salix/modules/ticket/back/models/stowaway.js

const LoopBackContext = require('loopback-context');
const UserError = require('vn-loopback/util/user-error');

module.exports = function(Self) {
    Self.observe('before save', async function(ctx) {
        let isStowaway = await Self.app.models.Ticket.canBeStowawayed(ctx.instance.id);

        if (!isStowaway)
            throw new UserError(`Can't create stowaway for this ticket`);

        if (ctx.isNewInstance) {
            let where = {
                code: 'BOARDING'
            };
            let state = await Self.app.models.State.findOne({where});
            let params = {ticketFk: ctx.instance.id, stateFk: state.id};
            const loopBackContext = LoopBackContext.getCurrentContext();

            let httpCtx = {req: loopBackContext.active};
            await Self.app.models.TicketTracking.changeState(httpCtx, params);
        }
    });
};