Enhance Certificate model and serializer to support file uploads and URL generation

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

@@ -1,12 +1,25 @@
 from rest_framework import serializers
 from core.apps.evaluation.models import CertificateModel
 
+
 class BaseCertificateSerializer(serializers.ModelSerializer):
+    file_url = serializers.SerializerMethodField()
 
     class Meta:
         model = CertificateModel
         fields = [
             "id",
             "title",
-            "file_url"
-        ]
+            "file",
+            "file_url",
+        ]
+
+    def get_file_url(self, obj):
+        request = self.context.get("request")
+
+        if obj.file:
+            if request:
+                return request.build_absolute_uri(obj.file.url)
+            return obj.file.url
+
+        return None