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)
+    title = models.CharField(
-    file_url = models.URLField(verbose_name=_("file url"), max_length=255, blank=False, null=False)
+        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

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

core/apps/evaluation/views/certificate.py

@@ -5,6 +5,7 @@ from rest_framework.viewsets import ModelViewSet
 from core.apps.evaluation.models import CertificateModel
 from core.apps.evaluation.serializers.certificate import BaseCertificateSerializer
 from rest_framework.filters import SearchFilter
+from rest_framework.parsers import MultiPartParser, FormParser
 
 @extend_schema(tags=["Certificate"])
 class CertificateView(BaseViewSetMixin, ModelViewSet):
@@ -12,6 +13,8 @@ class CertificateView(BaseViewSetMixin, ModelViewSet):
     serializer_class = BaseCertificateSerializer
     permission_classes = [IsAuthenticated]
 
+    parser_classes = [MultiPartParser, FormParser]
+
     filter_backends = [SearchFilter]
     search_fields = ["title"]