angri avatar angri committed 6c882e4

added a quirk to make delete subtree tests work on mysql innodb

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     metadata = sqlalchemy.MetaData(engine)
+    # mysql still doesn't support deferring of fk constraints (though it is
+    # required by SQL standard) on deleting. So for mysql we need to make it
+    # cascade delete queries in order to make deleting subtrees work. See
+    #
+    ondelete = DB_URI.startswith('mysql') and 'CASCADE' or 'RESTRICT'
     tbl = sqlalchemy.Table('tbl', metadata,
         sqlalchemy.Column('id', sqlalchemy.Integer, primary_key=True,),
         sqlalchemy.Column('name', sqlalchemy.String(100)),
-        sqlalchemy.Column('parent_id', sqlalchemy.ForeignKey('')),
+        sqlalchemy.Column('parent_id',
+                          sqlalchemy.ForeignKey('', ondelete=ondelete)),
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