CODEWITHSUNDEEP
javascriptnode.jsreactjsasync-awaitreact-query
Running moments
Running moments

Reputation: 117

React-query returns Cannot read properties of undefined even though I can see id is set

I am trying to learn react-query and been following quite a few guides. However everytime I try with parameters something goes wrong. This code that I have under just keep telling me that Cannot read properties of undefined (reading 'id') even though the console.log(id) prints out the correct number.

const PracticeList = ({id}) => {
    const idTest = id
    conosole.log(idTest) //this prints 190 and is not undefined
  const { isLoading, isFetching, data, isError } = useQuery(["list",{id:idTest}],GetList,{
      retry:1,
      retryDelay:500
  })
    if (isLoading) {
        return <p>Loading</p>
    }
    if (isError) {
        return <p>Error getting posts...</p>
    }
    return (
        <div> {isFetching && <p>Updating</p>}{data &&<p>{data.lists}</p>}</div>
    )
}

export const GetList = async(key,obj)=>{
    console.log(key,obj) //This prints that key is defined but obj is undefined?

    const {data} = await ShoppingListAPI.get(`/getShoppingList`,{id:obj.id});
    return data;
}

This never really happends as it crashes before, but I do know it works from postman.

import axios from 'axios';
export default axios.create({
    baseURL:"http://localhost:3005/api/v1/",
});

This is where I set the Id btw.

import './App.css';
import {Container, Typography} from '@mui/material'
import AllLists from './AllLists';
import { useState } from 'react';
import ShoppingList2 from './ShoppingList2';
import Practice from './Practice';
import PracticeList from './PracticeList';
function App() {
  const [activeList, setActiveList]= useState(190)
  return (
    <div className="App">
        <Typography>Shopping list</Typography>
        <Container maxWidth="lg">
          <Practice/>
          {activeList&&<PracticeList id={activeList}/>}
        
        </Container>
    </div>
  );
}

export default App;

Upvotes: 2

Views: 4876

Answers (2)

TkDodo
TkDodo

Reputation: 28978

since v3, react-query injects an object called the QueryFunctionContext into the queryFn. It contains the queryKey, among other information.

So if your query is:

useQuery(["list",{id:idTest}],GetList)

you can extract the queryKey in GetList via:

const GetList = (queryFunctionContext) => {
  const queryKey = queryFunctionContext.queryKey
}

queryKey[0] will then be "list" and queryKey[1] should be your object that contains the id.

Upvotes: 3

Yoel
Yoel

Reputation: 7985

try this

()=>GetList(idTest)

const { isLoading, isFetching, data, isError } = useQuery(["list",{id:idTest}],()=>GetList(idTest),{

Upvotes: 0

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