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'use strict';
const MongooseError = require('../../error/mongooseError');
/** * A query thunk is the function responsible for sending the query to MongoDB, * like `Query#_findOne()` or `Query#_execUpdate()`. The `Query#exec()` function * calls a thunk. The term "thunk" here is the traditional Node.js definition: * a function that takes exactly 1 parameter, a callback. * * This function defines common behavior for all query thunks. * @param {Function} fn * @api private */
module.exports = function wrapThunk(fn) {  return function _wrappedThunk(cb) {    if (this._executionStack != null) {      let str = this.toString();      if (str.length > 60) {        str = str.slice(0, 60) + '...';      }      const err = new MongooseError('Query was already executed: ' + str);      err.originalStack = this._executionStack.stack;      return cb(err);    }    this._executionStack = new Error();
    fn.call(this, cb);  };};