@obsidize/rx-map/relationships/one-to-many-context.js

ES6 Map with rxjs extensions for change detection

import { castArray } from '../common/utility';
/**
 * Simple cache container used to relate a single id to a set of foreign keys.
 * Allows for fast lookup times of one-to-many projections.
 */
export class OneToManyContext {
    constructor(id) {
        this.id = id;
        this.foreignKeySet = new Set();
    }
    clear() {
        this.foreignKeySet.clear();
    }
    getForeignKeys() {
        return Array.from(this.foreignKeySet);
    }
    setForeignKeys(keys) {
        this.clear();
        castArray(keys).forEach(key => this.foreignKeySet.add(key));
    }
}