}
}
connectDB()
// Creates a new user
app.post('/user/create', async (req, res) => {
await User.create({
name: 'John Cena',
password: 'somepassword'
})
return res.json('User created')
})
// Allows me to view all my users
app.get('/user/view', async (req, res) => {
const findUser = await User.find()
return res.json(findUser)
})
// Running my server
app.listen(PORT, () => {
console.log(`Listening on localhost:${PORT}...`)
})
Here is my model:
const mongoose = require('mongoose')
// My setter - initialPassword is 'somepassword'
// This seems to work properly, in my database the password is changed to 'everyone has the same password here'
const autoChangePassword = (initialPassword) => {
console.log(initialPassword)
return 'everyone has the same password here'
}
// My getter - changedPassword should be 'everyone has the same password here' I think
// The console.log doesn't even run
const passwordReveal = (changedPassword) => {
console.log(changedPassword)
return 'fakehash1234'
}
// Creating my model
const UserSchema = mongoose.Schema({
name: {
type: String
},
password: {
type: String,
set: autoChangePassword,
get: passwordReveal
}
})
// Exporting my model
const model = mongoose.model('user', UserSchema)
module.exports = model
Not sure if it would help anyone since I found my answer on another StackOverflow post, but the issue was I had to set getters to true when converting back to JSON:
// Creating my model
const UserSchema = mongoose.Schema({
name: {
type: String
},
password: {
type: String,
set: autoChangePassword,
get: passwordReveal
}
}, {
toJSON: { getters: true }
})
Any similar problems can be solved by adding some combination of the following:
{
toJSON: {
getters: true,
setters: true
},
toObject: {
getters: true,
setters: true
}
}
I am trying to fetch all users from a MongoDB database. However for some reason recently the request did not fetch anything.
Here is the code in which I try to fetch the data:
app.get('/api/allusers', (req, res) => {
Employee.find()
.then(rettrievedData => {
res.json(rettrievedData)
});
});
Here is the mongoose model:
const mongoose = require('mongoose');
const employeeSchema = mongoose.Schema({
name: { type: String },
surName: { type: String },
mail: { type: String },
phone: { type: String },
});
module.exports = mongoose.model('Employee', employeeSchema, 'employee.employees');
Here is the code for connecting to Mongo
mongoose.connect("mongodb+srv://Kiril:xxxxxxxxxxxxx#cluster0-owdfy.mongodb.net/employee?retryWrites=true&w=majority")
.then(() => {
console.log("Connected")
})
Also I have checked that there is data in the database, but for some reason the Employee.find() does not retrieve anything. What can be reason?
Thanks in advance.
why you are adding 'employee.employyes' when you creating your model
try to export the model without it
module.exports = mongoose.model('Employee', employeeSchema)
or better
exports.Employee = mongoose.model('Employee', employeeSchema)
and require it where you want to use it
const Employee = require('path to the schema file')
I'm not 100% sure about how to formulate this question.
Consider the following code of the 'message.js' model file.
I have a "post remove" hook in which I query the User collection, which is defined in the user.js file (That file is pretty much the same as this one).
Now, what I'd like to do is to query the Message collection(which is defined in this file) inside the "pre save" hook.
Is it possible to do that ?
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var User = require('./user');
var schema = new Schema({
content: {type: String, required: true},
user: {type: Schema.Types.ObjectId, ref: 'User'}
});
schema.post('remove', function (message) {
User.findById(message.user, function (err, user) {
user.messages.pull(message);
user.save();
});
});
schema.pre('save', function(next) {
//Here I want to query the Message collection
next();
});
module.exports = mongoose.model('Message', schema);
schema.pre('save', function(next) {
let MessageModel = mongoose.model('Message');
MessageModel.find(findQuery, (err, results) => {
if(err) handleError();
//Do stuff with results
next();
});
});
I've schema like this and i', trying to get the document from the array using _id. This is my first Mongo project that I'm working, please help me how can I achieve the. I basically want to retrieve the sub document corresponds to the id and update some data in that.
var PhoneSchema = new mongoose.Schema({
type: String,
number: String
});
var StudentSchema = new mongoose.Schema({
name: String,
dept: String,
phone: [PhoneSchema]
});
var Phone = mongoose.model('Phone',PhoneSchema);
var Student = mongoose.model('Student',StudentSchema);
I've tried the following ways, but none of them are working.
