feat(agreement): implement user agreement update functionality with validation checks ✨

api/serializers.py

@@ -49,6 +49,15 @@ class UserUpdateSerializer(serializers.ModelSerializer):
         )
 
 
+class UserAgreementSerializer(serializers.ModelSerializer):
+    """serializer for the user agreement object"""
+
+    class Meta:  # type: ignore
+        model = User
+        fields = ("agreement",)
+        extra_kwargs = {"agreement": {"required": True, "allow_null": False}}
+
+
 class CustomUserSerializer(serializers.ModelSerializer):
     """serializer for the user object"""