gegi•2mo ago

Hello, is it possible to see, what data

Hello, is it possible to see, what data exactly added/updated in my useQuery?

5 Replies

Sara•2mo ago

Can you elaborate please? If you've changed something with a mutation, you can potentially return the result of what was updated with table triggers, For the query itself, I'm not quite sure how to go by this, I'd run a compare function and safe the previous data in a memo, I could dig deeper into the useQuery code and find out, but the first option is the simplest one

Sara•2mo ago

https://stack.convex.dev/triggers From the convex-helpers package

Database Triggers

Triggers automatically run code whenever data in a table changes. A library in the convex-helpers npm package allows you to attach trigger functions t...

Sara•2mo ago

I'll look into it today, sounds interesting to figure out how this works https://github.com/get-convex/convex-js/blob/main/src/react/use_queries.ts

GitHub

convex-js/src/react/use_queries.ts at main · get-convex/convex-js

TypeScript/JavaScript client library for Convex. Contribute to get-convex/convex-js development by creating an account on GitHub.

gegiOP•2mo ago

For example, I have a list of online status of users, and I want to know, which users status changed without to have to compare it with prev states I thought maybe useQuery has something out of the box, to retrieve only the changed ids

Sara•2mo ago

I tried for like 20 min to figure it out, and I don't think I'm gonna put much more work into it,

  const convex = useConvex();
  useEffect(()=>{
    const watcher = convex.watchQuery(api.drawing.viewAll);
    console.log(watcher.localQueryResult())
    
  },[convex])

  const convex = useConvex();
  useEffect(()=>{
    const watcher = convex.watchQuery(api.drawing.viewAll);
    console.log(watcher.localQueryResult())
    
  },[convex])

this only returns undefined for me, which makes sense since the class is private and there's no getter for it, localQueryResult is the cached version, you could potentially run a simple compare function, I'd use a Set, and filter against the data that's not found, and return that elemnt, you can potentially do this with react if you could find out how to track useMemo

Hello, is it possible to see, what data

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