fix: import error

Author: NimVrod

papers/models.py

@@ -3,11 +3,20 @@
 import textwrap
 
 from django.contrib.auth.models import User
+from django.core.exceptions import ValidationError
 from django.db import models
 from django.db.models.signals import pre_delete
 from django.utils import timezone
 from django.core.validators import MinValueValidator, MaxValueValidator
 
+MAX_FILE_SIZE = 50 * 1024 * 1024  # 50 MB
+
+
+def validate_file_size(value):
+    """Validate whether the uploaded file size is within the allowed limit (MAX_FILE_SIZE)."""
+    if value.size > MAX_FILE_SIZE:
+        raise ValidationError(f'Maximum file size is {MAX_FILE_SIZE / (1024 * 1024)} MB.')
+
 class NotificationPeriod(models.Model):
     name = models.CharField(max_length=64)
     period = models.IntegerField()  # in seconds
@@ -93,7 +102,7 @@ def paper_directory_path(instance, filename):
 
 class UploadedFile(models.Model):
     paper = models.ForeignKey(Paper, on_delete=models.CASCADE)
-    file = models.FileField(upload_to=paper_directory_path, blank=True,max_length=512)
+    file = models.FileField(upload_to=paper_directory_path, blank=True, max_length=512, validators=[validate_file_size])
     created_at = models.DateTimeField(default=timezone.now)
 
     def filename(self):