feat: Adds language dropdown to subevent

pretix_congressschedule/signals.py

@@ -0,0 +1,87 @@
+from django import forms
+from django.utils.translation import gettext_lazy as _
+try:
+	# Available in pretix runtime
+	from pretix.base.models import SubEventMetaValue
+except Exception:  # pragma: no cover - during docs build or without pretix
+	SubEventMetaValue = None
+
+
+class SubEventLanguageForm(forms.Form):
+	language = forms.ChoiceField(
+		label=_("Language"),
+		required=False,
+		help_text=_("Select the language for this tour."),
+		choices=[
+			('deen', _("Bilingual")),
+			('de', _("German")),
+			('en', _("English")),
+		],
+	)
+
+	def __init__(self, *args, **kwargs):
+		self.event = kwargs.pop('event')
+		self.subevent = kwargs.pop('subevent', None)
+		super().__init__(*args, **kwargs)
+		# Pre-fill from subevent meta if available
+		if self.subevent:
+			val = (
+				SubEventMetaValue.objects
+				.filter(subevent=self.subevent, property__name='congressschedule_language')
+				.values_list('value', flat=True)
+				.first()
+			)
+			self.fields['language'].initial = val or ''
+		elif self.subevent and hasattr(self.subevent, 'settings'):
+			# Fallback (older pretix): might be event-wide, keep as last resort
+			self.fields['language'].initial = "deen"
+
+	@property
+	def title(self):
+		return _("Language")
+
+	def save(self):
+		if not self.subevent:
+			return
+		val = (self.cleaned_data.get('language') or '').strip() or 'none'
+		# Persist as real subevent meta value so it's scoped per subevent
+		from pretix.base.models import EventMetaProperty
+
+		property_obj, _ = EventMetaProperty.objects.get_or_create(
+			name='congressschedule_language',
+			defaults={'default': '', 'organizer': self.event.organizer}
+		)
+		SubEventMetaValue.objects.update_or_create(
+			subevent=self.subevent,
+			property=property_obj,
+			defaults={'value': val},
+		)
+
+
+def subevent_forms(sender, request, subevent, **kwargs):
+	# Provide our additional subevent form
+	import logging
+	logger = logging.getLogger(__name__)
+	logger.debug("Providing congressschedule subevent form for event %s, subevent %s", sender.slug, getattr(subevent, 'name', 'no-subevent'))
+	form = SubEventLanguageForm(
+		data=request.POST if request.method == 'POST' else None,
+		event=sender,
+		subevent=subevent,
+		prefix='congressschedule',
+	)
+	return form
+
+
+def connect_signals():
+	# Connect to pretix.control.signals.subevent_forms at import time
+	try:
+		from pretix.control import signals as control_signals
+
+		control_signals.subevent_forms.connect(subevent_forms, dispatch_uid='pretix_congressschedule_subevent_language')
+	except Exception:
+		# Pretix not fully loaded in some contexts (e.g., docs build)
+		pass
+
+
+# Connect immediately when module is imported via AppConfig.ready()
+connect_signals()