Merge pull request #203 from dimagi/ce/null-api

use method to set default

commcare_connect/opportunity/api/serializers.py

@@ -26,8 +26,7 @@ class CommCareAppSerializer(serializers.ModelSerializer):
     organization = serializers.SlugRelatedField(read_only=True, slug_field="slug")
     learn_modules = LearnModuleSerializer(many=True)
     install_url = serializers.SerializerMethodField()
-    passing_score = serializers.IntegerField(default=-1)
-    description = serializers.CharField(default="")
+    passing_score = serializers.SerializerMethodField()
 
     class Meta:
         model = CommCareApp
@@ -45,6 +44,11 @@ class Meta:
     def get_install_url(self, obj):
         return f"{settings.COMMCARE_HQ_URL}/a/{obj.cc_domain}/apps/download/{obj.cc_app_id}/media_profile.ccpr"
 
+    def get_passing_score(self, obj):
+        if obj.passing_score is None:
+            return -1
+        return obj.passing_score
+
 
 class OpportunityClaimSerializer(serializers.ModelSerializer):
     class Meta: