I am trying to remove one element from array of objects in MongoDB.
Please find the schema structure below.
I just want to remove one object by status, ideaID and invitedBy. Please find the query I am using for it,
await User.findByIdAndUpdate(
currentUser,
{ $pull: { "invitationStatus.ideaId": this.req.body.ideaId, "invitationStatus.status": "pending", "invitationStatus.invitedBy": getUserByNotificationId.createdBy._id } })
but this query is not removing the specified object.
You have to specify from which field you want to pull item. Change your query like this:
await User.findByIdAndUpdate(currentUser, {
$pull: {
invitationStatus: {
ideaId: this.req.body.ideaId,
status: "pending",
invitedBy: getUserByNotificationId.createdBy._id
}
}
})
Related
I've got a chat schema that looks like that:
var chatSchema = new mongoose.Schema({
users: [{
type: mongoose.Schema.Types.ObjectId,
required: true
}]
});
It contains array of user IDs.
Now I want to find one chat document that contains an array of two user IDs.
At the beginning I tried to do this:
Chat.findOne({ users: { $in: [req.user_id, receiver._id] }})
.then(chat => { })
But it seems that every time it gives me the chat that contains at least one of the IDs I mentioned in the query.
So I've tried to change it to this but with no luck:
Chat.findOne()
.where({ users: { $in: [req.user_id] }})
.where({ users: { $in: [receiver._id] }})
.then(chat => { })
I need to find the chat that contains both of the user ID's inside the users array otherwise I expect for a null value.
How can I achieve this goal?
Thanks!
This is the way $in works - returns the document when at least one value matches. You should use $all instead:
Chat.findOne({ users: { $all: [req.user_id, receiver._id] }})
// my db structure now
rcv : {
visible: 'all',
ids: [
[0] : userId,
[1] : user2Id ]
}
this is how i query to get the data it works.
//service.ts
getAlbumByUserId(userId) {
return this.afs.collection('albums', ref => ref.where('rcv.visible', '==', 'all').where('rcv.ids', 'array-contains', userId)).valueChanges();
}
//component.ts
this.service.getAlbumByUserId(this.userId);
but i want to set the structure like this but i don't know how to query nested objects in firebase
// database structure
rcv : {
visible: 'all',
ids: {
userId: {
id: userId
}
user2Id: {
id: user2Id
}
}
}
You're looking for the array-contains operator, which can check if a field that is an array contains a certain value.
You're already using the correct array-contains operator, but not with the correct syntax. The array-contains operator checks whether any element of your array is exactly the same as the value you pass in. So you need to pass in the complete value that exists in the array:
ref.where('rcv.visible', '==', 'all').where('rcv.ids', 'array-contains', { id: userId })
As you add more data to the array, it may become unfeasible to reproduce the entire array element for the query. In that case, the common approach is to add an additional field where you keep just the IDs.
So you'd end up with one field (say rcv.users) where you keep all details about the receiving users, and one field (say rcv.ids) where you just keep their IDs, and that you use for querying.
I am trying to insert many in mongoDB using mongoose’s .it only save one collection only why
Here is my code
https://codesandbox.io/s/gallant-solomon-o91wp
I save like that
app.get("/saveData", async () => {
try {
const data = [
{
empid: "test123",
date: "19-Jul-2019"
},
{
empid: "test13",
date: "18-Jul-2019"
},
{
empid: "test13",
date: "11-Jul-2019"
}
];
console.log("before save");
let saveBlog = await BlogPostModel.collection.insertMany(data, {
checkKeys: false
}); //when fail its goes to catch
console.log(saveBlog); //when success it print.
console.log("saveBlog save");
} catch (error) {
console.log(error);
}
});
try to fetch data like that
app.get("/filter", async (req, res) => {
try {
let filterBlog = await BlogPostModel.find({});
//when fail its goes to catch
console.log(filterBlog); //when success it print.
res.send(filterBlog);
} catch (error) {
console.log(error);
}
});
showing only one document
So, here as i suspected, there is one more index present in the collection you created i.e blogposts. the index is id [key id name id_1].
Here is your whole project, i have added in glitch.
Demo
and here i also have added one api /indexes , this retrieves all indexes of the collection. by default _id should be there, additional indexes are added after. so here you can see id, which needs to be unique.
i have made few more changes to your code.
The route /saveData now able to insert records. and it has the field called id which is unique.
but, the old route that is now at /saveData_old, which will give you error as there are no keys that represents this index key [id]. [also after inserting one, it will have id null and rest will fail, just causing duplicate ]
now you can either use id key with unique values, or if you don't need you can also drop the index as well. you can find an answer here for how to drop index.
Using Mongoose, How can I add more items to an object without replacing existing ones?
User.findOneAndUpdate(
{ userId: 0 },
{ userObjects: { newItem: value } }
);
The problem with above code is that it clears whatever was there before and replaces it with newItem when I wanted it just to add another item to userObjects(Like push function for javascript arrays).
Use dot notation to specify the field to update/add particular fields in an embedded document.
User.findOneAndUpdate(
{ userId: 0 },
{ "userObjects.newerItem": newervalue } }
);
or
User.findOneAndUpdate(
{ userId: 0 },
{ "$set":{"userObjects.newerItem": newervalue } }
);
or Use $mergeObjects aggregation operator to update the existing obj by passing new objects
User.findOneAndUpdate(
{"userId":0},
[{"$set":{
"userObjects":{
"$mergeObjects":[
"$userObjects",
{"newerItem":"newervalue","newestItem":"newestvalue"}
]
}
}}]
)
According to your question, i am guessing userObjects is an array.
You can try $push to insert items into the array.
User.findOneAndUpdate(
{ userId: 0 },
{ $push : {"userObjects": { newItem: value } }},
{safe :true , upsert : true},function(err,model)
{
...
});
For more info, read MongoDB $push reference.
Hope it helps you. If you had provided the schema, i could have helped better.
Just create new collection called UserObjects and do something like this.
UserObject.Insert({ userId: 0, newItem: value }, function(err,newObject){
});
Whenever you want to get these user objects from a user then you can do it using monogoose's query population to populate parent objects with related data in other collections. If not, then your best bet is to just make the userObjects an array.
I have the following data structure for my users in my mongodb:
{
_id: "someId",
profile: {
username: "oliv",
friendRequests: [
{ fromUserId: "anId", accepted: false, created: "someDate"},
{ fromUserId: "otherId", accepted: true, created: "otherDate"}
]
}
I'd like to retrieve the user objects that are referenced in my logged user's friendsRequested.
So I tried something like this:
Meteor.users.find({_id: {$in: Meteor.user().profile.friendRequests.fromUserId}});
// FYI: Meteor.users is the collection and Meteor.user() retrieves the current user
But it's not working. I'm assuming it's because of the nested array.
Is there any way of telling mongo to iterate through the fromUserId or something?
Thanks
Change your query to:
Meteor.users.find({_id: {$in: _.pluck(Meteor.user().profile.friendRequests, 'fromUserId') }});
Reasoning:
friendRequests is an array of objects, and $in wants an array of strings(the ids), using _.pluck you're able to pass an array of objects, and tell _ to only return the field fromUserId for each object in the array.
Question in comment ("what if I only want to get the ids from friend requests where "accepted" is false?"):
_.pluck(
_.filter(Meteor.user().profile.friendRequests, function (req) {
return !req.accepted;
}),
'fromUserid'
);
Underscore filter docs