init new apps

lettings/admin.py

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+from django.contrib import admin
+
+# Register your models here.

lettings/apps.py

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+from django.apps import AppConfig
+
+
+class LettingsConfig(AppConfig):
+    name = 'lettings'

lettings/migrations/0001_initial.py

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+# Generated by Django 3.0 on 2025-09-04 15:36
+
+import django.core.validators
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Address',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('number', models.PositiveIntegerField(validators=[django.core.validators.MaxValueValidator(9999)])),
+                ('street', models.CharField(max_length=64)),
+                ('city', models.CharField(max_length=64)),
+                ('state', models.CharField(max_length=2, validators=[django.core.validators.MinLengthValidator(2)])),
+                ('zip_code', models.PositiveIntegerField(validators=[django.core.validators.MaxValueValidator(99999)])),
+                ('country_iso_code', models.CharField(max_length=3, validators=[django.core.validators.MinLengthValidator(3)])),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Letting',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('title', models.CharField(max_length=256)),
+                ('address', models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, to='lettings.Address')),
+            ],
+        ),
+    ]

lettings/models.py

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+from django.db import models
+from django.core.validators import MaxValueValidator, MinLengthValidator
+
+
+class Address(models.Model):
+    number = models.PositiveIntegerField(validators=[MaxValueValidator(9999)])
+    street = models.CharField(max_length=64)
+    city = models.CharField(max_length=64)
+    state = models.CharField(max_length=2, validators=[MinLengthValidator(2)])
+    zip_code = models.PositiveIntegerField(validators=[MaxValueValidator(99999)])
+    country_iso_code = models.CharField(max_length=3, validators=[MinLengthValidator(3)])
+
+    def __str__(self):
+        return f'{self.number} {self.street}'
+
+
+class Letting(models.Model):
+    title = models.CharField(max_length=256)
+    address = models.OneToOneField(Address, on_delete=models.CASCADE)
+
+    def __str__(self):
+        return self.title
+

lettings/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

lettings/views.py

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+from django.shortcuts import render
+
+# Create your views here.