Improve price information

games/apps.py

@@ -11,6 +11,8 @@ class GamesConfig(AppConfig):
     name = "games"
 
     def ready(self):
+        import games.signals  # noqa: F401
+
         post_migrate.connect(schedule_tasks, sender=self)
 
 
@@ -26,6 +28,14 @@ def schedule_tasks(sender, **kwargs):
             next_run=now() + timedelta(seconds=30),
         )
 
+    if not Schedule.objects.filter(name="Update price per game").exists():
+        schedule(
+            "games.tasks.calculate_price_per_game",
+            name="Update price per game",
+            schedule_type=Schedule.MINUTES,
+            next_run=now() + timedelta(seconds=30),
+        )
+
     from games.models import ExchangeRate
 
     if not ExchangeRate.objects.exists():

games/migrations/0002_purchase_price_per_game.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.1.5 on 2025-01-30 11:04
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('games', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='purchase',
+            name='price_per_game',
+            field=models.FloatField(null=True),
+        ),
+    ]

games/migrations/0003_purchase_updated_at.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.1.5 on 2025-01-30 11:12
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('games', '0002_purchase_price_per_game'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='purchase',
+            name='updated_at',
+            field=models.DateTimeField(auto_now=True),
+        ),
+    ]

games/migrations/0004_purchase_num_purchases.py

@@ -0,0 +1,28 @@
+# Generated by Django 5.1.5 on 2025-01-30 11:57
+
+from django.db import migrations, models
+from django.db.models import Count
+
+
+def initialize_num_purchases(apps, schema_editor):
+    Purchase = apps.get_model("games", "Purchase")
+    purchases = Purchase.objects.annotate(num_games=Count("games"))
+
+    for purchase in purchases:
+        purchase.num_purchases = purchase.num_games
+        purchase.save(update_fields=["num_purchases"])
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("games", "0003_purchase_updated_at"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="purchase",
+            name="num_purchases",
+            field=models.IntegerField(default=0),
+        ),
+        migrations.RunPython(initialize_num_purchases),
+    ]

games/models.py

@@ -116,6 +116,8 @@ class Purchase(models.Model):
     price_currency = models.CharField(max_length=3, default="USD")
     converted_price = models.FloatField(null=True)
     converted_currency = models.CharField(max_length=3, null=True)
+    price_per_game = models.FloatField(null=True)
+    num_purchases = models.IntegerField(default=0)
     ownership_type = models.CharField(
         max_length=2, choices=OWNERSHIP_TYPES, default=DIGITAL
     )
@@ -130,19 +132,16 @@ class Purchase(models.Model):
         related_name="related_purchases",
     )
     created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
 
     @property
     def standardized_price(self):
         return (
-            f"{floatformat(self.converted_price)} {self.converted_currency}"
+            f"{floatformat(self.converted_price, 0)} {self.converted_currency}"
             if self.converted_price
             else None
         )
 
-    @property
-    def num_purchases(self):
-        return self.games.count()
-
     @property
     def has_one_item(self):
         return self.games.count() == 1

games/signals.py

@@ -0,0 +1,12 @@
+from django.db.models.signals import m2m_changed
+from django.dispatch import receiver
+from django.utils.timezone import now
+
+from games.models import Purchase
+
+
+@receiver(m2m_changed, sender=Purchase.games.through)
+def update_num_purchases(sender, instance, **kwargs):
+    instance.num_purchases = instance.games.count()
+    instance.updated_at = now()
+    instance.save(update_fields=["num_purchases"])

games/tasks.py

@@ -1,4 +1,8 @@
 import requests
+from django.db.models import ExpressionWrapper, F, FloatField, Q
+from django.template.defaultfilters import floatformat
+from django.utils.timezone import now
+from django_q.models import Task
 
 from games.models import ExchangeRate, Purchase
 
@@ -51,7 +55,7 @@ def convert_prices():
                         currency_from=currency_from,
                         currency_to=currency_to,
                         year=year,
-                        rate=rate,
+                        rate=floatformat(rate, 2),
                     )
                 else:
                     print("Could not get an exchange rate.")
@@ -61,5 +65,24 @@ def convert_prices():
                 )
         if exchange_rate:
             save_converted_info(
-                purchase, purchase.price * exchange_rate.rate, currency_to
+                purchase,
+                floatformat(purchase.price * exchange_rate.rate, 0),
+                currency_to,
             )
+
+
+def calculate_price_per_game():
+    try:
+        last_task = Task.objects.filter(group="Update price per game").first()
+        last_run = last_task.started
+    except Task.DoesNotExist or AttributeError:
+        last_run = now()
+    purchases = Purchase.objects.filter(converted_price__isnull=False).filter(
+        Q(updated_at__gte=last_run) | Q(price_per_game__isnull=True)
+    )
+    print(f"Updating {purchases.count()} purchases.")
+    purchases.update(
+        price_per_game=ExpressionWrapper(
+            F("converted_price") / F("num_purchases"), output_field=FloatField()
+        )
+    )

games/templates/cotton/price_converted.html

@@ -0,0 +1 @@
+<span title="Price is a result of conversion and rounding." class="decoration-dotted underline">{{ slot }}</span>

games/templates/view_purchase.html

@@ -20,13 +20,12 @@
         </a>
     </div>
     <div>
-        Price:
-        {% if purchase.converted_price %}
-            {{ purchase.converted_price | floatformat }} {{ purchase.converted_currency }}
-        {% else %}
-        None
-        {% endif %}
-         ({{ purchase.price | floatformat }} {{ purchase.price_currency }})
+        <p>
+            Price:
+            <c-price-converted>{{ purchase.standardized_price }}</c-price-converted>
+             ({{ purchase.price | floatformat:2 }} {{ purchase.price_currency }})
+        </p>
+        <p>Price per game: <c-price-converted>{{ purchase.price_per_game | floatformat:0 }} {{ purchase.converted_currency }}</c-price-converted> </p>
     </div>
     <div>
         <h2 class="text-base">Items:</h2>

timetracker/settings.py

@@ -47,7 +47,7 @@ INSTALLED_APPS = [
 
 Q_CLUSTER = {
     "name": "DjangoQ",
-    "workers": 4,
+    "workers": 1,
     "recycle": 500,
     "timeout": 60,
     "retry": 120,