salix/print/templates/reports/expedition-pallet-label/expedition-pallet-label.js

const Component = require(`vn-print/core/component`);
const reportBody = new Component('report-body');
const UserError = require('vn-loopback/util/user-error');
const qrcode = require('qrcode');

module.exports = {
    name: 'expedition-pallet-label',
    props: {
        id: {
            type: Number,
            required: true,
            description: 'The pallet id'
        },
        userFk: {
            type: Number,
            required: true,
            description: 'The user id'
        }
    },
    async serverPrefetch() {
        this.labelsData = await this.rawSqlFromDef('labelData', this.id);
        this.username = await this.findOneFromDef('username', this.userFk);
        this.labelData = this.labelsData[0];

        let QRdata = JSON.stringify({
            company: 'vnl',
            user: this.userFk,
            created: new Date(),
            table: 'expeditionPallet',
            id: this.id
        });

        this.QR = await this.getQR(QRdata);
        if (!this.labelsData.length)
            throw new UserError('Empty data source');
    },
    methods: {
        getQR(id) {
            const data = String(id);
            return qrcode.toDataURL(data, {margin: 0});
        },
    },
    components: {
        'report-body': reportBody.build()
    },
};