I can't make a query to all profiles that are included in a specific department.
I'm using nodejs with mongo and mongoose. An example of a Profile schema is the next:
Profile: {
"level": 1,
"departments": [
{
"_id": "5c5f3bb4338fde6c60a684d4",
"department": "5c106a324acd0571241323f2",
"name": "Calidad"
},
{
"_id": "5c5f3794eca3f14cd49e395e",
"department": "5c106bad99142733446a44f0",
"name": "Mantenimiento"
}
]
This below is the query I tried:
Profile.find({ departments: [{ department: req.params.id }] })
.then(profiles => res.json(profiles))
.catch(err =>
res.status(404).json({ nodepartmentfound: "No departments found" })
);
I expect to return tan array with all profiles with the specified department.
Try the following code:
Profile.find({ "departments.department": req.params.id })
.then(profiles => res.json(profiles))
.catch(err =>
res.status(404).json({ nodepartmentfound: "No departments found" })
);
Basically, what you want to do is query an array of embedded documents. Using the dot notation is enough to solve your problem. Relevant documentation can be found here.
Related
I'm trying to get all documents from my database collection "posts" but I'm getting an empty array instead.
The strange thing is that I'm able to get all documents from another collection called "users" that has the same structure and using the exact same code.
I've spent days looking for an answer but I haven't been able to find the solution.
This is the request:
const db = admin.firestore();
exports.getAllPosts = (req, res) => {
db.collection('posts')
.orderBy('createdAt', 'desc')
.get()
.then(snapshot => {
let posts = [];
snapshot.forEach((doc) => {
posts.push({
id: doc.id,
body: doc.data().body,
author: doc.data().author,
createdAt: doc.data().timestamp,
voteScore: doc.data().voteScore
});
});
return res.json(posts);
})
.catch(err => {
console.error(err);
res.status(500).json({ error: err.code });
});
}
And this is the response:
[]
This is what my current collection looks like:
Posts collection screenshot
This the response that I get when I return "snapshot":
{
"_query": {
"_firestore": {
"_settings": {
"projectId": "readable-bf7a6",
"firebaseVersion": "9.6.0",
"libName": "gccl",
"libVersion": "4.10.0 fire/9.6.0"
},
"_settingsFrozen": true,
"_serializer": {
"allowUndefined": false
},
"_projectId": "readable-bf7a6",
"registeredListenersCount": 0,
"bulkWritersCount": 0,
"_backoffSettings": {
"initialDelayMs": 100,
"maxDelayMs": 60000,
"backoffFactor": 1.3
},
"_clientPool": {
"concurrentOperationLimit": 100,
"maxIdleClients": 1,
"activeClients": {},
"failedClients": {},
"terminated": false,
"terminateDeferred": {
"promise": {}
}
}
},
"_queryOptions": {
"parentPath": {
"segments": []
},
"collectionId": "posts",
"converter": {},
"allDescendants": false,
"fieldFilters": [],
"fieldOrders": [
{
"field": {
"segments": [
"createdAt"
]
},
"direction": "DESCENDING"
}
],
"kindless": false
},
"_serializer": {
"allowUndefined": false
},
"_allowUndefined": false
},
"_readTime": {
"_seconds": 1622395245,
"_nanoseconds": 513743000
},
"_size": 0,
"_materializedDocs": null,
"_materializedChanges": null
}
Notice how the request for the collection "users" works successfully:
const db = admin.firestore();
exports.getAllUsers = (req, res) => {
db.collection('users')
.orderBy('createdAt', 'desc')
.get()
.then(snapshot => {
let users = [];
snapshot.forEach((doc) => {
let users = [];
snapshot.forEach((doc) => {
users.push({
id: doc.data().userId,
email: doc.data().email,
handle: doc.data().handle
});
});
return res.json(users);
})
.catch(err => {
console.error(err);
res.status(500).json({ error: err.code });
});
}
And the response:
[
{
"id": "EPoHBxhQFUXbcL3TCVx1LdUG2nO2",
"email": "ruben#gmail.com"
},
{
"id": "RqEa3dEq8TSDcZYeolXafju67rB2",
"email": "user10#gmail.com"
},
{
"id": "dxveb4n2iMQej5Q14uprsKRxFp23",
"email": "user4#gmail.com",
"handle": "user4"
},
{
"id": "YQPzBPcsqlVZk9iJEuZTHKUNuVG2",
"email": "user2#gmail.com",
"handle": "user2"
},
{
"id": "CZ05BJxi3TUOpIrmBaz539OWlbC3",
"email": "user#gmail.com",
"handle": "user"
},
{
"id": "t0t83BVwt4gVgJkDv7HL1r1MaKr1",
"email": "userJose2#gmail.com",
"handle": "Jose"
}
]
This is what the users collection looks like in Firebase:
Users collection screenshot
Why is one collection failing when the other works fine and I'm using the same code? What am I missing here?
