@webda/core/lib/stores/aggregator.js

Expose API with Lambda

import MapperService, { MapperParameters } from "./mapper.js";
export class AggregatorParameters extends MapperParameters {
    constructor(params) {
        super(params);
        this.key ?? (this.key = "index");
    }
}
/**
 * Service that aggregate several CoreModel into one
 *
 * Similar to a Mapper except that the target is constant
 *
 * @WebdaModda Aggregator
 */
export default class AggregatorService extends MapperService {
    /**
     * Create index if not existing
     *
     * @inheritdoc
     */
    async init() {
        await this.createAggregate();
        return this;
    }
    /**
     * @override
     */
    loadParameters(params) {
        return new AggregatorParameters(params);
    }
    /**
     * Make sure the aggregate document exist
     */
    async createAggregate() {
        if (!(await this.targetStore.exists(this.parameters.key))) {
            await this.targetStore.save({
                uuid: this.parameters.key
            });
        }
    }
    /**
     * Create an aggregation
     *
     * @param object
     * @param updates
     * @returns
     */
    async handleMap(object, updates) {
        let mapUpdates = {};
        if (typeof updates === "object") {
            let toUpdate = false;
            for (let i in updates) {
                if (this.parameters.fields.indexOf(i) >= 0) {
                    toUpdate = true;
                }
            }
            if (!toUpdate) {
                return;
            }
        }
        else if (updates === "deleted") {
            await this.targetStore.removeAttribute(this.parameters.key, object.getUuid());
            return;
        }
        else if (updates === "created") {
            updates = object;
        }
        // Create mapper
        let mapper = {};
        this.parameters.fields.forEach(id => {
            mapper[id] = updates[id];
        });
        mapUpdates[object.getUuid()] = mapper;
        mapUpdates._lastUpdate = new Date();
        // @ts-ignore
        await this.targetStore._patch(mapUpdates, this.parameters.key);
    }
}
export { AggregatorService };
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