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

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

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

    Self.updatePrice = async params => {
        if (!params.price) params.price = 0;

        let model = Self.app.models;
        let manaDiscount;
        let buyerDiscount = await model.ComponentRate.findOne({where: {code: 'buyerDiscount'}});
        let ticket = await getTicket(params);
        let usesMana = await model.WorkerMana.findOne({where: {workerFk: ticket[0].client().salesPersonFk}, fields: 'amount'});
        let currentLine = await Self.app.models.Sale.findOne({where: {id: params.id}});
        let componentId = buyerDiscount.id;

        if (usesMana) {
            manaDiscount = await model.ComponentRate.findOne({where: {code: 'mana'}});
            componentId = manaDiscount.id;
        }
        let value = (params.price - currentLine.price);

        let saleComponent = await Self.app.models.SaleComponent.findOne({
            where: {
                componentFk: componentId,
                saleFk: params.id
            }
        });

        if (saleComponent) {
            saleComponent.updateAttributes({value: saleComponent.value + value}).catch(() => {
                throw new UserError(`Enter a valid number`);
            });
        } else {
            await Self.app.models.SaleComponent.create({
                saleFk: params.id,
                componentFk: componentId,
                value: value
            });
        }

        await currentLine.updateAttributes({price: params.price});

        query = `call vn.manaSpellersRequery(?)`;
        await Self.rawSql(query, [ticket[0].client().salesPersonFk]);
    };

    async function getTicket(params) {
        let model = Self.app.models;
        let thisTicketIsEditable = await model.Ticket.isEditable(params.ticketFk);
        if (!thisTicketIsEditable)
            throw new UserError(`The sales of this ticket can't be modified`);

        return await model.Ticket.find({
            where: {
                id: params.ticketFk
            },
            include: [{
                relation: 'client',
                scope: {
                    fields: ['salesPersonFk']
                }
            }],
            fields: ['id', 'clientFk']
        });
    }
};