- fix missing argument in TypeDecorator.copy(), fixes #3584, references #2919

2 files changed, 17 insertions, 3 deletions

diff --git a/lib/sqlalchemy/sql/type_api.py b/lib/sqlalchemy/sql/type_api.py
index bc67270eb..c367bc73e 100644
--- a/lib/sqlalchemy/sql/type_api.py
+++ b/lib/sqlalchemy/sql/type_api.py
@@ -675,7 +675,7 @@ class TypeDecorator(SchemaEventTarget, TypeEngine):
           def process_result_value(self, value, dialect):
               return value[7:]
 
-          def copy(self):
+          def copy(self, **kw):
               return MyType(self.impl.length)
 
     The class-level "impl" attribute is required, and can reference any
@@ -1136,7 +1136,7 @@ class TypeDecorator(SchemaEventTarget, TypeEngine):
         """
         return self
 
-    def copy(self):
+    def copy(self, **kw):
         """Produce a copy of this :class:`.TypeDecorator` instance.
 
         This is a shallow copy and is provided to fulfill part of
diff --git a/test/sql/test_metadata.py b/test/sql/test_metadata.py
index 501df4671..d4039a5fe 100644
--- a/test/sql/test_metadata.py
+++ b/test/sql/test_metadata.py
@@ -7,7 +7,7 @@ from sqlalchemy import Integer, String, UniqueConstraint, \
     CheckConstraint, ForeignKey, MetaData, Sequence, \
     ForeignKeyConstraint, PrimaryKeyConstraint, ColumnDefault, Index, event,\
     events, Unicode, types as sqltypes, bindparam, \
-    Table, Column, Boolean, Enum, func, text
+    Table, Column, Boolean, Enum, func, text, TypeDecorator
 from sqlalchemy import schema, exc
 from sqlalchemy.sql import elements, naming
 import sqlalchemy as tsa
@@ -1547,6 +1547,20 @@ class SchemaTypeTest(fixtures.TestBase):
         # our test type sets table, though
         is_(t2.c.y.type.table, t2)
 
+    def test_tometadata_copy_decorated(self):
+
+        class MyDecorated(TypeDecorator):
+            impl = self.MyType
+
+        m1 = MetaData()
+
+        type_ = MyDecorated(schema="z")
+        t1 = Table('x', m1, Column("y", type_))
+
+        m2 = MetaData()
+        t2 = t1.tometadata(m2)
+        eq_(t2.c.y.type.schema, "z")
+
     def test_tometadata_independent_schema(self):
         m1 = MetaData()