I'm currently trying to remove multiple documents references (objectId) when i'm removing those documents.
So this is my code to remove multiple documents and their references:
Comment.find({parentCommentId: req.params.id}).stream()
.on('data', function (comment) {
comment.remove(function (err, result) {
if (err){
console.log(err)
}
console.log(result);
})
})
.on('error', function(err){
// handle error
})
.on('end', function(){
res.status(200).json({
title: 'Comments deleted'
});
});
(this is the middleware i use)
schema.post('remove', function (comment) {
Project.findById(comment.project, function (err, project) {
if(err){
console.log('error : '+ err)
}
project.comments.pull(comment);
project.save();
});
User.findById(comment.user, function (err, user) {
if(err){
console.log('error : '+ err)
}
user.comments.pull(comment);
user.save();
});
});
At the moment i tried multiple things but i kinda got stuck: it removes all the documents i wanted but it always only removes the first document's reference and keeps the other ones.
at this point i don't really understand why.
Have a good day : )
Related
I am having issues storing a value in mongodb to a variable to use within my webpage.
When the user fills out a form on my website, I am trying to figure out what the arrivalTrailer was when the user filled out the arrival form.
So far I have
function previousLoad(loadNumber, callback){
CheckCall.find({loadNumber: loadNumber}).sort({date: 'desc'}).limit(1), function(err, arrival){
if (err){
callback(err, null);
}
else {
callback(null, arrival[0]);
}
}};
previousLoad(loadNumber, function(err, arrival){
if (err){
console.log(err);
}
else{
arrivalTrailer = arrival;
console.log(arrival);
}
});
console.log(previousLoad.arrival);
console.log(arrivalTrailer);
Both output as undefined when I try to console.log the variables.
Thank you :D
Try this :
async function previousLoad(loadNumber) {
try {
let resp = await CheckCall.find({ loadNumber: loadNumber }).sort({ date: -1 }).limit(1)
return resp[0]
} catch (error) {
console.log('error ::', error)
throw new Error (error)
}
}
/** You can return response from previousLoad but to test it, Call it from here */
previousLoad(loadNumber).then(resp => { console.log('successfully found ::', resp)}).catch(err => { console.log('Error in DB Op ::', err)});
I am using node-v8.9.1-x64. & postgresql-10.1-2. I have tried running this code but its gives an error "code deprecated" and even tried some other ways. It still comes back with new errors
app.get('/', function(req, res) {
// PG connect -code deprecated
pg.connect(connect, function(err, client, done) {
if(err) {
return console.error('error fetching client from pool', err);
}
client.query('SELECT * FROM books', function(err, result) {
if(err) {
return console.error('error running query', err);
}
res.render('index', {books: result.rows});
done();
});
});
I went through the documentation but I am not getting it. Please somebody help me.
I'm trying to get a list of all "Task" documents from my mongoDB in a reverse order, so latest added "Tasks" are first in the list.
Is there a smart way of doing that?
allTasks(){
return Task.find(function (err, allTasks) {
if (err) return console.error(err);
return allTasks;
})
}
UPDATE
Following code solves the problem:
allTasks(){
return Task.find().sort({created_at:-1}).exec(function (err, allTasks) {
if (err) return console.error(err);
con
return allTasks;})
}
I am using Sails and Waterline ORM with Mongo Database .
I have two models User and Profile with One to One relationship.
Below is the code I've written for Transaction with Rollback logic. I think there can be a much better logic than this as the current logic is very clumsy.
Questions :
Does Waterline or Sails provide any functionality for Rollback purpose?
Is there any better way of doing this ?
User.create(newUser).then(function (data) {
var newProfile = {
displayName: data.name,
email: data.email,
user: data._id
}
return Profile.create(newProfile);
}).then(function (profileData) {
sails.log.info("Profile Data " + JSON.stringify(profileData));
// Update the user with Profile Info
User.update(newUser._id, {profile: profileData._id}).then(function (updatedUser) {
return updatedUser;
}, function (err) {
// TODO Rollback logic if the User Updation Fails
})
}, function (err) {
sails.log.error("Failed to Create Profile for the User . Deleting the created User");
var criteria = {
email: data.email
}
User.destroy(criteria).then(function (user) {
sails.log.error("Deleted the Created User " + JSON.stringify(user));
throw new Error("ERROR CREATING User");
}, function (err) {
sails.log.error("ERROR DELETING USER");
throw new Error("ERROR DELETING USER", err);
})
});
To question 1 : no.
I would be tempted to do something like this:
async.waterfall([
function(callback){
User.create(newUser).then(function(data){
callback(null, data);
})
.catch(function(err){
callback(err, null, null); // don't need to rollback anything
})
},
function(data, callback){
Profile.create({
displayName: data.name,
email: data.email,
user: data._id
})
.then(function(profile){
callback(null, data, profile)
})
.create(function(err){
callback(err, data._id, null); // only need user's id
})
},
function(userData, profileData, callback){
User.update(userData._id, {profile: profileData._id})
.then(function(updatedUser){
callback(null, updatedUser);
})
.catch(function(err){
callback(err, userData._id, profileData._id); // can roll back both
})
}
], function(err, userData, profileData){
if(err) {
sails.log.error(err);
// do rollback, userData is user's ID, profileData is profile id
// if either one is undefined, then it doesn't exist
} else {
// userData is user object from the last update, return it!
}
})
I don't know if it is better, but it seems more readable, and it handles the errors for any of the three writing phases.
I'm trying to:
Pass user's ID to a model query, that should return the user record from mongo.
Render this user object to my view so I can use its fields.
I'm not quite sure what's going wrong - the query function finds the correct user and I can console.dir to see all the fields. When I try to return it to my view with res.render I get nothing:
Here's my route:
app.get('/account', function(req, res) {
res.render('account', {title: 'Your Account', username: req.user.name, user:account.check(req.user.id) });
});
And my query function:
exports.check = function(userId) {
MongoClient.connect('mongodb://127.0.0.1:27017/test', function(err, db) {
if(err) throw err;
var collection = db.collection('test');
collection.findOne({userId : userId}, function(err, user) {
if (err) throw err;
console.log("account.check logging found user to console: ");
console.dir(user);
return user;
});
});
}
Again, this shows the proper entry
Finally my view:
<h1>Account Page</h1>
<hr>
<p>Why, Hello, there <b> {{username}} </b> </p><br/>
<p>You came from {{user.provider}}</p>
<p>{{user.lastConnected}}</p>
Go Home ~ Log Out
Any held would be most appreciated!
The MongoDB findOne function is asynchronous (it takes a callback as an argument). This means that your check function also needs to be asynchronous and take a callback as an argument (or return a promise).
Then you should call res.render() inside the callback you pass to query on success.
app.get('/account', function(req, res) {
account.check(req.user.id, function(error, user) {
if (error) {
// do something smart like res.status(500).end()
return;
}
res.render('account', {title: 'Your Account', username: req.user.name, user:user });
}
});
And the check function should be something like:
exports.check = function(userId, callback) {
MongoClient.connect('mongodb://127.0.0.1:27017/test', function(err, db) {
if(err) {
callback(err);
}
var collection = db.collection('test');
collection.findOne({userId : userId}, function(err, user) {
if(err) {
callback(err);
}
console.log("account.check logging found user to console: ");
console.dir(user);
callback(null, user);
});
});
}
Of course if you don't need to do any additional processing, you can just pass your the callback argument as the callback to collection.findOne(). I just kept it this way because it was closer to what you were doing initially.