Thanks in advance and I hope I've made it as clear as possible. Please let me know if you need me to provide anything else.
Very simple my friend, your posts documents can't be ordered like this:
.orderBy('createdAt', 'desc')
Because the post documents does not have the createdAt property, but they have a timestamp property, you should use that property to order your posts like this:
.orderBy('timestamp', 'desc')
I hope that helps 👍
I am not answering directly to #Ruben Garcia Bri, but for future firebase developers who may run into the problem of getting empty documents, I also ran into the same problem, but I solved it by adding a field to the particular document I am trying to retrieve.
Sometimes the cause is because the documents you are trying to get have no field in them.
I mean that a document must have a field before the server can recognize it as an existing document.
So if you run into this problem, consider adding a field to that document before you can successfully retrieve it.
I have tried to make the relationship between two models in node js express app. I used the world ref to retrieve the user's names who created the courses however, when I create the course from the user after login or register, it does not show anything about the user who created that course. Instead, it shows an empty [] array. I want to show the user full name who created that course.
User's ref in the course model:
},
creator: [
{
ref: "Users",
type: mongoose.Schema.Types.ObjectId,
},
],
Here I am trying to get the user who created the course:
//Get all courses
exports.getAllCourses = async (req, res) => {
await Courses.find()
.sort("-created")
.populate("creator", "firstName lastName fullName")
.exec((err, courses) => {
if (err) {
res.status(500).send({ message: error.message });
} else {
res.status(200).send({
message: "All courses fetched successfully",
result: courses,
});
}
});
};
The result I am getting in postman:
{
"message": " All courses fetched successfully",
"result": [
{
"creator": [], <----- Here I am getting the user as an empty array
"_id": "606d0f4d6051bb308089b5d2",
"courseCode": "Math202",
"courseName": "Math linear algebra",
"section": "001",
"semester": 1,
"__v": 0
}
.populate({ path: 'creator', model: 'Users', select: 'firstName lastName fullName' });
I have tried to get the Instagram media comments using API. I am getting empty array when I use API .I have tried sandbox live and also I make my profile public but still I get the comment data empty.
instagram.get('/media/2128588978223438874_685479/comments').then(data=> {
console.log(data); })
.catch(err => {
console.log(err);
})
I expected the output was : {
"data": [
{
"created_time": "1280780324",
"text": "Really amazing photo!",
"from": {
"username": "snoopdogg",
"profile_picture": "http://images.instagram.com/profiles/profile_16_75sq_1305612434.jpg",
"id": "1574083",
"full_name": "Snoop Dogg"
},
"id": "420"
},
...
] } .
but actual output I get was
{ data: [], meta: { code: 200 } }
media-id is just a placeholder for the real Id. Replace it and it will work.
Here is a request for getting media information, together with it's id.
instagram.get('/media/' + media_id + '/comments')
.then(data => {
console.log(data);
})
.catch(err => {
console.log(err);
})
I'm trying to find record using $in in mongoose. But it's not working for me. I have same query in mongo shell its working but in mongoose it is not workinh
my schema
{
"_id": "574f1f979f44e7531786c80f",
"name": "mySchool2",
"branch": "karachi",
"location": "Clifton ",
"block": false,
"created_at": 1464803223441,
"updated_at": 1464803223441,
"__v": 0,
"classes": [
"574f216afd487958cd69772a"
],
"admin": [
"574f20509f44e7531786c811",
"57508a2a3a0a919c16ace3c0"
],
"teacher": [
"574f20f39f44e7531786c812",
"575002b48188a3f821c2a66e",
"57500bbaea09bc400d047bf6"
],
"student": [
"574f2d56590529c01a2a473b",
"574f2e5842c5885b1b1729ab",
"574f2ed542c5885b1b1729ae",
"574f2f57555210991bf66e07",
"574f2fcd087809b11bd8d5e4",
"574f301d1f5025d61b7392b6",
"574f30481d02afff1bb00c71",
"574f30b01d02afff1bb00c74",
"574f310038136b3d1cf31b96"
]
}
My mongose query
app.services._chkAdminSchool = function(payload){
var deferred = q.defer();
School
//.find({ teacher:{$in:['574f20f39f44e7531786c812']}})
.find({_id : "574f1f979f44e7531786c80f",admin:{"$in":[Object("57508a2a3a0a919c16ace3c0")]}})
//.select(filers)
.exec(function(error, record) {
if (error) {
deferred.reject({
status:404,
message: 'Error in API',
error: error
});
} else {
if(record.length === 0){
deferred.reject({
message: 'Admin and school doesnot match',
data: record
});
}else{
deferred.resolve({
message: 'Successfully get Admin',
data: record
});
}
}
});
return deferred.promise;
}
records are return empty array.
