From f08d912c5cd1cbf832d026a8e6084299583d687a Mon Sep 17 00:00:00 2001
From: Louis Chatriot <louis.chatriot@gmail.com>
Date: Thu, 23 May 2013 19:14:59 +0200
Subject: [PATCH] Implemented  operator

---
 lib/model.js       |  6 ++++++
 test/model.test.js | 13 +++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/lib/model.js b/lib/model.js
index 1d6346c..d8edec1 100644
--- a/lib/model.js
+++ b/lib/model.js
@@ -340,6 +340,12 @@ comparisonFunctions.$in = function (a, b) {
   return false;
 };
 
+comparisonFunctions.$nin = function (a, b) {
+  if (!util.isArray(b)) { throw "$nin operator called with a non-array"; }
+
+  return !comparisonFunctions.$in(a, b);
+};
+
 
 /**
  * Match any of the subqueries
diff --git a/test/model.test.js b/test/model.test.js
index 720a572..6be09b4 100644
--- a/test/model.test.js
+++ b/test/model.test.js
@@ -495,6 +495,19 @@ describe('Model', function () {
         (function () { model.match({ a: 5 }, { a: { $in: 5 } }); }).should.throw();
       });
 
+      it('$nin', function () {
+        model.match({ a: 5 }, { a: { $nin: [6, 8, 9] } }).should.equal(true);
+        model.match({ a: 6 }, { a: { $nin: [6, 8, 9] } }).should.equal(false);
+        model.match({ a: 7 }, { a: { $nin: [6, 8, 9] } }).should.equal(true);
+        model.match({ a: 8 }, { a: { $nin: [6, 8, 9] } }).should.equal(false);
+        model.match({ a: 9 }, { a: { $nin: [6, 8, 9] } }).should.equal(false);
+
+        // Matches if field doesn't exist
+        model.match({ a: 9 }, { b: { $nin: [6, 8, 9] } }).should.equal(true);
+
+        (function () { model.match({ a: 5 }, { a: { $in: 5 } }); }).should.throw();
+      });
+
     });