changes display of notes in tables (headers on the side)

corrects code for 'notes' modules according to PEP8 guidelines

notes/mixins.py

@@ -1,34 +1,39 @@
 from django.views.generic.edit import FormMixin
 from django.contrib import messages
 
-from .forms import *
 
 class NoteFormMixin(FormMixin):
+    """ A mixin that allows to easily embed multiple distinct forms on a view.
+        Only one form can be processed by request !
+    """
 
+    # 'forms' shall be a dict of form classes, indexed by a prefix
     forms = None
 
-    def get_form(self, prefix):
-        kwargs = self.get_form_kwargs()
-        kwargs['prefix'] = prefix
+    def get_form_kwargs(self):
+        kwargs = super().get_form_kwargs()
         kwargs['request'] = self.request
-        form_class = self.forms[prefix]
-        return form_class(**kwargs)
+        return kwargs
+
+    def get_form_by_prefix(self, prefix):
+        try:
+            return self.get_form(form_class=self.forms[prefix])
+        except KeyError:
+            raise ValueError("The form with prefix %s is not declared in %s" % (prefix, self.forms))
 
     def post(self, request, **kwargs):
+        """ Save the first valid form found or reload page displaying a warning """
         for prefix in self.forms.keys():
-            form = self.get_form(prefix)
+            form = self.get_form_by_prefix(prefix)
             if form.is_valid():
                 form.save()
+                messages.success(self.request, "Un nouveau %s a été enregistré" % prefix)
                 return self.form_valid(form)
-        return self.form_invalid(form)
-
-    def form_valid(self, form):
-        messages.success(self.request, "Un nouveau %s a été enregistré" % form.prefix)
-        return super().form_valid(form)
+        messages.warning(request, "Il y a eu une erreur lors du traitement du formulaire")
+        return self.get(request, **kwargs)
 
     def get_context_data(self, **kwargs):
         context = super(FormMixin, self).get_context_data(**kwargs)
         for prefix in self.forms.keys():
-            context['%s_form' % prefix] = self.get_form(prefix)
+            context['%s_form' % prefix] = self.get_form_by_prefix(prefix)
         return context
-