salix/print/templates/reports/supplier-campaign-metrics/supplier-campaign-metrics.js

const Component = require(`vn-print/core/component`);
const reportHeader = new Component('report-header');
const reportFooter = new Component('report-footer');

module.exports = {
    name: 'supplier-campaign-metrics',
    async serverPrefetch() {
        this.supplier = await this.fetchSupplier(this.id);
        let entries = await this.fetchEntries(this.id, this.from, this.to);

        const entriesId = [];

        for (let entry of entries)
            entriesId.push(entry.id);

        const buys = await this.fetchBuys(entriesId);

        const entriesMap = new Map();
        for (let entry of entries)
            entriesMap.set(entry.id, entry);

        for (let buy of buys) {
            const entry = entriesMap.get(buy.entryFk);
            if (entry) {
                if (!entry.buys) entry.buys = [];

                entry.buys.push(buy);
            }
        }

        this.entries = entries;
        if (!this.supplier)
            throw new Error('Something went wrong');
    },
    methods: {
        fetchSupplier(supplierId) {
            return this.findOneFromDef('supplier', [supplierId]);
        },
        fetchEntries(supplierId, from, to) {
            return this.rawSqlFromDef('entries', [supplierId, from, to]);
        },
        fetchBuys(entriesId) {
            return this.rawSqlFromDef('buys', [entriesId]);
        }
    },
    components: {
        'report-header': reportHeader.build(),
        'report-footer': reportFooter.build()
    },
    props: {
        id: {
            type: Number,
            required: true,
            description: 'The supplier id'
        },
        from: {
            required: true
        },
        to: {
            required: true
        }
    }
};