"Show Count" on ThingAdmin fixed

boxes/admin.py

@@ -1,10 +1,43 @@
 from django import forms
 from django.contrib import admin
+from django.contrib.admin import SimpleListFilter
 from django.utils.html import format_html
 
 from .models import Box, BoxType, Facet, Tag, Thing, ThingFile, ThingLink
 
 
+class BoxFilter(SimpleListFilter):
+    """Custom filter for boxes using pk to avoid spaces in aliases."""
+
+    title = 'box'
+    parameter_name = 'box__pk'
+
+    def lookups(self, request, model_admin):
+        boxes = Box.objects.select_related('box_type').order_by('id')
+        return [(box.pk, str(box)) for box in boxes]
+
+    def queryset(self, request, queryset):
+        if self.value():
+            return queryset.filter(box__pk=self.value())
+        return queryset
+
+
+class TagsFilter(SimpleListFilter):
+    """Custom filter for tags using pk to avoid spaces in aliases."""
+
+    title = 'tags'
+    parameter_name = 'tags__pk'
+
+    def lookups(self, request, model_admin):
+        tags = Tag.objects.select_related('facet').order_by('facet__name', 'name')
+        return [(tag.pk, str(tag)) for tag in tags]
+
+    def queryset(self, request, queryset):
+        if self.value():
+            return queryset.filter(tags__pk=self.value())
+        return queryset
+
+
 @admin.register(BoxType)
 class BoxTypeAdmin(admin.ModelAdmin):
     """Admin configuration for BoxType model."""
@@ -42,7 +75,7 @@ class ThingAdmin(admin.ModelAdmin):
     """Admin configuration for Thing model."""
 
     list_display = ('name', 'box')
-    list_filter = ('box', 'tags')
+    list_filter = (BoxFilter, TagsFilter)
     search_fields = ('name', 'description')
     filter_horizontal = ('tags',)
     inlines = [ThingFileInline, ThingLinkInline]