form for slot scheduling

symposion/schedule/forms.py

@@ -0,0 +1,24 @@
+from django import forms
+
+from symposion.schedule.models import Slot, Presentation
+
+
+class SlotEditForm(forms.Form):
+    
+    presentation = forms.ModelChoiceField(
+        queryset=Presentation.objects.filter(slot__isnull=True),
+        required=True,
+    )
+    slot_pk = forms.CharField(
+        max_length=10,
+        widget=forms.HiddenInput,
+        required=True,
+    )
+    
+    def clean_slot_pk(self):
+        value = self.cleaned_data["slot_pk"]
+        try:
+            Slot.objects.get(pk=value)
+        except Slot.DoesNotExist:
+            raise forms.ValidationError("Invalid slot.")
+        return value