The data is provided dynamically and I don't know its value to assign it in initialState. It causes me a bug that I can't deal with.
How to update the object in the state if there was no object in initialState?
filteringSlice.ts:12
Uncaught TypeError: Cannot read properties of undefined (reading 'products')
at addFilter (filteringSlice.ts:12:1)
at createReducer.ts:280:1
at produce (immerClass.ts:94:1)
at createReducer.ts:279:1
at Array.reduce (<anonymous>)
at reducer (createReducer.ts:246:1)
at reducer (createSlice.ts:325:1)
at combination (redux.js:560:1)
at k (<anonymous>:2235:16)
at D (<anonymous>:2251:13)
onChange={(selectedValue) => {
dispatch(
addFilter({
products: { category__name: { filter: selectedValue } },
})
);
}}
import { createSlice } from "@reduxjs/toolkit";
const initialState = {} as any;
const filteringSlice = createSlice({
name: "filtering",
initialState,
reducers: {
addFilter: (state, action) => {
const key = Object.keys(action.payload)[0];
const key2 = Object.keys(action.payload[key])[0];
const values = Object.values(action.payload[key])[0];
//@ts-ignore
state.filters[key][key2] = { ...state.filters[key][key2], ...values };
},
},
});
const { reducer, actions } = filteringSlice;
export const { addFilter } = actions;
export default reducer;
So your state is an empty object at first:
const initialState = {} as any;
But then you're accessing at as if it had a more deeply nested structure:
state.filters[key][key2] = ...
That doesn't work because there is no state['filters'], and no state['filters']['products'], etc.
You need to create every level of this nesting manually for this to work (or think about a better, flatter structure for your state):
/*
action.payload = {
products: {
category__name: {
filter: selectedValue
}
}
}
*/
const key = Object.keys(action.payload)[0]; // 'products'
const key2 = Object.keys(action.payload[key])[0]; // 'category__name'
const values = Object.values(action.payload[key])[0]; // selectedValue
if (!state.filters) {
state.filters = {};
}
if (!state.filters[key]) {
state.filters[key] = {};
}
if (!state.filters[key][key2]) {
state.filters[key][key2] = {};
}
state.filters[key][key2] = { ...state.filters[key][key2], ...values };