@ngxs-labs/entity-state
Version:
<p align="center"> <img src="https://raw.githubusercontent.com/ngxs-labs/emitter/master/docs/assets/logo.png"> </p>
62 lines • 10.2 kB
JavaScript
import { asArray, mustGetActive } from '../internal';
import { InvalidIdError, NoSuchEntityError, UpdateFailedError } from '../errors';
/**
* Updates the given entities in the state.
* Entities will be merged with the given `onUpdate` function.
* @param payload the updated entities
* @param idKey key of the id-field of an entity
* @param onUpdate update function to call on each entity
*/
export function update(payload, idKey, onUpdate) {
return (state) => {
let entities = Object.assign({}, state.entities); // create copy
const affected = getAffectedValues(Object.values(entities), payload.selector, idKey);
if (typeof payload.data === 'function') {
affected.forEach(entity => {
entities = updateDictionary(entities, payload.data(entity), entity[idKey], onUpdate);
});
}
else {
affected.forEach(entity => {
entities = updateDictionary(entities, payload.data, entity[idKey], onUpdate);
});
}
return Object.assign(Object.assign({}, state), { entities, lastUpdated: Date.now() });
};
}
export function updateActive(payload, idKey, onUpdate) {
return (state) => {
const { id: activeId, active } = mustGetActive(state);
const { entities } = state;
if (typeof payload === 'function') {
return Object.assign(Object.assign({}, state), { entities: updateDictionary(entities, payload(active), activeId, onUpdate), lastUpdated: Date.now() });
}
else {
return Object.assign(Object.assign({}, state), { entities: updateDictionary(entities, payload, activeId, onUpdate), lastUpdated: Date.now() });
}
};
}
export function updateDictionary(entities, entity, id, onUpdate) {
if (id === undefined) {
throw new UpdateFailedError(new InvalidIdError(id));
}
const current = entities[id];
if (current === undefined) {
throw new UpdateFailedError(new NoSuchEntityError(id));
}
const updated = onUpdate(current, entity);
return Object.assign(Object.assign({}, entities), { [id]: updated });
}
function getAffectedValues(entities, selector, idKey) {
if (selector === null) {
return entities;
}
else if (typeof selector === 'function') {
return entities.filter(entity => selector(entity));
}
else {
const ids = asArray(selector);
return entities.filter(entity => ids.includes(entity[idKey]));
}
}
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