Andy Ray Andy Ray - 3 months ago 17
Javascript Question

getState in redux-saga?

I have a store with a list of items. When my app first loads, I need to deserialize the items, as in create some in-memory objects based on the items. The items are stored in my redux store and handled by an

itemsReducer
.

I'm trying to use redux-saga to handle the deserialization, as a side effect. On first page load, I dispatch an action:

dispatch( deserializeItems() );


My saga is set up simply:

function* deserialize( action ) {
// How to getState here??
yield put({ type: 'DESERISLIZE_COMPLETE' });
}

function* mySaga() {
yield* takeEvery( 'DESERIALIZE', deserialize );
}


In my deserialize saga, where I want to handle the side effect of creating in-memory versions of my items, I need to read the existing data from the store. I'm not sure how to do that here, or if that's a pattern I should even be attempting with redux-saga.

Answer

you can use select effect

import {select, ...} from 'redux-saga/effects'

function* deserialize( action ) {
    const state = yield select();
    ....
    yield put({ type: 'DESERISLIZE_COMPLETE' });
}

also you can use it with selectors

const getItems = state => state.items;

function* deserialize( action ) {
    const items = yield select(getItems);
    ....
    yield put({ type: 'DESERISLIZE_COMPLETE' });
}
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