multi-language feature titles

src/c3nav/editor/forms.py

@@ -1,5 +1,9 @@
-from django.forms import ModelForm
+from collections import OrderedDict
+
+from django.conf import settings
+from django.forms import CharField, ModelForm, ValidationError
 from django.forms.widgets import HiddenInput
+from django.utils.translation import ugettext_lazy as _
 
 from ..mapdata.models import Feature
 
@@ -11,6 +15,30 @@ class FeatureForm(ModelForm):
         self.fields['level'].widget = HiddenInput()
         self.fields['geometry'].widget = HiddenInput()
 
+        titles = OrderedDict((lang_code, '') for lang_code, language in settings.LANGUAGES)
+        if self.instance is not None and self.instance.pk:
+            titles.update(self.instance.titles)
+
+        language_titles = dict(settings.LANGUAGES)
+        for language in titles.keys():
+            new_title = self.data.get('title_' + language)
+            if new_title is not None:
+                titles[language] = new_title
+            self.fields['title_' + language] = CharField(label=language_titles.get(language, language), required=False,
+                                                         initial=titles[language].strip(), max_length=50)
+        self.titles = titles
+
+    def clean(self):
+        super().clean()
+        if not any(self.titles.values()):
+            raise ValidationError(
+                _('You have to select a title in at least one language.')
+            )
+
+    def get_languages(self):
+        pass
+
     class Meta:
+        # generate extra fields in the number specified via extra_fields
         model = Feature
         fields = ['name', 'package', 'level', 'geometry']