Develop Reference

MongoDB Get Field to Update a Value from Request Query

I have user object structured like this:
{
"id": "",
"username": "",
"name": "",
"bio": "",
"email": "",
"profileImg": "",
"phoneNumber": 0,
"messagingPoints": 0,
"funds": 0,
"inventoryId": "",
"lastLogin": "2022-02-23T03:27:13.535Z",
"isPrivate": false,
"messagesReceived": []
}
I want to be able to reach a patch endpoint to update any of these fields. For example, /api/user?id=userId&name=John, should be able to grab the field "name" and set it to John. /api/user/id=?id=userId&email=abc#gmail.com should grab the email field and set it to abc#gmail.com
I am struggling to find docs for MongoDB to accomplish this, so I'm wondering if it is not possible? Do I need a specific endpoint for each of these update operations (ex: /api/user/name?id=userId&value=John instead of /api/user?id=userId&name=John)?
If it is possible, how could I accomplish this? Thanks!

You can pass user ID in update filter. Also you can pass data in request body of the PUT request instead of query parameters.
app.put('/api/user', async (req, res) => {
const { id, ...data } = req.body;
// Filter out any invalid fields
// Update documents where id field is equal to value of id in request body
await collection.updateOne(
{ id },
{ $set: data }
);
return res.json({ data: "User updated" })
})

Getting username from GuildMember

When I was coding a guildMemberAdd and a guildMemberRemove I ran across an issue... So, I was wondering, how do you obtain the user's username and discriminator from when they join? as when I tried member.username and member.discriminator it logs as undefined and undefined
Code below, nothing was printed to console upon this issue:
exports.run = (client, member) => {
member.guild.channels.find(`name`, `mod-logs`).send({embed: {
"color": 8311585,
"footer": {
"text": "Bot made by: Pawxeric#0858"
},
"author": {
"name": "New Member",
"icon_url": member.avatarURL
},
"fields": [
{"name": `${member.username}#${member.discriminator}`, // logs as undefined#undefined
"value": "Joined"}
]
}});
}
Also, the code is having issues picking up anything that uses the member value. Like avatarURL, username, and discriminator. If there's something I'm missing, please share down below :3c

I think you want to get properties from a user object
<member>.user
User has username, discriminator and avatarurl.
The full object can be found on https://discord.js.org/

Optimalization of firebase query. Getting data by ids

I'm new in Firebase. I would like to create an app (using Angular and AngularFire library), which shows current price of some wares. I have list all available wares in Firebase Realtime Database in the following format:
"warehouse": {
"wares": {
"id1": {
"id": "id1",
"name": "name1",
"price": "0.99"
},
"id2": {
"id": "id2",
"name": "name2",
"price": "15.00"
},
... //much more stuff
}
}
I'm using ngrx with my app, so I think that I can load all wares to store as an object not list because normalizing state tree. I wanted load wares to store in this way:
this.db.object('warehouse/wares').valueChanges();
The problem is wares' price will be refresh every 5 minutes. The number og wares is huge (about 3000 items) so one response will be weight about 700kB. I know that I will exceed limit downloaded data in a short time, in this way.
I want limit the loading data to interesing for user, so every user will can choose wares. I will store this choices in following way:
"users": {
"user1": {
"id": "user1",
"wares": {
"id1": {
"order": 1
},
"id27": {
"order": 2
},
"id533": {
"order": 3
}
},
"waresIds": ["id1", "id27", "id533"]
}
}
And my question is:
Is there a way to getting wares based on waresIds' current user? I mean, does it exist way to get only wares, whose ids are in argument array? F.e.
"wares": {
"id1": {
"id": "id1",
"name": "name1",
"price": "0.99"
},
"id27": {
"id": "id27",
"name": "name27",
"price": "0.19"
},
"id533": {
"id": "id533",
"name": "name533",
"price": "1.19"
}
}
for query like:
this.db.object('warehouse/wares').contains(["id1", "id27", "id533"]).valueChanges();
I saw query limits in Angular Fire like equalTo and etc. but every is for list. I'm totally confused. Is there anyone who can help me? Maybe I'm making mistakes in the design of the app structure. If so, I am asking for clarification.

Because you are saving the ids inside user try this way.
wares: Observable<any[]>;
//inside ngOnInit or function
this.wares = this.db.list('users/currentUserId/wares').snapshotChanges().map(changes => {
return changes.map(c => {
const id = c.payload.key; //gets ids under users/wares/ids..
let wares=[];
//now get the wares
this.db.list('warehouse/wares', ref => ref.orderByChild('id').equalTo(id)).valueChanges().subscribe(res=>{
res.forEach(data=>{
wares.push(data);
})
});
return wares;
});
});

There are two things you can do. I don't believe Firebase allows you to query for multiple equals values at once. You can however loop over the array of "ids" and query for each one directly.
I am assuming you already queried for "waresIds" and you've stored those ID's in an array named idArray:
for id in idArray {
database.ref('warehouse/wares').orderByChild('id').equalTo(id).once('value').then((snapshot) => {
console.log(snapshot.val());
})
}
In order to use the above query efficiently you'll have to index your data on id.
Your second option would be to use .childChanged to get only the updated data after your initial fetch. This should cut down drastically on the amount of data you need to download.

