fix bug

core/apps/evaluation/serializers/certificate/certificate.py

@@ -3,6 +3,7 @@ from core.apps.evaluation.models import CertificateModel
 
 
 class BaseCertificateSerializer(serializers.ModelSerializer):
+    file = serializers.SerializerMethodField()
 
     class Meta:
         model = CertificateModel
@@ -10,4 +11,12 @@ class BaseCertificateSerializer(serializers.ModelSerializer):
             "id",
             "title",
             "file",
-        ]
+        ]
+
+    def get_file(self, obj):
+        if obj.file:
+            request = self.context.get('request')
+            if request:
+                return request.build_absolute_uri(obj.file.url)
+            return obj.file.url
+        return None

core/apps/evaluation/views/certificate.py

@@ -15,7 +15,7 @@ class CertificateView(BaseViewSetMixin, ModelViewSet):
 
     parser_classes = [MultiPartParser, FormParser]
 
-    filter_backends = [SearchFilter]
+    filter_backends = [SearchFilter]    
     search_fields = ["title"]
 
     pagination_class = None