salix/modules/ticket/back/methods/sale/updateDiscount.js

let UserError = require('vn-loopback/util/user-error');

module.exports = Self => {
    Self.remoteMethodCtx('updateDiscount', {
        description: 'Changes the discount of a sale',
        accessType: 'WRITE',
        accepts: [{
            arg: 'params',
            type: 'object',
            required: true,
            description: 'sale ID, newDiscount, price',
            http: {source: 'body'}
        }],
        returns: {
            type: 'string',
            root: true
        },
        http: {
            path: `/updateDiscount`,
            verb: 'post'
        }
    });

    Self.updateDiscount = async(ctx, params) => {
        if (isNaN(params.editLines[0].discount))
            throw new UserError(`The value should be a number`);

        let model = Self.app.models;
        let ticket = await model.Ticket.findById(params.editLines[0].ticketFk, {
            include: {
                relation: 'client',
                scope: {
                    fields: ['salesPersonFk']
                }
            },
        });

        if (ticket.refFk)
            throw new UserError(`The sales of this ticket can't be modified`);

        let componentToUse;
        let usesMana = await model.WorkerMana.findOne({where: {workerFk: ticket.client().salesPersonFk}, fields: 'amount'});

        if (usesMana)
            componentToUse = 37;
        else
            componentToUse = 34;

        for (let i = 0; i < params.editLines.length; i++) {
            let currentLine = await model.Sale.findOne({where: {id: params.editLines[i].id}, fields: 'price'});
            let value = ((-currentLine.price * params.editLines[i].discount) / 100);
            await model.SaleComponent.upsert({saleFk: params.editLines[i].id, value: value, componentFk: componentToUse});

            await model.Sale.update({id: params.editLines[i].id}, {discount: params.editLines[i].discount});
        }

        if (usesMana) {
            query = `
            call vn.manaSpellersRequery(?)`;
            await Self.rawSql(query, [ticket.client().salesPersonFk]);
        }
    };
};