CODEWITHSUNDEEP
firebasefluttergoogle-cloud-firestore
Nour
Nour

Reputation: 11

How to structure a like query in Firestore?

I'm building a simple application where posts appear on a user's home page and he can like or unlike them. first when there were no users in the applications, I made a simple boolean field "liked", as shown in the figure, to determine if a post is liked or un-liked. However, when I started working with users, I find it hard to find the perfect structure for the likes field.

In Firestore, I added a field named "likedBy" for each post, which contains a map with a key of each user's id and a boolean to determine if the user liked the post or not.

enter image description here

I don't know if this structure is suitable or not, and if not, is there a better way to reach my goal?

Upvotes: 1

Views: 603

Answers (2)

Thierry
Thierry

Reputation: 8383

I would recommend going one step further and save more than the User ID. You could also save the User displayName and photoUrl. That way, you don't need to read ($$$$money$$$$) the documents of every Users who liked Posts in order to display their name and/or avatar.

Upvotes: 1

Eilon
Eilon

Reputation: 2982

The likedBy field is enough to cover most use cases.
Just store in likedBy an array of all users who liked the post by user ID. When a user likes - add the user ID to the array and remove it upon unlike.
That means you can also remove the likes and liked field as you can get it from reading the likedBy array.

Upvotes: 1

Related Questions