Fix polymorphism problem with relationships

Since we are using subclasses of the ORM mapped classes, disable
typechecks for ORM relations

lib/mysqlred.py

@@ -249,7 +249,8 @@ class MysqlRedFam( Mysql, Base ):
         __article3_status, __article4_status, __article5_status,
         __article6_status, __article7_status )
 
-    redpage = relationship( "MysqlRedPage", back_populates="redfams" )
+    redpage = relationship( "MysqlRedPage", enable_typechecks=False,
+                            back_populates="redfams" )
 
     @property
     def articlesList(self):
@@ -299,8 +300,9 @@ class MysqlRedPage( Mysql, Base ):
                        nullable=True )
 
     redfams = relationship(
-        "MysqlRedFam", order_by=MysqlRedFam.famhash, back_populates="redpage",
-        collection_class=attribute_mapped_collection("famhash"))
+        "MysqlRedFam", enable_typechecks=False,
+        back_populates="redpage", order_by=MysqlRedFam.famhash,
+        collection_class=attribute_mapped_collection("famhash") )
 
     @property
     def status( self ):

lib/redpage.py

@@ -30,8 +30,7 @@ import mwparserfromhell as mwparser
 
 import jogobot  # noqa
 
-from lib.mysqlred import MysqlRedPage, relationship
-from sqlalchemy.orm.collections import attribute_mapped_collection
+from lib.mysqlred import MysqlRedPage
 from lib.redfam import RedFamParser
 
 
@@ -40,12 +39,6 @@ class RedPage( MysqlRedPage ):
     Class for handling redundance discussion pages and archives
     """
 
-    # TODO POLYMORPHISM? of BASEClass
-    redfams = relationship(
-        "RedFamParser", order_by=RedFamParser.famhash,
-        back_populates="redpage",
-        collection_class=attribute_mapped_collection( "famhash" ) )
-
     def __init__( self, page=None, pageid=None, archive=False ):
         """
         Generate a new RedPage object based on the given pywikibot page object