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();
});
});
Related
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);
})
})
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 have a problem. I'm trying to save answers from a survey. My problem is that I'm sending these answers through axios and they are showing in the console.log from the server, which means that my data is reaching the server safely. But data is not being saved. Also no error is shown.
Server.js
router.route('/answers')
//post answers to database
.put(function(req, res){
var survey = new Survey();
survey.name = req.body.name;
survey.email = req.body.email;
survey.q_id = req.body.q_id;
survey.q_text = req.body.q_text;
survey.answer = req.body.answer;
console.log(Survey.collection)
survey.save(function(err){
if(err){
console.log(err)
return ;
}
res.send(survey);
});
})
Survey.js (Model)
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var ObjectId = mongoose.Schema.Types.ObjectId;
var question = new Schema({
q_text:String,
order: Number,
options:[{
type: {type: String},
value: {type: String}
}]
});
module.exports = mongoose.model('Question',question);
Code that is posting the data
const url = 'http://localhost:3100/api/answers';
axios.put(url, survey)
.then(res => {
console.log('Successfully posted');
console.log(res);
setSubmitting(false);
setStatus({submitted: true});
})
.catch(err => {
console.log(err);
})
Try this :
survey.save(function(err, savedSurvey){
if(err){
console.log(err)
return ;
}
res.send(savedSurvey);
});
hi i am trying to remove a value from mongoDB but instead of removing a specific value the code is deleting all users from the schema lol.
var mongoose = require('mongoose');
var User = require('../../models/UserModel');
module.exports.unfollow = function(req, res){
var thefollowee = req.body.followee;
var thefollower = req.body.follower;
User.find({_id: thefollower}).remove({following: thefollowee}).exec();
User.find({_id: thefollowee}).remove({followers: thefollower}).exec();
res.json({ message: 'Unfollowed'});
};
the followee is pointing to the id of the person being followed,
the follower is pointing to the id of the user who follows the followee.
ok so i got it by using the $pull method
var mongoose = require('mongoose');
var User = require('../../models/UserModel');
module.exports.unfollow = function(req, res){
var thefollowee = req.body.followee;
var thefollower = req.body.follower;
User.findByIdAndUpdate(thefollowee, { $pull: { followers: req.body.follower }}, function (err, user) {
if (err)
return handleError(err);
});
User.findByIdAndUpdate(thefollower, { $pull: { following: req.body.followee }}, function (err, user) {
if (err)
return handleError(err);
});
res.json({ message: 'Unfollowed'});
};
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);
});
});