.

generic/forms.py

@@ -93,6 +93,14 @@ class QuestionNoteForm(ModelForm):
 class CidUserForm(ModelForm):
 
     def __init__(self, *args, **kwargs):
+        if kwargs.get("instance"):
+            # We get the 'initial' keyword argument or initialize it
+            # as a dict if it didn't exist.
+            initial = kwargs.setdefault("initial", {})
+            # The widget for a ModelMultipleChoiceField expects
+            # a list of primary key for the selected data.
+            initial["physics_exams"] = [t.pk for t in kwargs["instance"].physics_exams.all()]
+
         ModelForm.__init__(self, *args, **kwargs)
 
         super(CidUserForm, self).__init__(*args, **kwargs)