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

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

module.exports = Self => {
    require('../methods/sale/getClaimableFromTicket')(Self);
    require('../methods/sale/reserve')(Self);
    require('../methods/sale/deleteSales')(Self);
    require('../methods/sale/updatePrice')(Self);
    require('../methods/sale/updateQuantity')(Self);
    require('../methods/sale/updateConcept')(Self);
    require('../methods/sale/recalculatePrice')(Self);
    require('../methods/sale/refund')(Self);
    require('../methods/sale/canEdit')(Self);
    require('../methods/sale/usesMana')(Self);

    Self.validatesPresenceOf('concept', {
        message: `Concept cannot be blank`
    });

    Self.observe('before save', async ctx => {
        const models = Self.app.models;
        const changes = ctx.data || ctx.instance;
        const instance = ctx.currentInstance;

        const newQuantity = changes?.quantity;
        if (newQuantity == null) return;

        const loopBackContext = LoopBackContext.getCurrentContext();
        ctx.req = loopBackContext.active;
        if (await models.ACL.checkAccessAcl(ctx, 'Sale', 'canForceQuantity', 'WRITE')) return;

        const ticketId = changes?.ticketFk || instance?.ticketFk;
        const itemId = changes?.itemFk || instance?.itemFk;

        const ticket = await models.Ticket.findById(
            ticketId,
            {
                fields: ['id', 'clientFk', 'warehouseFk', 'shipped'],
                include: {
                    relation: 'client',
                    scope: {
                        fields: ['id', 'clientTypeFk'],
                        include: {
                            relation: 'type',
                            scope: {
                                fields: ['code', 'description']
                            }
                        }
                    }
                }
            },
            ctx.options);
        if (ticket?.client()?.type()?.code === 'loses') return;

        const isRefund = await models.TicketRefund.findOne({
            fields: ['id'],
            where: {refundTicketFk: ticketId}
        }, ctx.options);
        if (isRefund) return;

        if (newQuantity < 0)
            throw new UserError('You can only add negative amounts in refund tickets');

        const item = await models.Item.findOne({
            fields: ['family', 'minQuantity'],
            where: {id: itemId},
        }, ctx.options);

        if (item.family == 'EMB') return;

        const itemInfo = await models.Item.getVisibleAvailable(
            itemId,
            ticket.warehouseFk,
            ticket.shipped,
            ctx.options
        );

        const oldQuantity = instance?.quantity ?? null;
        const quantityAdded = newQuantity - oldQuantity;
        if (itemInfo.available < quantityAdded)
            throw new UserError(`This item is not available`);

        if (await models.ACL.checkAccessAcl(ctx, 'Ticket', 'isRoleAdvanced', '*')) return;

        if (newQuantity < item.minQuantity && itemInfo.available != newQuantity)
            throw new UserError('The amount cannot be less than the minimum');

        if (!ctx.isNewInstance && newQuantity > oldQuantity)
            throw new UserError('The new quantity should be smaller than the old one');
    });
};