Improved ChainedForm.

dav_events/forms.py

@@ -76,6 +76,7 @@ class SetPasswordForm(forms.Form):
 
 
 class ChainedForm(forms.Form):
+    _initial_form_name = None
     _next_form_name = None
 
     def __init__(self, *args, **kwargs):
@@ -126,21 +127,33 @@ class ChainedForm(forms.Form):
 
     @property
     def form_title(self):
-        if hasattr(self, '_form_title'):
-            return self._form_title
-        n = self.form_name
-        if n.endswith('Form'):
-            n = n[:-len('Form')]
-        return n
+        return self.__class__.get_form_title()
+
+    @property
+    def initial_form_name(self):
+        return self.__class__.get_initial_form_name()
 
     @property
     def next_form_name(self):
-        return self._next_form_name
+        return self.__class__.get_next_form_name()
 
     @classmethod
     def get_form_name(cls):
         return cls.__name__
 
+    @classmethod
+    def get_form_title(cls):
+        if hasattr(cls, '_form_title'):
+            return cls._form_title
+        n = cls.get_form_name()
+        if n.endswith('Form'):
+            n = n[:-len('Form')]
+        return n
+
+    @classmethod
+    def get_initial_form_name(cls):
+        return cls._initial_form_name or cls.__name__
+
     @classmethod
     def get_next_form_name(cls):
         return cls._next_form_name
@@ -172,6 +185,7 @@ class ChainedForm(forms.Form):
 
 class EventCreateForm(ChainedForm):
     _model = models.Event
+    _initial_form_name = 'ModeForm'
 
 
 class ModeForm(EventCreateForm):

dav_events/views.py

@@ -137,7 +137,7 @@ class EventAcceptView(EventDetailView):
 
 
 class EventCreateView(generic.FormView):
-    initial_form_class = forms.ModeForm
+    form_class = forms.EventCreateForm
     template_dir = os.path.join('dav_events', 'event_create')
     default_template_name = 'default.html'
     abort_url = reverse_lazy('dav_events:home')
@@ -160,7 +160,9 @@ class EventCreateView(generic.FormView):
             if not issubclass(form_class, forms.ChainedForm):
                 raise SuspiciousOperation('Invalid next form: {}'.format(form_name))
         else:
-            form_class = self.initial_form_class
+            base_form_class = self.form_class
+            initial_form_name = base_form_class.get_initial_form_name()
+            form_class = getattr(forms, initial_form_name)
 
         return form_class