Item update: restrict choices

src/tixlbase/admin.py

@@ -5,7 +5,7 @@ from django import forms
 
 from tixlbase.models import (
     User, Organizer, OrganizerPermission, Event, EventPermission,
-    Property, PropertyValue, Item, ItemVariation
+    Property, PropertyValue, Item, ItemVariation, ItemCategory
 )
 
 
@@ -105,6 +105,13 @@ class PropertyAdmin(admin.ModelAdmin):
     search_fields = ('name', 'event')
 
 
+class ItemCategoryAdmin(admin.ModelAdmin):
+
+    model = ItemCategory
+    list_display = ('name', 'event')
+    search_fields = ('name', 'event')
+
+
 class ItemVariationInline(admin.TabularInline):
 
     model = ItemVariation
@@ -124,3 +131,4 @@ admin.site.register(Organizer, OrganizerAdmin)
 admin.site.register(Event, EventAdmin)
 admin.site.register(Property, PropertyAdmin)
 admin.site.register(Item, ItemAdmin)
+admin.site.register(ItemCategory, ItemCategoryAdmin)

src/tixlbase/models.py

@@ -332,8 +332,11 @@ class ItemCategory(models.Model):
     """
     Items can be sorted into categories
     """
-    event = models.ForeignKey(Event,
+    event = models.ForeignKey(
-                              on_delete=models.CASCADE)
+        Event,
+        on_delete=models.CASCADE,
+        related_name='categories',
+    )
     name = models.CharField(
         max_length=255,
         verbose_name=_("Category name"),
@@ -358,7 +361,10 @@ class Property(models.Model):
     with the item 'T-Shirt'.
     """
 
-    event = models.ForeignKey(Event)
+    event = models.ForeignKey(
+        Event,
+        related_name="properties",
+    )
     name = models.CharField(
         max_length=250,
         verbose_name=_("Property name"),

src/tixlcontrol/views/item.py

@@ -42,6 +42,11 @@ class PropertyList(ListView):
 
 class ItemUpdateFormGeneral(forms.ModelForm):
 
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['category'].queryset = self.instance.event.categories.all()
+        self.fields['properties'].queryset = self.instance.event.properties.all()
+
     class Meta:
         model = Item
         localized_fields = '__all__'