validate slug properly

src/c3nav/editor/forms.py

@@ -1,6 +1,7 @@
 import json
 import operator
 import os
+from django.core.validators import validate_slug
 from functools import reduce
 from itertools import chain
 
@@ -176,6 +177,7 @@ class EditorFormBase(I18nModelFormMixin, ModelForm):
         self.add_redirect_slugs = None
         self.remove_redirect_slugs = None
         if 'slug' in self.fields:
+            self.fields['slug'].validators.append(validate_slug)
             self.redirect_slugs = sorted(self.instance.redirects.values_list('slug', flat=True))
             self.fields['redirect_slugs'] = CharField(label=_('Redirecting Slugs (comma seperated)'), required=False,
                                                       initial=','.join(self.redirect_slugs))

src/c3nav/mapdata/migrations/0008_validate_slug.py

@@ -0,0 +1,19 @@
+# Generated by Django 2.1.4 on 2018-12-25 22:01
+
+import c3nav.mapdata.models.locations
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mapdata', '0007_location_group_help_text'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='locationslug',
+            name='slug',
+            field=models.SlugField(blank=True, null=True, unique=True, validators=[c3nav.mapdata.models.locations.validate_slug], verbose_name='Slug'),
+        ),
+    ]