fix https://github.com/django/django-formtools/issues/16

docs/wizard.rst

@@ -376,6 +376,16 @@ Advanced ``WizardView`` methods
         def get_form_kwargs(self, step):
             return {}
 
+.. method:: WizardView.get_form_class(step)
+
+    Returns the form class which will be used when instantiating the form
+    instance on given ``step``.
+
+    The default implementation::
+
+        def get_form_class(self, step):
+            return self.form_list[step]
+
 .. method:: WizardView.get_form_instance(step)
 
     This method will be called only if a :class:`~django.forms.ModelForm` is

formtools/wizard/views.py

@@ -216,7 +216,7 @@ def get_form_list(self):
                 # call the value if needed, passes the current instance.
                 condition = condition(self)
             if condition:
-                form_list[form_key] = form_class
+                form_list[form_key] = self.get_form_class(form_key)
         return form_list
 
     def dispatch(self, request, *args, **kwargs):
@@ -394,6 +394,12 @@ def get_form_kwargs(self, step=None):
         """
         return {}
 
+    def get_form_class(self, step):
+        """
+        Returns the form class to use for the provided step.
+        """
+        return self.form_list[step]
+
     def get_form(self, step=None, data=None, files=None):
         """
         Constructs the form for a given `step`. If no `step` is defined, the
@@ -405,7 +411,7 @@ def get_form(self, step=None, data=None, files=None):
         """
         if step is None:
             step = self.steps.current
-        form_class = self.form_list[step]
+        form_class = self.get_form_class(step)
         # prepare the kwargs for the form instance.
         kwargs = self.get_form_kwargs(step)
         kwargs.update({