fix(query): handle toConstructor() with entries-style sort syntax

Fix #8159

Author: vkarpov15

lib/query.js

@@ -188,7 +188,15 @@ Query.prototype.toConstructor = function toConstructor() {
 
   p.options = {};
 
-  p.setOptions(this.options);
+  // Need to handle `sort()` separately because entries-style `sort()` syntax
+  // `sort([['prop1', 1]])` confuses mquery into losing the outer nested array.
+  // See gh-8159
+  const options = Object.assign({}, this.options);
+  if (options.sort != null) {
+    p.sort(options.sort);
+    delete options.sort;
+  }
+  p.setOptions(options);
 
   p.op = this.op;
   p._conditions = utils.clone(this._conditions);

package.json

@@ -25,7 +25,7 @@
     "mongodb": "3.3.2",
     "mongoose-legacy-pluralize": "1.0.2",
     "mpath": "0.6.0",
-    "mquery": "3.2.1",
+    "mquery": "3.2.2",
     "ms": "2.1.2",
     "regexp-clone": "1.0.0",
     "safe-buffer": "5.1.2",