done

Main/models/set.py

@@ -2,6 +2,8 @@ from django.contrib.auth.models import User
 from django.db import models
 from django.utils import timezone
 
+from Main.models.task import Task
+
 
 class Set(models.Model):
     name = models.TextField()
@@ -18,3 +20,7 @@ class Set(models.Model):
             and (self.start_time is None or timezone.now() >= self.start_time)
             and (self.end_time is None or timezone.now() <= self.end_time)
         )
+
+    @property
+    def tasks(self):
+        return Task.objects.filter(settasks__set=self).order_by('settasks__name')

Main/models/settask.py

@@ -5,6 +5,6 @@ from Main.models.set import Set
 
 
 class SetTask(models.Model):
-    set = models.ForeignKey(Set, on_delete=models.CASCADE)
+    set = models.ForeignKey(Set, on_delete=models.CASCADE, related_name="settasks")
     task = models.ForeignKey(Task, on_delete=models.CASCADE, related_name="settasks")
     name = models.CharField(max_length=2)

Main/models/userinfo.py

@@ -1,8 +1,8 @@
 from django.contrib.auth.models import User
 from django.db import models
-from django.db.models import Q
 from django.utils import timezone
 
+from Main.models.set import Set
 from Main.models.group import Group
 from Main.models.settask import SetTask
 from Main.models.subscription import Subscription
@@ -55,6 +55,10 @@ class UserInfo(models.Model):
             self._append_task(task, tasks)
         return sorted(tasks, key=lambda x: x.time_estimation)
 
+    @property
+    def available_sets(self):
+        return Set.objects.all()
+
     @property
     def place(self):
         return len(UserInfo.objects.filter(rating__gt=self.rating)) + 1