rent model: set_start_price_index_point_figure method

leasing/models/rent.py

@@ -834,9 +834,9 @@ def set_start_price_index_point_figure(self):
         if self.old_dwellings_in_housing_companies_price_index:
             start_index_number_yearly = IndexPointFigureYearly.objects.get(
                 index=self.old_dwellings_in_housing_companies_price_index,
-                year=self.start_date.year - 1,
+                year=self.lease.start_date.year - 1,
             )
-            self.start_price_index_point_figure = start_index_number_yearly.point_figure
+            self.start_price_index_point_figure = start_index_number_yearly.value
 
 
 class RentDueDate(TimeStampedSafeDeleteModel):

leasing/tests/conftest.py

@@ -67,7 +67,10 @@
     LandUseAgreementType,
 )
 from leasing.models.receivable_type import ReceivableType
-from leasing.models.rent import OldDwellingsInHousingCompaniesPriceIndex
+from leasing.models.rent import (
+    IndexPointFigureYearly,
+    OldDwellingsInHousingCompaniesPriceIndex,
+)
 from leasing.models.service_unit import ServiceUnitGroupMapping
 from leasing.models.tenant import TenantRentShare
 
@@ -145,6 +148,20 @@ class Meta:
         model = Rent
 
 
+@register
+class OldDwellingsInHousingCompaniesPriceIndexFactory(
+    factory.django.DjangoModelFactory
+):
+    class Meta:
+        model = OldDwellingsInHousingCompaniesPriceIndex
+
+
+@register
+class IndexPointFigureYearlyFactory(factory.django.DjangoModelFactory):
+    class Meta:
+        model = IndexPointFigureYearly
+
+
 @register
 class ContractRentFactory(factory.django.DjangoModelFactory):
     class Meta:

leasing/tests/models/test_rent.py

@@ -12,7 +12,7 @@
     RentCycle,
     RentType,
 )
-from leasing.models import Index, RentAdjustment, RentDueDate
+from leasing.models import Index, Rent, RentAdjustment, RentDueDate
 from leasing.models.utils import DayMonth
 
 
@@ -2841,3 +2841,49 @@ def test_is_the_last_billing_period(
     rent.save()
 
     assert rent.is_the_last_billing_period(billing_period) == expected
+
+
+@pytest.mark.django_db
+def test_set_start_price_index_point_figure_without_index(rent_factory, lease_factory):
+    """The point figure should be None if the rent has no old_dwellings_in_housing_companies_price_index."""
+    lease = lease_factory()
+    rent: Rent = rent_factory(lease=lease)
+
+    rent.set_start_price_index_point_figure()
+
+    assert rent.start_price_index_point_figure is None
+
+
+@pytest.mark.django_db
+def test_set_start_price_index_point_figure_with_last_year_index(
+    rent_factory,
+    lease_factory,
+    old_dwellings_in_housing_companies_price_index_factory,
+    index_point_figure_yearly_factory,
+):
+    """The point figure should be set if rent has old_dwellings_in_housing_companies_price_index
+    and it should be the year previous to the LEASE's start date."""
+    lease = lease_factory(start_date=date(year=2024, month=1, day=1))
+    old_dwellings_in_housing_companies_price_index = (
+        old_dwellings_in_housing_companies_price_index_factory()
+    )
+    index_point_figure_yearly_factory(
+        value=101, year=2021, index=old_dwellings_in_housing_companies_price_index
+    )
+    index_point_figure_yearly_factory(
+        value=102, year=2022, index=old_dwellings_in_housing_companies_price_index
+    )
+    expected_point_figure = index_point_figure_yearly_factory(
+        value=103, year=2023, index=old_dwellings_in_housing_companies_price_index
+    )
+    index_point_figure_yearly_factory(
+        value=104, year=2024, index=old_dwellings_in_housing_companies_price_index
+    )
+    rent: Rent = rent_factory(
+        lease=lease,
+        old_dwellings_in_housing_companies_price_index=old_dwellings_in_housing_companies_price_index,
+    )
+
+    rent.set_start_price_index_point_figure()
+
+    assert rent.start_price_index_point_figure == expected_point_figure.value