Bogdan Posts - Convex Community

Bogdan

•Created by Bogdan on 9/17/2023 in #support-community

Can i check equality like this?

the docs say to use combining operators if you want to for example return all documents where the name is either "Alex" or "Emma"

// Get all users named "Alex" or "Emma".
const usersNamedAlexOrEmma = await ctx.db
  .query("users")
  .filter((q) =>
    q.or(q.eq(q.field("name"), "Alex"), q.eq(q.field("name"), "Emma"))
  )
  .collect();

// Get all users named "Alex" or "Emma".
const usersNamedAlexOrEmma = await ctx.db
  .query("users")
  .filter((q) =>
    q.or(q.eq(q.field("name"), "Alex"), q.eq(q.field("name"), "Emma"))
  )
  .collect();

but i found that you could also do

const usersNamedAlexOrEmma = await ctx.db
  .query("users")
  .filter((q) =>
    q.eq(q.field("name"), "Alex" || "Emma")
  )
  .collect();

const usersNamedAlexOrEmma = await ctx.db
  .query("users")
  .filter((q) =>
    q.eq(q.field("name"), "Alex" || "Emma")
  )
  .collect();

is there a reason i should not use the ladder? it reads much better imo.

3 replies

CCConvex Community

•Created by Bogdan on 9/12/2023 in #support-community

Handle client disconnecting?

On the backend, how would i listen for a client disconnecting? With socket.io i could just add a socket.on("disconnect", callbackFn()) to handle this, is there something similar built into convex? i thought about using beforeunload but it's unreliable. any ideas or suggestions?

55 replies

CCConvex Community

•Created by Bogdan on 9/11/2023 in #support-community

Could not resolve "crypto"

I am trying to have a function that generates a code and returns it to the react client.

import crypto from 'crypto'
import { mutation } from "./_generated/server";

export const getSessionId = mutation({
    args: {},
    handler: async (ctx) => {
        let sessionId = generateCode()
        await ctx.db.insert("rooms", {sessionId: sessionId});
        return sessionId
    }
})

function generateCode() {
    return crypto.randomBytes(3).toString('hex').toUpperCase()
}

import crypto from 'crypto'
import { mutation } from "./_generated/server";

export const getSessionId = mutation({
    args: {},
    handler: async (ctx) => {
        let sessionId = generateCode()
        await ctx.db.insert("rooms", {sessionId: sessionId});
        return sessionId
    }
})

function generateCode() {
    return crypto.randomBytes(3).toString('hex').toUpperCase()
}

but then i get this error:

✘ [ERROR] Could not resolve "crypto"

    src/convex/room.ts:1:19:
      1 │ import crypto from 'crypto'

✘ [ERROR] Could not resolve "crypto"

    src/convex/room.ts:1:19:
      1 │ import crypto from 'crypto'

how would i resolve this? i also feel as though there is a gap in my understanding of how convex is supposed to work .

6 replies