solution

car/migrations/0001_initial.py

@@ -0,0 +1,26 @@
+# Generated by Django 4.1 on 2026-03-10 14:15
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Car',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('manufacturer', models.CharField(max_length=64)),
+                ('model', models.CharField(max_length=64)),
+                ('horse_powers', models.PositiveSmallIntegerField(validators=[django.core.validators.MaxValueValidator(1914), django.core.validators.MinValueValidator(1)])),
+                ('is_broken', models.BooleanField()),
+                ('problem_description', models.TextField(blank=True, null=True)),
+            ],
+        ),
+    ]

car/serializers.py

@@ -1,5 +1,46 @@
 from rest_framework import serializers
 
+from car.models import Car
+
 
 class CarSerializer(serializers.Serializer):
-    pass
+    id = serializers.IntegerField(read_only=True)
+    manufacturer = serializers.CharField(max_length=64)
+    model = serializers.CharField(max_length=64)
+    horse_powers = serializers.IntegerField()
+    is_broken = serializers.BooleanField()
+    problem_description = serializers.CharField(
+        allow_null=True,
+        required=False
+    )
+
+    def validate_horse_powers(self, value):
+        if value > 1914 or value < 1:
+            raise serializers.ValidationError(
+                "Horse Power must be between 1 and 1914!"
+            )
+        return value
+
+    def create(self, validated_data):
+        return Car.objects.create(**validated_data)
+
+    def update(self, instance, validated_data):
+        instance.manufacturer = validated_data.get(
+            "manufacturer",
+            instance.manufacturer
+        )
+        instance.model = validated_data.get("model", instance.model)
+        instance.horse_powers = validated_data.get(
+            "horse_powers",
+            instance.horse_powers
+        )
+        instance.is_broken = validated_data.get(
+            "is_broken",
+            instance.is_broken
+        )
+        instance.problem_description = validated_data.get(
+            "problem_description",
+            instance.problem_description
+        )
+        instance.save()
+        return instance

main.py

@@ -1,9 +1,18 @@
 from car.models import Car
+from car.serializers import CarSerializer
+
+import json as js
 
 
 def serialize_car_object(car: Car) -> bytes:
-    pass
+    serializer = CarSerializer(instance=car)
+    return js.dumps(serializer.data, separators=(
+        ",", ":")).encode("utf-8",)
 
 
 def deserialize_car_object(json: bytes) -> Car:
-    pass
+    json_str = json.decode("utf-8")
+    data = js.loads(json_str)
+    serializer = CarSerializer(data=data)
+    serializer.is_valid(raise_exception=True)
+    return Car.objects.create(**serializer.validated_data)