Derive more page context from spotify API

website/spotify/client.py

@@ -13,7 +13,7 @@ def is_valid_playlist(playlist_id: str) -> bool:
 def get_playlist(playlist_id: str) -> dict:
     playlist_response = requests.get(
         f"https://{settings.SPOTIFY_PROXY_HOST}/v1/playlists/{playlist_id}",
-        params={"fields": "name,external_urls.spotify,tracks.total"},
+        params={"fields": "name,external_urls.spotify,tracks.total,description"},
     )
     playlist_response.raise_for_status()
     playlist_data = playlist_response.json()
@@ -25,7 +25,7 @@ def get_playlist(playlist_id: str) -> dict:
             params={
                 "offset": str(offset),
                 "limit": str(API_LIMIT),
-                "fields": "items(track(name,album.name,album.images,artists.name,external_urls.spotify,preview_url))",
+                "fields": "items(track(name,album.name,album.images,artists.name,external_urls.spotify,preview_url,duration_ms))",
             },
         )
         tracks_response.raise_for_status()

website/spotify/migrations/0002_remove_spotifyplaylistpage_subtitle.py

@@ -0,0 +1,17 @@
+# Generated by Django 4.0.6 on 2022-08-18 12:51
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("spotify", "0001_initial"),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name="spotifyplaylistpage",
+            name="subtitle",
+        ),
+    ]

website/spotify/models.py

@@ -1,3 +1,4 @@
+from datetime import timedelta
 from functools import cached_property
 
 from django.core.cache import cache
@@ -23,23 +24,38 @@ class SpotifyPlaylistPage(BaseContentPage):
         max_length=32, unique=True, validators=[validate_playlist_id]
     )
 
-    content_panels = BaseContentPage.content_panels + [
-        FieldPanel("spotify_playlist_id")
-    ]
+    content_panels = [
+        panel
+        for panel in BaseContentPage.content_panels
+        if panel.field_name != "subtitle"
+    ] + [FieldPanel("spotify_playlist_id")]
 
     @property
     def table_of_contents(self) -> list:
         return []
 
-    @property
+    @cached_property
     def reading_time(self) -> int:
-        return 0
+        return int(
+            timedelta(
+                milliseconds=sum(
+                    track["track"]["duration_ms"]
+                    for track in self.playlist_data["tracks"]
+                )
+            ).total_seconds()
+            / 60
+        )
+
+    @cached_property
+    def subtitle(self) -> int:
+        return self.playlist_data["description"]
 
     @cached_property
     def playlist_cache_key(self) -> str:
         return f"spotify_playlist_{self.spotify_playlist_id}"
 
-    def get_playlist_data(self) -> dict:
+    @cached_property
+    def playlist_data(self) -> dict:
         playlist_data = cache.get(self.playlist_cache_key)
 
         if playlist_data is None:
@@ -51,5 +67,5 @@ class SpotifyPlaylistPage(BaseContentPage):
 
     def get_context(self, request: HttpRequest) -> dict:
         context = super().get_context(request)
-        context["playlist"] = self.get_playlist_data()
+        context["playlist"] = self.playlist_data
         return context