rent model: add start_price_index

leasing/migrations/0082_rent_start_price_index.py

@@ -0,0 +1,20 @@
+# Generated by Django 4.2.16 on 2024-11-21 11:54
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("leasing", "0081_rent_old_dwellings_in_housing_companies_price_index"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="rent",
+            name="start_price_index",
+            field=models.DecimalField(
+                decimal_places=1, max_digits=8, null=True, verbose_name="Index number"
+            ),
+        ),
+    ]

leasing/models/rent.py

@@ -310,6 +310,14 @@ class Rent(TimeStampedSafeDeleteModel):
         null=True,
     )
 
+    # In Finnish: Tasotarkistusindeksi vuokran alkaessa
+    start_price_index = models.DecimalField(
+        verbose_name=_("Index number"),
+        decimal_places=1,
+        max_digits=8,
+        null=True,
+    )
+
     recursive_get_related_skip_relations = ["lease"]
 
     class Meta:
@@ -822,6 +830,14 @@ def is_active_on_period(self, date_range_start, date_range_end):
 
         return False
 
+    def set_start_price_index(self):
+        if self.old_dwellings_in_housing_companies_price_index:
+            start_index_number_yearly = IndexNumberYearly.objects.get(
+                index=self.old_dwellings_in_housing_companies_price_index,
+                year=self.start_date.year - 1,
+            )
+            self.start_price_index = start_index_number_yearly.number
+
 
 class RentDueDate(TimeStampedSafeDeleteModel):
     """