Complete replacement of Thing types with tag system

boxes/admin.py

@@ -1,7 +1,8 @@
+from django import forms
 from django.contrib import admin
-from django_mptt_admin.admin import DjangoMpttAdmin
+from django.utils.html import format_html
 
-from .models import Box, BoxType, Thing, ThingFile, ThingLink, ThingType
+from .models import Box, BoxType, Facet, Tag, Thing, ThingFile, ThingLink
 
 
 @admin.register(BoxType)
@@ -21,13 +22,6 @@ class BoxAdmin(admin.ModelAdmin):
     search_fields = ('id',)
 
 
-@admin.register(ThingType)
-class ThingTypeAdmin(DjangoMpttAdmin):
-    """Admin configuration for ThingType model."""
-
-    search_fields = ('name',)
-
-
 class ThingFileInline(admin.TabularInline):
     """Inline admin for Thing files."""
 
@@ -47,9 +41,10 @@ class ThingLinkInline(admin.TabularInline):
 class ThingAdmin(admin.ModelAdmin):
     """Admin configuration for Thing model."""
 
-    list_display = ('name', 'thing_type', 'box')
-    list_filter = ('thing_type', 'box')
+    list_display = ('name', 'box')
+    list_filter = ('box', 'tags')
     search_fields = ('name', 'description')
+    filter_horizontal = ('tags',)
     inlines = [ThingFileInline, ThingLinkInline]
 
 
@@ -65,6 +60,53 @@ class ThingFileAdmin(admin.ModelAdmin):
     search_fields = ('title',)
 
 
+class ColorInput(forms.TextInput):
+    """Color picker widget using HTML5 color input."""
+
+    input_type = 'color'
+
+
+class FacetAdminForm(forms.ModelForm):
+    """Form for Facet model with color picker widget."""
+
+    class Meta:
+        model = Facet
+        fields = '__all__'
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['color'].widget = ColorInput(attrs={'type': 'color', 'style': 'height: 50px; width: 100px;'})
+
+
+@admin.register(Facet)
+class FacetAdmin(admin.ModelAdmin):
+    """Admin configuration for Facet model."""
+
+    form = FacetAdminForm
+    list_display = ('name', 'color_preview', 'cardinality')
+    search_fields = ('name',)
+    prepopulated_fields = {'slug': ('name',)}
+    list_filter = ('cardinality',)
+
+    def color_preview(self, obj):
+        return format_html('<span style="color: {}; font-weight: bold;">■ {}</span>', obj.color, obj.color)
+
+
+@admin.register(Tag)
+class TagAdmin(admin.ModelAdmin):
+    """Admin configuration for Tag model."""
+
+    list_display = ('__str__', 'facet_with_color')
+    list_filter = ('facet',)
+    search_fields = ('name', 'facet__name')
+
+    def facet_with_color(self, obj):
+        if obj.facet:
+            return format_html('<span style="color: {}; font-weight: bold;">{}</span>', obj.facet.color, obj.facet.name)
+        return '-'
+    facet_with_color.short_description = 'Facet'
+
+
 @admin.register(ThingLink)
 class ThingLinkAdmin(admin.ModelAdmin):
     """Admin configuration for ThingLink model."""