@terabits/grapi/lib/helper/paginator.js

Grapi Schema Generator For GraphQL Server

"use strict";
exports.__esModule = true;
exports.paginate = void 0;
var lodash_1 = require("../lodash");
var lodash_2 = require("../lodash");
var paginate = function (rows, pagination) {
    if ((0, lodash_2.isEmpty)(pagination) || (0, lodash_2.isEmpty)(rows)) {
        return {
            data: rows,
            total: rows.length,
            hasNextPage: false,
            hasPreviousPage: false
        };
    }
    var transforms = [];
    if (pagination.perPage && pagination.page) {
        var skip = pagination.perPage * (pagination.page - 1);
        var limit = pagination.perPage;
        if (!(0, lodash_2.isUndefined)(skip) && skip > 0) {
            transforms.push((0, lodash_1.slice)(skip));
        }
        if (!(0, lodash_2.isUndefined)(limit)) {
            transforms.push((0, lodash_1.take)(limit));
        }
        var totalPages = Math.ceil(rows.length / pagination.perPage);
        return {
            data: (0, lodash_1.flow)(transforms)(rows),
            total: rows.length,
            hasNextPage: totalPages > pagination.page,
            hasPreviousPage: pagination.page > 1
        };
    }
    var last = pagination.last, first = pagination.first, before = pagination.before, after = pagination.after;
    if (!(0, lodash_2.isUndefined)(before)) {
        transforms.push((0, lodash_1.takeWhile)(function (row) { return row.id !== before; }));
    }
    if (!(0, lodash_2.isUndefined)(after)) {
        transforms.push((0, lodash_1.takeRightWhile)(function (row) { return row.id !== after; }));
    }
    transforms.push(function (rows) {
        if (first && last) {
            if (first > rows.length) {
                var diff = first - rows.length;
                return diff < last ? (0, lodash_1.takeRight)(last - diff, rows) : [];
            }
            else {
                return (0, lodash_1.takeRight)(last, (0, lodash_1.take)(first, rows));
            }
        }
        if (first)
            return (0, lodash_1.take)(first, rows);
        if (last)
            return (0, lodash_1.takeRight)(last, rows);
        return rows;
    });
    var data = (0, lodash_1.flow)(transforms)(rows);
    var firstRowId = (0, lodash_2.get)((0, lodash_2.first)(rows), 'id');
    var firstFilteredDataId = (0, lodash_2.get)((0, lodash_2.first)(data), 'id');
    var lastRowId = (0, lodash_2.get)((0, lodash_2.last)(rows), 'id');
    var lastFilteredDataId = (0, lodash_2.get)((0, lodash_2.last)(data), 'id');
    return {
        data: data,
        total: rows.length,
        hasNextPage: (!(0, lodash_2.isNil)(lastRowId) && !(0, lodash_2.isNil)(lastFilteredDataId) && lastRowId !== lastFilteredDataId),
        hasPreviousPage: (!(0, lodash_2.isNil)(firstRowId) && !(0, lodash_2.isNil)(firstFilteredDataId) && firstRowId !== firstFilteredDataId)
    };
};
exports.paginate = paginate;