[GitHub] [airflow] ashb commented on a change in pull request #13278: fix dag run type enum query for mysqldb driver

[GitBox <gi...@apache.org>]

ashb commented on a change in pull request #13278:
URL: https://github.com/apache/airflow/pull/13278#discussion_r547840374



##########
File path: airflow/utils/types.py
##########
@@ -16,8 +16,31 @@
 # under the License.
 import enum
 
+from sqlalchemy.types import TypeDecorator, String
 
-class DagRunType(str, enum.Enum):
+
+class EnumString(TypeDecorator):
+    """
+    Declare db column with this type to make the column compatible with string
+    and string based enum values when building the sqlalchemy ORM query. It can
+    be used just like sqlalchemy.types.String, for example:
+
+    ```
+    class Table(Base):
+        __tablename__ = "t"
+        run_type = Column(EnumString(50), nullable=False)
+    ```
+    """
+    impl = String
+
+    def process_bind_param(self, value, dialect):
+        if isinstance(value, enum.Enum):
+            return value.value
+        else:
+            return value
+
+
+class DagRunType(enum.Enum):

Review comment:
       Not a fan of this - these enums are used elsewhere than just db.
   
   Can you explain when this is a problem? Cos it worked for me in mysql




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