siimee/backend/lib/services/membership.js

'use strict';

const Schmervice = require('@hapipal/schmervice');

module.exports = class MembershipService extends Schmervice.Service {
    constructor(...args) {
        super(...args)
    }
    async findGroupingsById(id) {
        const { Membership, Grouping } = this.server.models()

        /** Grab every Membership associated with this id */
        const allMemberships = await Membership.query()
            .throwIfNotFound()
            .where('user_id', id)

        /** Copy a list of the just the Groupings */
        const groupingIdsToGrab = allMemberships.map(membership => membership.grouping_id)

        /** Uncomment to dedupe the list just in case */
        const dedupedGroupings = [...new Set(groupingIdsToGrab)]

        /** Grab just the Groupings this id has a Membership for */
        return await Grouping.query()
            .throwIfNotFound()
            .whereIn('grouping_id', dedupedGroupings)
    }
}