mailtrain/lib/dt-helpers.js

'use strict';

const knex = require('../lib/knex');

async function ajaxList(params, queryFun, columns) {
    return await knex.transaction(async (tx) => {
        const query = queryFun(tx);

        if (params.operation === 'getBy') {
            query.whereIn(columns[parseInt(params.column)], params.values);
            query.select(columns);

            const rows = await query;
            const rowsOfArray = rows.map(row => Object.keys(row).map(key => row[key]));
            return rowsOfArray;

        } else {
            const recordsTotalQuery = query.clone().count('* as recordsTotal').first();
            const recordsTotal = (await recordsTotalQuery).recordsTotal;

            query.where(function() {
                let searchVal = '%' + params.search.value.replace(/\\/g, '\\\\').replace(/([%_])/g, '\\$1') + '%';
                for (let colIdx = 0; colIdx < params.columns.length; colIdx++) {
                    const col = params.columns[colIdx];
                    if (col.searchable) {
                        this.orWhere(columns[parseInt(col.data)], 'like', searchVal);
                    }
                }
            });

            const recordsFilteredQuery = query.clone().count('* as recordsFiltered').first();
            const recordsFiltered = (await recordsFilteredQuery).recordsFiltered;

            query.offset(parseInt(params.start));

            const limit = parseInt(params.length);
            if (limit >= 0) {
                query.limit(limit);
            }

            query.select(columns);

            for (const order of params.order) {
                query.orderBy(columns[params.columns[order.column].data], order.dir);
            }

            query.options({rowsAsArray:true});

            const rows = await query;
            const rowsOfArray = rows.map(row => Object.keys(row).map(field => row[field]));

            const result = {
                draw: params.draw,
                recordsTotal,
                recordsFiltered,
                data: rowsOfArray
            };

            return result;
        }
    });
}

module.exports = {
    ajaxList
};