@spartacus/core
Version:
Spartacus - the core framework
56 lines • 7.73 kB
JavaScript
export const initialEntityState = { entities: {} };
/**
* Higher order reducer for reusing reducer logic for multiple entities
*
* Utilizes entityId meta field to target entity by id in actions
*/
export function entityReducer(entityType, reducer) {
return (state = initialEntityState, action) => {
let ids;
let partitionPayload = false;
if (action.meta &&
action.meta.entityType === entityType &&
action.meta.entityId !== undefined) {
ids = [].concat(action.meta.entityId);
// remove selected entities
if (action.meta.entityRemove) {
if (action.meta.entityId === null) {
return initialEntityState;
}
else {
let removed = false;
const newEntities = Object.keys(state.entities).reduce((acc, cur) => {
if (ids.includes(cur)) {
removed = true;
}
else {
acc[cur] = state.entities[cur];
}
return acc;
}, {});
return removed ? { entities: newEntities } : state;
}
}
partitionPayload =
Array.isArray(action.meta.entityId) && Array.isArray(action.payload);
}
else {
ids = Object.keys(state.entities);
}
const entityUpdates = {};
for (let i = 0; i < ids.length; i++) {
const id = ids[i];
const subAction = partitionPayload
? Object.assign(Object.assign({}, action), { payload: action.payload[i] }) : action;
const newState = reducer(state.entities[id], subAction);
if (newState) {
entityUpdates[id] = newState;
}
}
if (Object.keys(entityUpdates).length > 0) {
return Object.assign(Object.assign({}, state), { entities: Object.assign(Object.assign({}, state.entities), entityUpdates) });
}
return state;
};
}
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