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

core/apps/evaluation/models/certificate.py

@@ -1,11 +1,21 @@
 from django.db import models
 from django_core.models import AbstractBaseModel
-from model_bakery import baker
 from django.utils.translation import gettext_lazy as _
+from model_bakery import baker
+
 
 class CertificateModel(AbstractBaseModel):
-    title = models.CharField(verbose_name=_("title"), max_length=255, blank=False, null=False)
-    file_url = models.URLField(verbose_name=_("file url"), max_length=255, blank=False, null=False)
+    title = models.CharField(
+        verbose_name=_("title"),
+        max_length=255
+    )
+
+    file = models.FileField(
+        verbose_name=_("file"),
+        upload_to="certificates/",
+        blank=True,
+        null=True
+    )
 
     def __str__(self):
         return self.title