From 8066b145c07984c8b7e56dbb51721c0a3d48e18a Mon Sep 17 00:00:00 2001
From: Valeri Karpov <valkar207@gmail.com>
Date: Fri, 15 Jan 2016 14:15:03 -0500
Subject: [PATCH] fix(types): smarter casting for buffer with number (Fix
 #3764)

---
 lib/schema/buffer.js      | 3 +++
 test/types.buffer.test.js | 9 +++++++++
 2 files changed, 12 insertions(+)

diff --git a/lib/schema/buffer.js b/lib/schema/buffer.js
index d26cc339b7c..b64234fce89 100644
--- a/lib/schema/buffer.js
+++ b/lib/schema/buffer.js
@@ -125,6 +125,9 @@ SchemaBuffer.prototype.cast = function(value, doc, init) {
 
   var type = typeof value;
   if ('string' == type || 'number' == type || Array.isArray(value)) {
+    if (type === 'number') {
+      value = [value];
+    }
     ret = new MongooseBuffer(value, [this.path, doc]);
     return ret;
   }
diff --git a/test/types.buffer.test.js b/test/types.buffer.test.js
index 74af5701885..b7081c387d3 100644
--- a/test/types.buffer.test.js
+++ b/test/types.buffer.test.js
@@ -450,5 +450,14 @@ describe('types.buffer', function() {
         });
       });
     });
+
+    it('cast from number (gh-3764)', function(done) {
+      var schema = new Schema({ buf: Buffer });
+      var MyModel = mongoose.model('gh3764', schema);
+
+      var doc = new MyModel({ buf: 9001 });
+      assert.equal(doc.buf.length, 1);
+      done();
+    });
   });
 });