I'm using Redux Toolkit for the first time. Data is successfully available in the console, but when i try to render data in the UI, i'm getting undefined JSON path {${weather[0].description} ${weather[0].main}} Maybe i need to check something with if() statement but i don't know how and where. My own if() solution didn't do the trick in App.js
JSON data
description: "broken clouds"
icon: "04n"
id: 803
main: "Clouds"
[[Prototype]]: Object
length: 1
[[Prototype]]: Array(0)
App.js side
import { useDispatch, useSelector } from 'react-redux';
import { fetchWeatherAction } from './redux/slices/weatherSlices';
function App() {
const dispatch = useDispatch();
useEffect(() => {
dispatch(fetchWeatherAction('Seoul'));
}, []);
const state = useSelector(state => state.weather);
const { loading, weather, error } = state || {};
if(!weather){
return null
}
console.log(weather);
return (
<div className="App">
<header className="App-header">
{weather.map((weather, index) => (
<div key={index}>
<div>{`${weather[0].description} ${weather[0].main}`}</div>
</div>
))}
</header>
</div>
);
}
export default App;```
Redux Toolkit side
``` import { createAsyncThunk, createSlice } from '@reduxjs/toolkit';
import axios from 'axios';
export const fetchWeatherAction = createAsyncThunk(
'weather/fetch',
async (payload, {rejectWithValue, getState, dispatch})=>{
try{
const {data} = await axios.get(`http://api.openweathermap.org/data/2.5/weather?q=${payload}&appid=7469e38d322111e34a7027db2eee39c3`);
return data;
}catch(error){
if(!error?.response){
throw error
}
return rejectWithValue(error?.response?.data);
}
}
);
const weatherSlice = createSlice({
name: 'weather',
initialState: {},
extraReducers: builder => {
builder.addCase(fetchWeatherAction.pending, (state, action) => {
state.loading = true;
});
builder.addCase(fetchWeatherAction.fulfilled, (state, action) => {
state.weather = action?.payload;
state.loading = false;
state.error = undefined;
});
builder.addCase(fetchWeatherAction.rejected, (state, action) => {
state.loading = false;
state.weather = undefined;
state.error = action?.payload;
})
},
});
export default weatherSlice.reducer;```
It appears that you are mapping weather, which looks like an array of objects, and then trying to index into that object as e.g. weather[0].... If weather inside the map operation is in fact an object and not an array, this will not work. I think what you want is something like the following. Note that I've changed the name of the interior variable to weatherItem for clarity:
{weather.map((weatherItem, index) => (
<div key={index}>
<div>{`${weatherItem.description} ${weatherItem.main}`}</div>
</div>
))}