Fix cloning made pre hook not able to modify options. Reverted changes in AggregationCursor.

Author: IchirokuXVI

lib/aggregate.js

@@ -95,7 +95,7 @@ Aggregate.prototype.options;
  */
 
 Aggregate.prototype._optionsForExec = function() {
-  const options = clone(this.options || {});
+  const options = this.options || {};
 
   const asyncLocalStorage = this.model()?.db?.base.transactionAsyncLocalStorage?.getStore();
   if (!options.hasOwnProperty('session') && asyncLocalStorage?.session != null) {
@@ -932,6 +932,7 @@ Aggregate.prototype.option = function(value) {
  */
 
 Aggregate.prototype.cursor = function(options) {
+  this._optionsForExec();
   this.options.cursor = options || {};
   return new AggregationCursor(this); // return this;
 };
@@ -1040,7 +1041,7 @@ Aggregate.prototype.exec = async function exec() {
   applyGlobalMaxTimeMS(this.options, model.db.options, model.base.options);
   applyGlobalDiskUse(this.options, model.db.options, model.base.options);
 
-  const options = this._optionsForExec()
+  this._optionsForExec();
 
   if (this.options && this.options.cursor) {
     return new AggregationCursor(this);
@@ -1066,6 +1067,8 @@ Aggregate.prototype.exec = async function exec() {
     throw new MongooseError('Aggregate has empty pipeline');
   }
 
+  const options = clone(this.options || {});
+
   let result;
   try {
     const cursor = await collection.aggregate(this._pipeline, options);

lib/cursor/aggregationCursor.js

@@ -44,7 +44,6 @@ function AggregationCursor(agg) {
   const model = agg._model;
   delete agg.options.cursor.useMongooseAggCursor;
   this._mongooseOptions = {};
-  this.options = {};
 
   _init(model, this, agg);
 }
@@ -58,25 +57,21 @@ util.inherits(AggregationCursor, Readable);
 function _init(model, c, agg) {
   if (!model.collection.buffer) {
     model.hooks.execPre('aggregate', agg, function() {
-      Object.assign(c.options, agg._optionsForExec());
-
       if (typeof agg.options?.cursor?.transform === 'function') {
         c._transforms.push(agg.options.cursor.transform);
       }
 
-      c.cursor = model.collection.aggregate(agg._pipeline, c.options || {});
+      c.cursor = model.collection.aggregate(agg._pipeline, agg.options || {});
       c.emit('cursor', c.cursor);
     });
   } else {
     model.collection.emitter.once('queue', function() {
       model.hooks.execPre('aggregate', agg, function() {
-        Object.assign(c.options, agg._optionsForExec());
-
         if (typeof agg.options?.cursor?.transform === 'function') {
           c._transforms.push(agg.options.cursor.transform);
         }
 
-        c.cursor = model.collection.aggregate(agg._pipeline, c.options || {});
+        c.cursor = model.collection.aggregate(agg._pipeline, agg.options || {});
         c.emit('cursor', c.cursor);
       });
     });