Question: Allow limit of string length (#3214)

src/pretix/api/serializers/item.py

@@ -442,7 +442,7 @@ class QuestionSerializer(I18nAwareModelSerializer):
                   'ask_during_checkin', 'identifier', 'dependency_question', 'dependency_values',
                   'hidden', 'dependency_value', 'print_on_invoice', 'help_text', 'valid_number_min',
                   'valid_number_max', 'valid_date_min', 'valid_date_max', 'valid_datetime_min', 'valid_datetime_max',
-                  'valid_file_portrait')
+                  'valid_string_length_max', 'valid_file_portrait')
 
     def validate_identifier(self, value):
         Question._clean_identifier(self.context['event'], value, self.instance)

src/pretix/base/forms/questions.py

@@ -747,12 +747,14 @@ class BaseQuestionsForm(forms.Form):
             elif q.type == Question.TYPE_STRING:
                 field = forms.CharField(
                     label=label, required=required,
+                    max_length=q.valid_string_length_max,
                     help_text=help_text,
                     initial=initial.answer if initial else None,
                 )
             elif q.type == Question.TYPE_TEXT:
                 field = forms.CharField(
                     label=label, required=required,
+                    max_length=q.valid_string_length_max,
                     help_text=help_text,
                     widget=forms.Textarea,
                     initial=initial.answer if initial else None,

src/pretix/base/migrations/0237_question_valid_string_length.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.18 on 2023-04-05 10:03
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0236_reusable_media'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='question',
+            name='valid_string_length_max',
+            field=models.PositiveIntegerField(null=True),
+        ),
+    ]

src/pretix/base/models/items.py

@@ -45,7 +45,9 @@ import dateutil.parser
 import pytz
 from django.conf import settings
 from django.core.exceptions import ValidationError
-from django.core.validators import MinValueValidator, RegexValidator
+from django.core.validators import (
+    MaxLengthValidator, MinValueValidator, RegexValidator,
+)
 from django.db import models
 from django.db.models import Q
 from django.utils import formats
@@ -1540,6 +1542,11 @@ class Question(LoggedModel):
     valid_datetime_max = models.DateTimeField(null=True, blank=True,
                                               verbose_name=_('Maximum value'),
                                               help_text=_('Currently not supported in our apps and during check-in'))
+    valid_string_length_max = models.PositiveIntegerField(null=True, blank=True,
+                                                          verbose_name=_('Maximum length'),
+                                                          help_text=_(
+                                                              'Currently not supported in our apps and during check-in'
+                                                          ))
     valid_file_portrait = models.BooleanField(
         default=False,
         verbose_name=_('Validate file to be a portrait'),
@@ -1686,6 +1693,12 @@ class Question(LoggedModel):
                 return answer
             else:
                 raise ValidationError(_('Unknown country code.'))
+        elif self.type in (Question.TYPE_STRING, Question.TYPE_TEXT):
+            if self.valid_string_length_max is not None and len(answer) > self.valid_string_length_max:
+                raise ValidationError(MaxLengthValidator.message % {
+                    'limit_value': self.valid_string_length_max,
+                    'show_value': len(answer)
+                })
 
         return answer
 

src/pretix/control/forms/item.py

@@ -168,6 +168,7 @@ class QuestionForm(I18nModelForm):
             'valid_date_min',
             'valid_date_max',
             'valid_file_portrait',
+            'valid_string_length_max',
         ]
         widgets = {
             'valid_datetime_min': SplitDateTimePickerWidget(),

src/pretix/control/templates/pretixcontrol/items/question_edit.html

@@ -44,6 +44,9 @@
                     {% bootstrap_field form.valid_datetime_min layout="control" %}
                     {% bootstrap_field form.valid_datetime_max layout="control" %}
                 </div>
+                <div id="valid-string">
+                    {% bootstrap_field form.valid_string_length_max layout="control" %}
+                </div>
                 <div id="valid-file">
                     {% bootstrap_field form.valid_file_portrait layout="control" %}
                 </div>