Added countries app with get views (filter view and get by alpha2 view)

solution/pulse/countries/apps.py

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+from django.apps import AppConfig
+
+
+class CountriesConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "countries"

solution/pulse/countries/migrations/0001_initial.py

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+# Generated by Django 4.2.10 on 2024-02-27 18:38
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Country',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=100)),
+                ('alpha2', models.CharField(max_length=2)),
+                ('alpha3', models.CharField(max_length=3)),
+                ('region', models.CharField()),
+            ],
+        ),
+    ]

solution/pulse/countries/models.py

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+from django.db import models
+
+
+class Country(models.Model):
+    name = models.CharField(max_length=100)
+    alpha2 = models.CharField(max_length=2)
+    alpha3 = models.CharField(max_length=3)
+    region = models.CharField()
+
+    def __str__(self):
+        return self.name

solution/pulse/countries/serializers.py

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+from rest_framework import serializers
+
+from countries.models import Country
+
+
+class CountrySerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Country
+        fields = ["name", "alpha2", "alpha3", "region"]

solution/pulse/countries/urls.py

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+from django.urls import path
+
+import countries.views
+
+urlpatterns = [
+    path("", countries.views.CountryListView.as_view(), name="countries"),
+    path(
+        "<str:alpha2>/",
+        countries.views.CountryByAlpha2View.as_view(),
+        name="country_by_alpha2",
+    ),
+]

solution/pulse/countries/views.py

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+from rest_framework.generics import ListAPIView, RetrieveAPIView
+
+from countries.models import Country
+from countries.serializers import CountrySerializer
+
+
+class CountryListView(ListAPIView):
+    queryset = Country.objects.all().order_by("alpha2")
+    filterset_fields = ["region"]
+    serializer_class = CountrySerializer
+
+
+class CountryByAlpha2View(RetrieveAPIView):
+    queryset = Country.objects.all()
+    serializer_class = CountrySerializer
+    lookup_field = "alpha2"