salix/modules/client/back/models/receipt.js

const LoopBackContext = require('loopback-context');

module.exports = function(Self) {
    require('../methods/receipt/filter')(Self);

    Self.validateBinded('amountPaid', isNotZero, {
        message: 'Amount cannot be zero',
        allowNull: false,
        allowBlank: false
    });

    function isNotZero(value) {
        return !isNaN(value) && value != 0;
    }

    Self.validateAsync('companyFk', isOfficialCompany, {
        message: 'Company has to be official'
    });

    async function isOfficialCompany(err, done) {
        const hasCompany = await Self.app.models.Company.exists(this.companyFk);
        if (!hasCompany) err();
        done();
    }

    Self.observe('before save', async function(ctx) {
        if (ctx.isNewInstance) {
            const loopBackContext = LoopBackContext.getCurrentContext();
            ctx.instance.workerFk = loopBackContext.active.accessToken.userId;
            await Self.app.models.Till.create({
                workerFk: ctx.instance.workerFk,
                bankFk: ctx.instance.bankFk,
                in: ctx.instance.amountPaid,
                concept: ctx.instance.description,
                dated: ctx.instance.payed,
                serie: 'A',
                isAccountable: true,
                number: ctx.instance.clientFk,
                companyFk: ctx.instance.companyFk
            });
        }
    });
};