目前正在将我的 Firestore 发布数据 function 重构为数组存储

Question

Currently I have a dashboard application and when a user adds to their dashboard it does a post request to Firestore to set the data in a certain document. Here is what that code looks like:

export function createEntry(data) { // Data has a authorId key with the value of the UID
  const userEntry = firestore.collection('userEntries').doc();
  userEntry.set(data);
  return userEntry;
}

So above, a new entry gets created with a random ID that I then use to grab the data to display later. To get this information later, I loop through all of the entries to see where the authorId matches the user that is log in to return that.

So what I am trying to do is refactor the code so that each document in 'userEntries' is the ID of the user, authorID: UID, and have it be an array where I can keep pushing items into. In return, I can just grab the user array and map over those items to display instead of looping through all my entries and checking.

What I've tried:

export function createEntry(data) {
  const userEntry = firestore.collection('userEntries').doc(data.authorId);
  userEntry.update({ 
    userData: firebase.firestore.FieldValue.arrayUnion(data)
  })
}

So to sum it up, I would like a way to set the document to users ID and push any future entries into their own array, in which I could easily access from the frontend to display.

Hope you can point me in the right direction, thank you!

Answer 1

You don't actually have to revise the original method. If you have the authorId as a field value, you can just query the data using where clause like this:

const uid = auth.currentUser.uid;
firestore.collection().where('authorId', '==', uid).get();

With this method, you are not getting the entire collection and looping through to see which one is written by the user.