fix for bytearray being passed to blob column

changelog

@@ -1,5 +1,9 @@
 CHANGELOG
 
+0.18.1
+
+
+
 0.18.0
 
 [260] support for static columns

cqlengine/columns.py

@@ -221,7 +221,7 @@ class Blob(Column):
 
     def to_database(self, value):
 
-        if not isinstance(value, six.binary_type):
+        if not isinstance(value, (six.binary_type, bytearray)):
             raise Exception("expecting a binary, got a %s" % type(value))
 
         val = super(Bytes, self).to_database(value)

cqlengine/tests/columns/test_value_io.py

@@ -85,6 +85,12 @@ class TestBlobIO(BaseColumnIOTest):
     pkey_val = six.b('blake'), uuid4().bytes
     data_val = six.b('eggleston'), uuid4().bytes
 
+class TestBlobIO2(BaseColumnIOTest):
+
+    column = columns.Blob
+    pkey_val = bytearray(six.b('blake')), uuid4().bytes
+    data_val = bytearray(six.b('eggleston')), uuid4().bytes
+
 class TestTextIO(BaseColumnIOTest):
 
     column = columns.Text