diff --git a/src/project/models.py b/src/project/models.py
index fe3b779..ad0acc6 100644
--- a/src/project/models.py
+++ b/src/project/models.py
@@ -27,8 +27,11 @@ class StudentProposal(models.Model):
     project = models.ForeignKey(Project, on_delete=models.CASCADE, help_text='Proposal for the project')
     student = models.ForeignKey(StudentProfile, on_delete=models.CASCADE, help_text='Name of the student proposed')
     drive_link = models.URLField(help_text='Custom drive link for proposal')
-    file = models.FileField(upload_to='proposals', help_text='File link')
+    file = models.FileField(upload_to='proposals', null=True, blank=True, help_text='File link')
     is_accepted = models.BooleanField(default=False, help_text='Accepted/Rejected')
 
+    class Meta:
+        unique_together = (('project', 'student'),)
+
     def __str__(self):
         return self.student.user.get_full_name() + " | " + self.project.name