fix date options for absence dialog for non-staff users

emissions/forms.py

@@ -307,17 +307,20 @@ class NewsItemForm(forms.ModelForm):
 
 
 class AbsenceDateTimeWidget(forms.Select):
-    def render_options(self, choices, selected_choices):
-        self.choices = []
+    def __init__(self, emission, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.choices = list(self.options(emission))
+
+    def options(self, emission):
         dates = []
         for i in range(4):
             if dates:
                 since = dates[-1] + datetime.timedelta(minutes=10)
             else:
                 since = None
-            dates.append(self.emission.get_next_planned_date(since))
-        choices = [(x, x.strftime('%d/%m/%Y %H:%M')) for x in dates]
-        return super(AbsenceDateTimeWidget, self).render_options(choices, selected_choices)
+            dates.append(emission.get_next_planned_date(since))
+        for date in dates:
+            yield (date, date.strftime('%d/%m/%Y %H:%M'))
 
 
 class AbsenceForm(forms.ModelForm):
@@ -326,7 +329,6 @@ class AbsenceForm(forms.ModelForm):
         exclude = ()
         widgets = {
                 'emission': forms.HiddenInput(),
-                'datetime': AbsenceDateTimeWidget(),
         }
 
     def __init__(self, *args, **kwargs):
@@ -338,6 +340,8 @@ class AbsenceForm(forms.ModelForm):
             date = emission.get_next_planned_date()
             self.fields['datetime'].initial = date
             self.fields['datetime'].widget = DateTimeWidget()
+        else:
+            self.fields['datetime'].widget = AbsenceDateTimeWidget(emission)
 
     def save(self, commit=True):
         t = super(AbsenceForm, self).save(commit=commit)