Selector returns empty array from the redux state, even though the array has values - redux

Question

I have the following normalized redux state:
rootReducer: {
blocks: {
"key1": {
id: "key1",
beverages: [], // Array of objects
}
}
}
and I'm trying to select the value of beverages for beverage with the id of "key1" using this selector:
export const getBlockBeverages = (state, blockId) => {
console.log("selector", state.blocks[blockId].beverages);
return state.blocks[blockId].beverages;
};
Whenever I add a new beverage into the beverages array, the selector gets called twice, first time with an empty array, second time with proper values:
Initial state
selector []
selector []
Adding new beverage:
selector []
selector [{/*beverage1*/}]
// Adding another beverage
selector []
selector [{/*beverage1*/}, {/*beverage2*/}]
I'd really appreciate any help/explanation why does the selector get called and beverages value for the block instance is an empty array.
Below is the code for reducers I'm using - I don't see where I could be mutating the original state, I used Immer's produce from the beginning and the problem is still present. Then I tried to use lodash.clonedeep to make sure that I return a new state, but the selector still logs that empty array.
const blockReducer = (state = { id: "", beverages: [] }, action) => {
if (action.type === ADD_BEVERAGE_TO_BLOCK) {
const { beverageId } = action.payload;
const newBeverage = { id: uuid4(), beverageId };
return produce(state, (draft) => {
draft.beverages.push(newBeverage);
});
}
return state;
};
const blocks = (state = {}, action) => {
const key = action.payload.key;
if (key && (state[key] || action.type === CREATE_BLOCK)) {
const instanceState = blockReducer(state[key], action);
return produce(state, (draft: any) => {
draft[key] = instanceState;
});
}
return state;
};
Any ideas why the selector returns empty array instead of array of length 0, 1, 2 etc. as I'm adding new beverages? I'm clueless and will appreciate any help.

Answer 1

The problem was in a different selector that I had been using in a wrong way.
export const makeGetBlockBeveragesLength = () => createSelector(
(state, blockId) => getBlockBeverages(state, blockId),
(blockBeverages) => blockBeverages.length,
);
and instead of mapStateToProps I used createMapStateToProps:
const createMapStateToProps = (state, { blockId }) => () => {
const getBlockBeveragesLength = makeGetBlockBeveragesLength();
return {
length: getBlockBeveragesLength(state, blockId),
};
};
export const Component = connect(createMapStateToProps)(MyComponent);
The empty array logged in one of the logs refers to an older state (the initial state in this case).
I fixed the code to this and it works:
export const getBlockBeveragesLength = createSelector(
(state, blockId) => getBlockBeverages(state, blockId),
(blockBeverages) => blockBeverages.length,
);
const mapStateToProps = (state, { blockId }) => ({
length: getBlockBeveragesLength(state, blockId),
});
export const Component = connect(mapStateToProps)(MyComponent);