add certificate_file

apps/certificate/serializers.py

@@ -3,20 +3,30 @@
 from rest_framework import serializers
 from apps.certificate.models import Certificate
 from apps.course.serializers import CourseDetailSerializer
+from django.conf import settings
 
 
 
 class CertificateSerializer(serializers.ModelSerializer):
     course = serializers.SerializerMethodField()
-    
+    certificate_file = serializers.SerializerMethodField()
+
     class Meta:
         model = Certificate
-        fields = ['id', 'student', 'course', 'status', 'created_at', 'updated_at',]
+        fields = ['id', 'student', 'course', 'status', 'created_at', 'updated_at', 'certificate_file']
         read_only_fields = ['id', 'student', 'status', 'created_at', 'updated_at',]
 
     def get_course(self, obj):
         return CourseDetailSerializer(obj.course, context=self.context).data
 
+    def get_certificate_file(self, obj):
+        if obj.certificate_file:
+            request = self.context.get('request')
+            if request is not None:
+                return request.build_absolute_uri(obj.certificate_file.url)
+            return obj.certificate_file.url
+        return None
+