Change safe-app primary key (#128)

- Add app_id to SafeApp model
- app_id is the new primary key (previous primary key was the url)
- Remove safe-apps fixture – it does not correspond with the new model and the autogenerated primary key

src/safe_apps/migrations/0004_add_auto_pk.py

@@ -0,0 +1,25 @@
+# Generated by Django 3.2.4 on 2021-06-28 14:45
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("safe_apps", "0003_alter_safeapp_provider"),
+    ]
+
+    operations = [
+        # Remove Primary Key constraint from safeapp.url
+        migrations.AlterField(
+            model_name="safeapp",
+            name="url",
+            field=models.URLField(),
+        ),
+        # Add safeapp.app_id as primary key
+        migrations.AddField(
+            model_name="safeapp",
+            name="app_id",
+            field=models.BigAutoField(primary_key=True, serialize=False),
+            preserve_default=False,
+        ),
+    ]

src/safe_apps/models.py

@@ -11,7 +11,8 @@ def __str__(self):
 
 
 class SafeApp(models.Model):
-    url = models.URLField(primary_key=True)
+    app_id = models.BigAutoField(primary_key=True)
+    url = models.URLField()
     name = models.CharField(max_length=200)
     icon_url = models.URLField()
     description = models.CharField(max_length=200)

src/safe_apps/serializers.py

@@ -10,8 +10,17 @@ class Meta:
 
 
 class SafeAppsResponseSerializer(serializers.ModelSerializer):
+    id = serializers.IntegerField(source="app_id")
     provider = ProviderSerializer()
 
     class Meta:
         model = SafeApp
-        fields = ["url", "name", "icon_url", "description", "chain_ids", "provider"]
+        fields = [
+            "id",
+            "url",
+            "name",
+            "icon_url",
+            "description",
+            "chain_ids",
+            "provider",
+        ]

src/safe_apps/tests/factories.py

@@ -16,6 +16,7 @@ class SafeAppFactory(DjangoModelFactory):
     class Meta:
         model = SafeApp
 
+    app_id = factory.Faker("pyint")
     url = factory.Faker("url")
     name = factory.Faker("company")
     icon_url = factory.Faker("image_url")