Add FileType

sqlalchemy_utils/types/file.py

@@ -0,0 +1,29 @@
+from six import binary_type
+
+
+class FileType(TypeDecorator):
+    """
+    FileType for SQLAlchemy
+
+    When the FileType value is being stored into database the FileType saves
+    the filename as unicode in the associated column.
+
+    When the value is fetched from database this type opens the associated
+    file object.
+    """
+    impl = UnicodeText
+
+    def __init__(self, open_func=open, *args, **kwargs):
+        self.open_func = open_func
+        TypeDecorator.__init__(self, *args, **kwargs)
+
+    def process_bind_param(self, value, dialect):
+        if value:
+            if isinstance(value.name, str):
+                return value.name.decode('utf8')
+            else:
+                return value.name
+
+    def process_result_value(self, value, dialect):
+        if value:
+            return self.open_func(value.encode('utf8'))