Create and join teams forms

apps/participation/models.py

@@ -1,6 +1,7 @@
 from django.core.validators import RegexValidator
 from django.db import models
 from django.db.models import Index
+from django.utils.crypto import get_random_string
 from django.utils.translation import gettext_lazy as _
 
 
@@ -14,7 +15,7 @@ class Team(models.Model):
     trigram = models.CharField(
         max_length=3,
         verbose_name=_("trigram"),
-        help_text=_("The trigram must be composed of 3 uppercase letters."),
+        help_text=_("The trigram must be composed of three uppercase letters."),
         unique=True,
         validators=[RegexValidator("[A-Z]{3}")],
     )
@@ -31,6 +32,11 @@ class Team(models.Model):
         default=False,
     )
 
+    def save(self, *args, **kwargs):
+        if not self.access_code:
+            self.access_code = get_random_string(6)
+        return super().save(*args, **kwargs)
+
     def __str__(self):
         return _("Team {name} ({trigram})").format(name=self.name, trigram=self.trigram)