$not as grouping comparator

lib/dialects/abstract/query-generator.js

@@ -1567,6 +1567,7 @@ module.exports = (function() {
 
 
       var self = this
       var self = this
         , binding
         , binding
+        , outerBinding
         , comparatorMap
         , comparatorMap
         , aliasMap
         , aliasMap
         , comparator = '='
         , comparator = '='
@@ -1652,9 +1653,14 @@ module.exports = (function() {
         }
         }
       }
       }
 
 
-      // OR/AND grouping logic
-      if (key === '$or' || key === '$and') {
-        binding = key === '$or' ? ' OR ' : ' AND ';
+      // OR/AND/NOT grouping logic
+      if (key === '$or' || key === '$and' || key === '$not') {
+        
+        binding = (key === '$or') ?' OR ' : ' AND ';
+        
+        outerBinding = '';
+        if (key === '$not') outerBinding = 'NOT ';
+
 
 
         if (Array.isArray(value)) {
         if (Array.isArray(value)) {
           value = value.map(function (item) {
           value = value.map(function (item) {
@@ -1667,10 +1673,10 @@ module.exports = (function() {
             return item && item.length;
             return item && item.length;
           });
           });
 
 
-          return value.length ? '('+value.join(binding)+')' : undefined;
+          return value.length ? outerBinding + '('+value.join(binding)+')' : undefined;
         } else {
         } else {
           value = self.whereItemsQuery(value, options, binding);
           value = self.whereItemsQuery(value, options, binding);
-          return value ? '('+value+')' : undefined;
+          return value ? outerBinding + '('+value+')' : undefined;
         }
         }
       }
       }
 
 

test/unit/sql/where.test.js

@@ -159,7 +159,7 @@ suite(Support.getTestDialectTeaser('SQL'), function() {
       });
       });
     });
     });
 
 
-    suite('$and/$or', function () {
+    suite('$and/$or/$not', function () {
       suite('$or', function () {
       suite('$or', function () {
         testsql('email', {
         testsql('email', {
           $or: ['maker@mhansen.io', 'janzeh@gmail.com']
           $or: ['maker@mhansen.io', 'janzeh@gmail.com']
@@ -231,6 +231,18 @@ suite(Support.getTestDialectTeaser('SQL'), function() {
           });
           });
         });
         });
       });
       });
+
+      suite('$not', function () {
+        testsql('$not', {
+          shared: 1,
+          $or: {
+            group_id: 1,
+            user_id: 2
+          }
+        }, {
+          default: "NOT ([shared] = 1 AND ([group_id] = 1 OR [user_id] = 2))"
+        });
+      });
     });
     });
 
 
     suite('$gt', function () {
     suite('$gt', function () {