pal-jius-case-study-display-service.js

'use strict';

const Schmervice = require('schmervice');

const internals = {};

module.exports = class DisplayService extends Schmervice.Service {

    companyBasic(companies) {

        const { toCompanyBasic } = DisplayService;
        const { mapResults } = internals;

        return mapResults(companies, toCompanyBasic);
    }
    
    // Load your model up with any extras it needs here!
    async jobBasic(jobs, txn) {

        const { Job } = this.server.models();
        const { toJobBasic } = DisplayService;
        const { mapResults } = internals;

        // See Objection's [fetchGraph](https://vincit.github.io/objection.js/api/model/static-methods.html#static-fetchgraph) if you're unfamiliar with this part
        const jobsGraphed = await Job.fetchGraph(jobs, `[
            company,
            views as viewCount,
            applications as appCount
        ]`, { transaction: txn });

        return mapResults(jobsGraphed, toJobBasic);
    }

    // Load your model up with any extras it needs here!
    async jobDetails(jobs, txn) {

        const { Job } = this.server.models();
        const { toJobDetail } = DisplayService;
        const { mapResults } = internals;

        const jobsGraphed = await Job.fetchGraph(jobs, `[
            company,
            views as viewCount,
            applications as appCount,
            enhancements(active)
        ]`, { transaction: txn });

        return mapResults(jobsGraphed, toJobDetail);
    }

    static toCompanyBasic(company) {

        const {
            id,
            name,
            address,
            city,
            state,
            zip,
            updatedAt,
            createdAt
        } = company;

        return {
            id,
            name,
            address,
            city,
            state,
            zip,
            updatedAt,
            createdAt
        };
    }
    
    static toJobBasic(job) {

        const {
            id,
            title,
            isDeleted,
            appCount,
            viewCount,
            createdAt,
            updatedAt
        } = job;

        const { toCompanyBasic } = DisplayService;

        const [{ count: totalViewCount = 0 } = {}] = viewCount;
        const [{ count: totalAppCount = 0 } = {}] = appCount;

        return {
            id,
            title,
            // Notice here that 'status' and 'stats' are introduced only in this function. There are no db columns for these
            status: ((company && company.isDeleted) || isDeleted) ? 'deleted' : job.getIsActive() ? 'active' : 'inactive',
            stats: {
                views: totalViewCount,
                application: totalAppCount
            },
            createdAt,
            updatedAt,
            company: company && toCompanyBasic(company)
        };
    }

    static toJobDetail(job) {

        const {
            enhancements,
            byline,
            description,
            benefits,
            requirements,
            careerLevel,
            education,
            travel,
            payType
        } = job;

        const { toJobBasic, toMemberBasic, toCategoriesList } = DisplayService;

        return {
            ...toJobBasic(job),
            enhancements,
            byline,
            description,
            benefits,
            requirements,
            careerLevel,
            education,
            travel,
            payType
        };
    }
};

internals.mapResults = (results, mapFunc) => {

    return Array.isArray(results) ? results.map(mapFunc) : mapFunc(results);
};