.

longs/forms.py

@@ -81,6 +81,17 @@ class LongSeriesForm(ModelForm):
         js = ["jsi18n.js", "tesseract.min.js"]
 
     def __init__(self, *args, **kwargs):
+        self.user = kwargs.pop(
+            "user"
+        )  # To get request.user. Do not use kwargs.pop('user', None) due to potential security hole
+        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["long"] = [t.pk for t in kwargs["instance"].exams.all()]
+
         super(LongSeriesForm, self).__init__(*args, **kwargs)
         # self.fields["examination"] = ModelChoiceField(
         #    queryset=Examination.objects.all(),