fix bug: Using options in aggregates doesn't set anything

Author: spederiva

lib/aggregate.js

@@ -564,7 +564,7 @@ Aggregate.prototype.allowDiskUse = function(value) {
  */
 
 Aggregate.prototype.option = function(value) {
-  for (var key in Object.keys(value)) {
+  for (var key in value) {
     this.options[key] = value[key];
   }
   return this;

package-lock.json

@@ -854,7 +854,7 @@ describe('aggregate: ', function() {
       });
     });
 
-    it('handles aggregation options', function(done) {
+    it('handles aggregation options allowDiskUse', function(done) {
       start.mongodVersion(function(err, version) {
         if (err) {
           throw err;
@@ -867,11 +867,13 @@ describe('aggregate: ', function() {
         var aggregate = m.aggregate(match).read(pref);
         if (mongo26_or_greater) {
           aggregate.allowDiskUse(true);
+          aggregate.option({maxTimeMS: 1000});
         }
 
         assert.equal(aggregate.options.readPreference.mode, pref);
         if (mongo26_or_greater) {
           assert.equal(aggregate.options.allowDiskUse, true);
+          assert.equal(aggregate.options.maxTimeMS, 1000);
         }
 
         aggregate.