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'use strict'; const handleCallback = require('../utils').handleCallback; const OperationBase = require('./operation').OperationBase; const toError = require('../utils').toError; class FindOneOperation extends OperationBase { constructor(collection, query, options) { super(options); this.collection = collection; this.query = query; } execute(callback) { const coll = this.collection; const query = this.query; const options = this.options; try { const cursor = coll .find(query, options) .limit(-1) .batchSize(1); // Return the item cursor.next((err, item) => { if (err != null) return handleCallback(callback, toError(err), null); handleCallback(callback, null, item); }); } catch (e) { callback(e); } } } module.exports = FindOneOperation;
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