conditional form: detection of choice works, IFGForm not.

input/forms.py

@@ -31,4 +31,4 @@ class LibraryForm(ModelForm):
 class IFGForm(ModelForm):
     class Meta:
         model = IFG
-        fields = '__all__'
+        exclude = ('realname', 'email', 'username')

input/views.py

@@ -3,7 +3,7 @@ from django.forms import modelformset_factory
 from django.http import HttpResponse
 from formtools.wizard.views import CookieWizardView
 
-from .forms import ProjectForm, VolunteerForm, LibraryForm
+from .forms import ProjectForm, VolunteerForm, LibraryForm, IFGForm
 from .models import Project
 
 def intern(request):
@@ -34,6 +34,13 @@ class ExternView(CookieWizardView):
     template_name = "input/extern.html"
     form_list = [VolunteerForm, LibraryForm]
 
+    def process_step(self, form):
+        if form.cleaned_data.get('choice') == 'IFG':
+            print ('IFG detected!')
+            self.form_list = [VolunteerForm, IFGForm]
+        print('leaving process_step()')
+        return self.get_form_step_data(form)
+
     def done(self, form_list, **kwargs):
         print('ExternView.done() reached')
         # gather data from all forms
@@ -41,9 +48,11 @@ class ExternView(CookieWizardView):
         for form in form_list:
             data = {**data, **form.cleaned_data}
         print(data)
+
         # write data to database
         form = form.save(commit=False)
         # this is ugly code. how can we copy this without explicit writing?
+        # i found no way to access the ModelForm.Meta.exclude-array
         form.realname = data['realname']
         form.username = data['username']
         form.email = data['email']