registration implemented

Main/models/extrafile.py

@@ -0,0 +1,27 @@
+from os import remove
+from os.path import join, exists
+
+from django.db import models
+
+from Sprint.settings import DATA_ROOT
+
+
+class ExtraFile(models.Model):
+    task = models.ForeignKey('Task', on_delete=models.CASCADE)
+    filename = models.TextField()
+    is_test = models.BooleanField(null=True)
+    readable = models.BooleanField(null=True)
+    test_number = models.IntegerField(null=True)
+
+    @property
+    def path(self):
+        return join(DATA_ROOT, 'extra_files', str(self.id))
+
+    @property
+    def text(self):
+        return open(self.path, 'r').read()
+
+    def delete(self, using=None, keep_parents=False):
+        if exists(self.path):
+            remove(self.path)
+        super().delete(using=using, keep_parents=keep_parents)