Add forbidden trigrams, closes #17

apps/participation/migrations/0003_alter_team_trigram.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.18 on 2023-02-19 22:13
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('participation', '0002_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='team',
+            name='trigram',
+            field=models.CharField(help_text='The trigram must be composed of three uppercase letters.', max_length=3, unique=True, validators=[django.core.validators.RegexValidator('^[A-Z]{3}$'), django.core.validators.RegexValidator('^(?!BIT$|CNO$|CRO$|CUL$|FTG$|FCK$|FUC$|FUK$|FYS$|HIV$|IST$|MST$|KKK$|KYS$|SEX$)', message='This trigram is forbidden.')], verbose_name='trigram'),
+        ),
+    ]

apps/participation/models.py

@@ -39,7 +39,11 @@ class Team(models.Model):
         verbose_name=_("trigram"),
         help_text=_("The trigram must be composed of three uppercase letters."),
         unique=True,
-        validators=[RegexValidator("[A-Z]{3}")],
+        validators=[
+            RegexValidator(r"^[A-Z]{3}$"),
+            RegexValidator(fr"^(?!{'|'.join(f'{t}$' for t in settings.FORBIDDEN_TRIGRAMS)})",
+                           message=_("This trigram is forbidden.")),
+        ],
     )
 
     access_code = models.CharField(