apply languages

Main/models/mixins.py

@@ -4,9 +4,14 @@ from SprintLib.utils import get_bytes, write_bytes, delete_file
 
 
 class FileStorageMixin:
+
+    @cached_property
+    def bytes(self):
+        return get_bytes(self.fs_id)
+
     @cached_property
     def text(self):
-        return get_bytes(self.fs_id).decode("utf-8")
+        return self.bytes.decode("utf-8")
 
     def write(self, bytes):
         self.fs_id = write_bytes(bytes)

Main/models/solution.py

@@ -7,6 +7,7 @@ from django.contrib.auth.models import User
 from django.db import models
 from django.utils import timezone
 
+from Main.models import Set
 from Main.models.solution_file import SolutionFile
 from Main.models.task import Task
 from Sprint.settings import CONSTS
@@ -20,11 +21,13 @@ class Solution(models.Model):
     time_sent = models.DateTimeField(default=timezone.now)
     result = models.TextField(default=CONSTS["in_queue_status"])
     test = models.IntegerField(default=None, null=True)
+    set = models.ForeignKey(Set, null=True, on_delete=models.SET_NULL)
 
     class Meta:
         indexes = [
             models.Index(fields=['task', 'user', '-time_sent']),
-            models.Index(fields=['task', '-time_sent'])
+            models.Index(fields=['task', '-time_sent']),
+            models.Index(fields=['set', '-time_sent']),
         ]
 
     @property