Move discogs_connect to mixin class

discodos/model_collection.py

@@ -15,15 +15,8 @@
 
 log = logging.getLogger('discodos')
 
-
-class Collection (Database):  # pylint: disable=too-many-public-methods
-    """Discogs record collection class."""
-    def __init__(self, db_conn, db_file=False):
-        super().__init__(db_conn, db_file)
-        self.d = False
-        self.me = False
-        self.ONLINE = False # set True by discogs_connect method
-
+class DiscogsConnectMixin:
+    """Discogs connection method."""
     def discogs_connect(self, _userToken, _appIdentifier):
         """Discogs connect try,except wrapper sets attributes d, me and ONLINE.
         """
@@ -37,6 +30,15 @@ def discogs_connect(self, _userToken, _appIdentifier):
             self.ONLINE = False
         return self.ONLINE
 
+
+class Collection (Database, DiscogsConnectMixin):  # pylint: disable=too-many-public-methods
+    """Discogs record collection class."""
+    def __init__(self, db_conn, db_file=False):
+        super().__init__(db_conn, db_file)
+        self.d = False
+        self.me = False
+        self.ONLINE = False # set True by discogs_connect method
+
     def get_all_db_releases(self, orderby='d_artist, discogs_title'):
         # return db.all_releases(self.db_conn)
         return self._select_simple(