Yes , you can get exactly data that you want in firebase,
See official Firebase documents about filtering
You need to get each waresID
var waresID = // logic to get waresID
var userId = // logic to get userId
var ref = firebase.database().ref("wares/" + userId).child(waresID);
ref.once("value")
.then(function(snapshot) {
console.log(snapshot.val());
});
this will return only data related to that waresID or userId
Note: this is javascript code, i hope this will work for you.

Filter out unwanted data from Response

I am working on a service which uses restify and mongoose as odm.
Below is the service response which I get after DB call.
[
{
"_id": "5a548b7c025cfcffdd286e0f",
"createdAt": "2018-01-09T09:29:32.515Z",
"updatedAt": "2018-01-09T10:59:49.159Z",
"subject": "Hello buddy.",
"body": "i am good and fine.",
"category": "email service",
"category_id": "232",
"author": "5a5485834c2274ce5d5e54f8",
"__v": 0,
"images": [
"https://google.com"
],
"email content": [
{
"_id": "5a549dcb80a16b2e822357ae",
"createdAt": "2018-01-09T10:47:39.883Z",
"updatedAt": "2018-01-09T10:47:39.883Z",
"body": "my first comment",
"name": "asdf"
"password":"312312"
"__v": 0,
"photos": []
}
]
}]
Emails.find({_id: emaiId, author_id: author_id}).
populate('emailcontent').exec(function(err, listOfEmails) {
if (err) {
console.error(err);
return next(
new errors.InvalidContentError(err.errors.name.message),
);
}
res.send(listOfEmails);
next();
This is a small part of my response. Now, I do not want to send all the response back to the client. For example, username, password, phone no etc. So I have a lot of data which I do not want to send back. How do I do this in over here?

Delete these fields manually before sending data back:
listOfEmails.forEach(email => {
// for array properties
email['email content'].forEach(content => {
delete content.name;
delete content.password;
// ... and so on
});
// for usual properties
delete email._id;
});
res.send(listOfEmails);

Answers above are about black listing fields, but you can also try whitelisting, e.g.
const croppedEmails = emails.map( (email) => {
body: email.body,
...(rest of needed fields)
});
With this approach when you will add new field which is confidential you will not have to add new delete, on the other hand when adding new public field you will also need to add it to above function.
Oh, and there is also projection Mongoose, find, return specific properties

You can use map() to create a new array that you send as response. Use delete to delete fields.
const newListOfEmails = listOfEmails.map((email) => {
delete email._id;
delete email.createdAt;
delete email.updatedAt;
for (let eIdx = 0; eIdx < email["email content"].length; eIdx += 1) {
delete email["email content"][eIdx].password;
}
return email;
});
res.send(newListOfEmails);

Error getting a single value from a collection

I have a collection called notification and i am trying to get a single value with findOne()
var allnotices = Notifications.findOne({eventownernumber:"2"},{sort: {noticedate: -1, limit: 1}}).noticemessage;
I want to get the value where the eventownernumber is 2 and i want to get the latest record and i only want one record.
Even though noticemessage is part of the row fields,i get the error that noticemessage is undefined.
This is the schema
{
"_id": "tmkWCydSKZtYdrKTZ",
"eventoriginalid": "3bXvARk6K6yhee6Hi",
"lat": "-1.851881824302658",
"lng": "96.987469482421875",
"eventownernumber": "1",
"eventownernames": "Test 1",
"eventtitle": "ci",
"eventtime": "08:05",
"invited": "0",
"eventduration": "21",
"eventtype": "notification",
"eventcategory": "hackathon",
"eventstatus": "11",
"createdAt": {
"$date": "2016-11-02T12:38:40.378Z"
},
"noticedate": {
"$date": "2016-11-02T16:50:53.394Z"
},
"noticenumber": "2",
"noticenames": "Test 2",
"noticemessage": "Test 2 has joined your event ci",
"noticestatus": "12"
}
Why is noticemessage undefined?.

There are four basic possibilities why Collection.findOne(query).key could yield an error:
There is no document matching the query therefore you're trying to reference undefined.key
The key in question doesn't exist in the returned document
The document exists in the database but isn't being published by the server and being subscribed to by the client
The document exists and is published and subscribed to but the subscription is not yet .ready(), i.e. you need to wait before you can access it.
A common defensive pattern is:
const oneDoc = myCollection.findOne(query);
let myVar = oneDoc && oneDoc.key;
if ( myVar ) {
// do the thing
} else {
// handle the error
}

You need to save the number as integer for eventownernnumber (and please write it like eventOwnerNumber, which is a good practice for readability), not string. Either use input type="number" or convert the value to integer like this:
Number(valueHere);
The rest of your query looks fine to me but you don't need limit since you do findOne() and you find the newest inserted doc with noticedate: -1
Another thing is, you need to save the date like this in your insert():
noticeDate: new Date() //your current query should give you the right document after this change