Move the relational key builder into PlexObject and remove the parent-child mixin.

Author: Touchstone64

plexapi/base.py

@@ -176,6 +176,26 @@ def _buildDetailsKey(self, **kwargs):
             details_key += '?' + urlencode(sorted(params.items()))
         return details_key
 
+    def _buildRelationalKey(self, key, **kwargs):
+        """ Returns a key suitable for fetching partial objects extended to
+            include relational information.
+
+            Parameters:
+                key (str): The relational key to be fetched.
+                **kwargs (dict): Optional query parameters to add to the key, such as
+                    'excludeAllLeaves=1' or 'index=0'. Additional XML filters should instead
+                    be passed into search functions. See :func:`~plexapi.base.PlexObject.fetchItems`
+                    for details.
+
+        """
+        if not key:
+            return None
+
+        args = {'includeGuids': 1, **kwargs}
+        params = utils.joinArgs(args)
+
+        return f"{key}{params}"
+
     def _isChildOf(self, **kwargs):
         """ Returns True if this object is a child of the given attributes.
             This will search the parent objects all the way to the top.

plexapi/mixins/__init__.py

@@ -29,7 +29,6 @@
 from .split_merge import SplitMergeMixin
 from .unmatch_match import UnmatchMatchMixin
 from .watchlist import WatchlistMixin
-from .tv_parent_child import TvParentChildMixin
 
 
 class MovieEditMixins(
@@ -141,26 +140,23 @@ class ShowMixins(
     AdvancedSettingsMixin, SplitMergeMixin, UnmatchMatchMixin, ExtrasMixin, HubsMixin, RatingMixin,
     ArtMixin, LogoMixin, PosterMixin, SquareArtMixin, ThemeMixin,
     ShowEditMixins,
-    WatchlistMixin,
-    TvParentChildMixin
+    WatchlistMixin
 ):
     pass
 
 
 class SeasonMixins(
     AdvancedSettingsMixin, ExtrasMixin, RatingMixin,
     ArtMixin, LogoMixin, PosterMixin, SquareArtMixin, ThemeUrlMixin,
-    SeasonEditMixins,
-    TvParentChildMixin
+    SeasonEditMixins
 ):
     pass
 
 
 class EpisodeMixins(
     ExtrasMixin, RatingMixin,
     ArtMixin, LogoMixin, PosterMixin, SquareArtMixin, ThemeUrlMixin,
-    EpisodeEditMixins,
-    TvParentChildMixin
+    EpisodeEditMixins
 ):
     pass
 
@@ -266,5 +262,5 @@ class PlaylistMixins(
     # Composite Mixins
     'AlbumMixins', 'ArtistMixins', 'ClipMixins', 'CollectionMixins', 'EpisodeMixins',
     'MovieMixins', 'PhotoMixins', 'PhotoalbumMixins', 'PlaylistMixins',
-    'SeasonMixins', 'ShowMixins', 'TrackMixins', 'TvParentChildMixin'
+    'SeasonMixins', 'ShowMixins', 'TrackMixins'
 ]