CODEWITHSUNDEEP
javascriptreactjsreduxreact-redux
Alexander Fedorov
Alexander Fedorov

Reputation: 321

use empty object as initialState in createSlice

I'm trying write reducer for ticket object in my app and I use createSlice for it like this:

    export const ticketSlice = createSlice({
    name: 'ticket',
    initialState: { value: null },
    reducers: {
        ticketSet: (state, action) => {
            state.value = action.payload;
        },
        ticketSetCategory: (state, action) => {
            state.value.category = action.payload;
        }
    }
});

Everything works fine but it's not so convenient to use state.ticket.value in useSelector. I prefer state.ticket instead it. So I changed my reducer like it:

    export const ticketSlice = createSlice({
    name: 'ticket',
    initialState: {},
    reducers: {
        ticketSet: (state, action) => {
            state = action.payload;
        },
        ticketSetCategory: (state, action) => {
            state.category = action.payload;
        }
    }
});

After that, the storage stopped working. The ticket value is always an empty object. What am I doing wrong?

Upvotes: 1

Views: 809

Answers (1)

markerikson
markerikson

Reputation: 67539

state = anything is never a valid statement in an Immer-powered reducer, because it is neither mutating the state, nor returning a new value.

The short answer is that you want return action.payload here to replace the existing state.

For more details, see the extended writeup on this topic in our docs:

https://redux-toolkit.js.org/usage/immer-reducers#resetting-and-replacing-state

Upvotes: 1

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