How to push the user object in the Array in Firebase Firestore

Question

What I did to update that count of the likes and dislikes with Firestore?

const tagDatabase = firebase.firestore().collection("tags").doc(TAGID);
  tagDatabase.get().then((res) => {
    if (res.exists) {
      const getData = res.data();
      setTaginfo(getData);
    }    
  const updateData = {
              _id: tagInfo._id,
              updateAt: new Date(),
              likes: tagInfo.likes - 1,
              dislikes: tagInfo.dislikes + 1,
              status: true,
              user:[{userid:"675",liked:true,disliked:false}]
            };
            tagDatabase.set(updateData);

What to do now to update array by inserting users in the user array of that object in the firebase, I want like below:

 tag={    _id: "7252525",
              updateAt: 15/07/2020,
              likes: 5,
              dislikes: 3,
              status: true,
              user:[{userid:"675",liked:true,disliked:false},
                     {userid:"677",liked:false,disliked:false},
                   {userid:"698",liked:false,disliked:false}]
            }

You will be creating this entire tag object and pushing it isn't, is the question is how to get the output as u mentioned like the tag variable, didn't find the new values to be added. Can you add that method also — Beginner
– Beginner, Commented Jul 21, 2020 at 17:26
I want the same like the tag object should create in Firestore, till now I am adding with that set, I want array update query in the FIrestore to append that users in an array — mahendra Kumar
– mahendra Kumar, Commented Jul 21, 2020 at 17:56

itsam · Accepted Answer · 2020-07-21 20:39:49Z

1

Looks like you need array union operation. Update elements in an array

You can use array union to add new items to an array, and also to remove them. Plus point is that you don't have to read the document beforehand and perform a transaction.

answered Jul 21, 2020 at 20:39

itsam

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