Method 1: When I tried the same in the console it is giving me the parent document along with the sub document that corresponds to the phoneId
Student.findOne({"phone._id":new mongoose.Schema.Types.ObjectId(phoneId) }, {'phone.$':1}, function(err, student) {
}
Method 2: As per the mongoose documentation to retrieve sub documents, in this case I'm getting exception saying phone is undefined
Student.phone.Id(phoneId);
I've fixed this by removing Schema from the below query
Student.findOne({"phone._id":new mongoose.Types.ObjectId(phoneId) }, {'phone.$':1}, function(err, student) {
}
i tried to solve your requirement. The following code did the job.
var PhoneSchema = new mongoose.Schema({
type: String,
number: String
});
var StudentSchema = new mongoose.Schema({
name: String,
dept: String,
phone: [PhoneSchema]
});
var Phone = mongoose.model('Phone',PhoneSchema);
var Student = mongoose.model('Student',StudentSchema);
var newPhone = new Phone({
type: 'ios', number: '9030204942'
});
var newStudent = new Student({
name:'Pankaj',
dept:'cse',
phone:newPhone
});
// newStudent.save(function(err, ph) {
// if (err) return console.error(err);
// });
Student.findOne({"phone._id":mongoose.Types.ObjectId('587e6409e06170ba1708dc21') },{_id:0,phone:1}, function(err, phone) {
if(err){
console.log(err)
}
console.log(phone);
});
Find the following screenshot with result
I would like to add a category and then if successed, push it's ref to user' collection. That's how I'm doing this:
That's mine "dashboard.js" file which contains categories schema.
var users = require('./users');
var category = mongoose.model('categories', new mongoose.Schema({
_id: String,
name: String,
ownerId: { type: String, ref: 'users' }
}));
router.post('/settings/addCategory', function(req, res, next) {
console.log(req.body);
var category_toAdd = new category();
category_toAdd._id = mongoose.Types.ObjectId();
category_toAdd.name = req.body.categoryName;
category_toAdd.ownerId = req.body.ownerId;
category.findOne({
name: req.body.categoryName,
ownerId: req.body.ownerId
}, function(error, result) {
if(error) console.log(error);
else {
if(result === null) {
category_toAdd.save(function(error) {
if(error) console.log(error);
else {
console.log("Added category: " + category_toAdd);
<<<<<<<<<<<<<<<<<<<THE CONSOLE LOG WORKS GOOD
users.categories.push(category_toAdd);
}
});
}
}
});
Here is my "users.js" file which contains "users" schema.
var categories = require('./dashboard');
var user = mongoose.model('users', new mongoose.Schema({
_id: String,
login: String,
password: String,
email: String,
categories: [{ type: String, ref: 'categories' }]
}));
So, the category add proccess works well and I can find the category in database. The problem is when I'm trying to push the category to user.
This line:
users.categories.push(category_toAdd);
I get this error:
Cannot read property "push" of undefined.
I need to admit once more that before that pushing there is console.log where the category is printed properly.
Thanks for your time.
The users object is a Mongoose model and not an instance of it. You need the correct instance of the users model to add the category to.
dashboard.js
...
category_toAdd = {
_id: mongoose.Types.ObjectId(),
name: req.body.categoryName,
ownerId: req.body.ownerId
};
// Create the category here. `category` is the saved category.
category.create(category_toAdd, function (err, category) {
if (err) console.log(err);
// Find the `user` that owns the category.
users.findOne(category.ownerId, function (err, user) {
if (err) console.log(err);
// Add the category to the user's `categories` array.
user.categories.push(category);
});
});