feat(videos and podcasts):thumbnail returns from playlist objects

apps/podcast/models.py

@@ -196,6 +196,22 @@ class PodcastPlaylist(LowercaseSlugMixin, models.Model):
         
         return timedelta(seconds=total_seconds)
     
+    @property
+    def effective_thumbnail(self):
+        """
+        Get the thumbnail for this playlist.
+        If playlist has no explicit thumbnail, fall back to the first podcast with a thumbnail.
+        """
+        if self.thumbnail:
+            return self.thumbnail
+        first_item = self.playlist_items.filter(
+            podcast__thumbnail__isnull=False,
+            podcast__status=True
+        ).exclude(podcast__thumbnail='').select_related('podcast').order_by('priority').first()
+        if first_item and first_item.podcast and first_item.podcast.thumbnail:
+            return first_item.podcast.thumbnail
+        return None
+
     def save(self, *args, **kwargs):
         super().save(*args, **kwargs)
     

apps/podcast/serializers.py

@@ -205,7 +205,8 @@ class PodcastPlaylistListSerializer(serializers.ModelSerializer):
         fields = ['id', 'title', 'slug', 'thumbnail', 'slogan', 'view_count', 'total_time_formatted', 'episodes_count', 'order', 'created_at']
 
     def get_thumbnail(self, obj):
-        return get_thumbs(obj.thumbnail, self.context.get('request'))
+        thumb = getattr(obj, 'effective_thumbnail', obj.thumbnail)
+        return get_thumbs(thumb, self.context.get('request'))
 
     def get_total_time_formatted(self, obj):
         return format_duration(obj.total_time)
@@ -231,7 +232,8 @@ class PodcastPlaylistDetailSerializer(serializers.ModelSerializer):
                   'categories', 'created_at', 'user_rate', 'average_rate', 'bookmark', 'podcasts']
 
     def get_thumbnail(self, obj):
-        return get_thumbs(obj.thumbnail, self.context.get('request'))
+        thumb = getattr(obj, 'effective_thumbnail', obj.thumbnail)
+        return get_thumbs(thumb, self.context.get('request'))
     
     def get_total_time_formatted(self, obj):
         return format_duration(obj.total_time)

apps/video/models.py

@@ -269,6 +269,22 @@ class VideoPlaylist(LowercaseSlugMixin, models.Model):
         
         return timedelta(seconds=total_seconds)
     
+    @property
+    def effective_thumbnail(self):
+        """
+        Get the thumbnail for this playlist.
+        If playlist has no explicit thumbnail, fall back to the first video with a thumbnail.
+        """
+        if self.thumbnail:
+            return self.thumbnail
+        first_item = self.playlist_items.filter(
+            video__thumbnail__isnull=False,
+            video__status=True
+        ).exclude(video__thumbnail='').select_related('video').order_by('priority').first()
+        if first_item and first_item.video and first_item.video.thumbnail:
+            return first_item.video.thumbnail
+        return None
+    
     class Meta:
         verbose_name = _('Video Playlist')
         verbose_name_plural = _('Video Playlists')

apps/video/serializers.py

@@ -75,7 +75,8 @@ class VideoPlaylistListSerializer(serializers.ModelSerializer):
         fields = ['id', 'title', 'slug', 'thumbnail', 'slogan', 'view_count', 'video_time', 'total_time_formatted', 'order', 'created_at']
 
     def get_thumbnail(self, obj):
-        return get_thumbs(obj.thumbnail, self.context.get('request'))
+        thumb = getattr(obj, 'effective_thumbnail', obj.thumbnail)
+        return get_thumbs(thumb, self.context.get('request'))
     
     def get_video_time(self, obj):
         return format_duration(obj.total_time)
@@ -104,7 +105,8 @@ class VideoPlaylistDetailSerializer(serializers.ModelSerializer):
                   'categories', 'created_at', 'user_rate', 'average_rate', 'bookmark', 'videos']
 
     def get_thumbnail(self, obj):
-        return get_thumbs(obj.thumbnail, self.context.get('request'))
+        thumb = getattr(obj, 'effective_thumbnail', obj.thumbnail)
+        return get_thumbs(thumb, self.context.get('request'))
     
     def get_video_time(self, obj):
         return format_duration(obj.total_time)