Swift Firebase更新旧数据-实时数据库触发器

Question

In the below image I have messages in my app, yet when a user say updates their profile image or name the data below becomes stale data. I have come across "Firebase Functions" and see that I can keep this data in-sync if I use Firebase Functions. Yet, only knowing Swift I am unsure how to implement Firebase Functions to keep my messages in-sync which the changing data in the user profiles. Can someone help me point in the right direction on how I implement this into my project? Haven't found any sample code in swift or any tutorials for that matter. Any help is greatly appreciated!

Answer 1

Based on the comments and the structure in the question, the reason the data is becoming stale is due to how the data is stored in Firebase.

One option is that when a message is sent, a node is written with the message and then a reference to the senders info. That keeps everything fresh and up-to-date at all times

So say we have a users node with users stored with the users UID as the key to each node

users
   uid_0
     user_name: "Peter"
     user_age:  "32"
     gender:    "Male"
     business_name: "Peter's Plumbing Place"
     url: "http:...."
     type: "Customer"
   uid_1
     user_name: "Ralph"
     user_age:  "47"
     gener:     "Male"
     business_name: "Ralph's Repair Room"
     url: "http:...."
     type: "Employee"

then we have messages

messages
   msg_0
     msg_text: "Here's a message!"
     from_uid: "uid_0"
     to_uid:   "uid_1"
     timestamp: "20180110"

Then, user uid_1 adds a query observer to the messages node for any messages where to_uid is uid_1 so they are notified of the incoming message. When they receive it, they will also know it was sent by uid_0 and can pull up their name, profile image, age etc.

That way, all data is kept in sync and current and no stale data exists.

This is a typical implementation of a structure for a messaging app.