Allowed column types to be callables. Fixes #1165.

2 files changed, 10 insertions, 5 deletions

diff --git a/lib/sqlalchemy/schema.py b/lib/sqlalchemy/schema.py
index bb97943eb..d859b9061 100644
--- a/lib/sqlalchemy/schema.py
+++ b/lib/sqlalchemy/schema.py
@@ -547,9 +547,13 @@ class Column(SchemaItem, expression._ColumnClause):
                         "May not pass name positionally and as a keyword.")
                 name = args.pop(0)
         if args:
-            if (isinstance(args[0], types.AbstractType) or
-                (isinstance(args[0], type) and
-                 issubclass(args[0], types.AbstractType))):
+            coltype = args[0]
+            if callable(coltype):
+                coltype = args[0]()
+
+            if (isinstance(coltype, types.AbstractType) or
+                (isinstance(coltype, type) and
+                 issubclass(coltype, types.AbstractType))):
                 if type_ is not None:
                     raise exc.ArgumentError(
                         "May not pass type_ positionally and as a keyword.")
diff --git a/lib/sqlalchemy/types.py b/lib/sqlalchemy/types.py
index a7243f279..fe6cc7b53 100644
--- a/lib/sqlalchemy/types.py
+++ b/lib/sqlalchemy/types.py
@@ -246,9 +246,10 @@ class MutableType(object):
 def to_instance(typeobj):
     if typeobj is None:
         return NULLTYPE
-    elif isinstance(typeobj, type):
+
+    try: 
         return typeobj()
-    else:
+    except TypeError:
         return typeobj
 
 def adapt_type(typeobj, colspecs):