Thanks in advance for help
The query you use works fine for me and returns object, make sure you define admin field in Schema like this:
"admin": [{type: mongoose.Schema.ObjectId }]
to avoid admin array object being string. If you compare Object("57508a2a3a0a919c16ace3c0") to "57508a2a3a0a919c16ace3c0" it will return empty array, check and replay to me, thanks.
I am not sure about how you define your School Schema, but if you are saving id in admin array as String, you don't need to change to Object in your mongoose query.
School.find({
_id: "574f1f979f44e7531786c80f",
admin: {
$in : ['57508a2a3a0a919c16ace3c0']
}
}, functin (err, record) {
...
})
I am building a Node.js express RESTfull API using Mongodb and mongoose.
This is my schema:
var UserSchema = new mongo.Schema({
username: { type: String },
password: { type: String, min: 8 },
display_name: { type: String, min: 1 },
friends: { type: [String] }
});
UserSchema.post('remove', function(next){
console.log({ friends: this._id }); // to test if this gets reached (it does)
UserSchema.remove({ friends: this._id });
});
And this is the function that removes a User:
.delete(function(req, res) {
User.findById(req.params.user_id, function(err, user) {
if (err) {
res.status(500);
res.send(err);
} else {
if (user != null) {
user.remove();
res.json({ message: 'User successfully deleted' });
} else {
res.status(403);
res.json({ message: 'Could not find user.' });
res.send();
}
}
});
});
What I need to do is when a user is removed, his or her _id (String) should also be removed from all the other users' friends array. Hence the remove hook in the schema.
Right now the user gets deleted and the hook gets triggered, but the user _id is not removed from the friends array (tested with Postman):
[
{
"_id": "563155447e982194d02a4890",
"username": "admin",
"__v": 25,
"password": "adminpass",
"display_name": "admin",
"friends": [
"5633d1c02a8cd82f5c7c55d4"
]
},
{
"_id": "5633d1c02a8cd82f5c7c55d4",
"display_name": "Johnybruh",
"password": "donttouchjohnsstuff",
"username": "John stuff n things",
"__v": 0,
"friends": []
}
]
To this:
[
{
"_id": "563155447e982194d02a4890",
"username": "admin",
"__v": 25,
"password": "adminpass",
"display_name": "admin",
"friends": [
"5633d1c02a8cd82f5c7c55d4"
]
}
]
To try and figure it out I have looked at the Mongoosejs Documentation, but the mongoose doc example doesn't cover the remove hook. Also this stackoverflow qestion but this question seems to be about removing from other schemas.
I think i'm doing the remove in the hook wrong, but I can't seem to find the problem.
Thanks in advance!
EDIT:
I could not get the first suggestion by cmlndz to work, so I ended up fetching all the documents with arrays that contained the to-be-deleted users' id and pulling it from them one-by-one:
The delete function now contains this bit of code that does the magic:
// retrieve all documents that have this users' id in their friends lists
User.find({ friends: user._id }, function(err, friends) {
if (err) {
res.json({ warning: 'References not removed' });
} else {
// pull each reference to the deleted user one-by-one
friends.forEach(function(friend){
friend.friends.pull(user._id);
friend.save(function(err) {
if (err) {
res.json({ warning: 'Not all references removed' });
}
});
});
}
});
You could use $pull to find all documents that contain the "ID" in the "friends" array -or- find any matching document and popping the "ID" out of the array one by one.