问题
I have two firestore collections in my app, "users" and "posts". Now I'm trying to create the third collection "userFeed" where all the posts of the followed users can be stored. How can i follow the users like in Instagram so that all the followed users' posts are stored in the 'userFeed' collection? How to query for following a user in a way that his future posts appear in the current user's 'userFeed'?
All the users have to sign with firebase auth so all users have a UID. How do i make the follow user query?
回答1:
I believe the same concern was raised and addressed in this post. Although the response was in Javascript, the basic principle is the same.
来源：https://stackoverflow.com/questions/62194361/how-does-the-follow-user-part-work-like-in-instagram