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https://gitcode.com/gh_mirrors/hy/Hydro.git
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20 lines
631 B
JavaScript
20 lines
631 B
JavaScript
const { ValidationError } = require('../error');
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/**
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* @param {import('mongodb').Cursor} cursor
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* @param {number} page
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* @param {number} pageSize
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* @returns {Promise<Array[]>} pageDocs numPages count
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*/
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async function paginate(cursor, page, pageSize) {
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if (page <= 0) throw new ValidationError('page');
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const [count, pageDocs] = await Promise.all([
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cursor.count(),
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cursor.skip((page - 1) * pageSize).limit(pageSize).toArray(),
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]);
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const numPages = Math.floor((count + pageSize - 1) / pageSize);
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return [pageDocs, numPages, count];
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}
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global.Hydro.lib.paginate = module.exports = paginate;
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