something is working

node_modules/mongoose/lib/helpers/query/wrapThunk.js

@@ -0,0 +1,31 @@
+'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);
+  };
+};