"merge" nested items

inventory/admin/item.py

@@ -45,15 +45,30 @@ class ItemModelChangeList(ChangeList):
 @admin.register(ItemModel)
 class ItemModelAdmin(ImportExportMixin, BaseUserAdmin):
     form = ItemModelModelForm
+
+    def column_item(self, obj):
+        qs = ItemModel.objects.filter(user=self.user)
+        qs = qs.filter(parent=obj)
+        context = {
+            'base_item': obj,
+            'sub_items': qs
+        }
+        return render_to_string(
+            template_name='admin/inventory/item/column_item.html',
+            context=context,
+        )
+
+    column_item.short_description = _('ItemModel.verbose_name_plural')
+
     date_hierarchy = 'create_dt'
     list_display = (
         'kind', 'producer',
-        'name',
-        'parent', 'location',
+        'column_item',
+        'location',
         'received_date', 'update_dt'
     )
     ordering = ('kind', 'producer', 'name')
-    list_display_links = ('name',)
+    list_display_links = None
     list_filter = ('kind', 'location', 'producer', 'tags')
     search_fields = ('name', 'description')
     fieldsets = (

inventory/models/item.py

@@ -1,6 +1,7 @@
 import tagulous.models
 from ckeditor_uploader.fields import RichTextUploadingField
 from django.db import models
+from django.urls import reverse
 from django.utils.translation import ugettext_lazy as _
 
 from inventory.models.base import BaseModel
@@ -117,6 +118,14 @@ class ItemModel(BaseModel):
         help_text=_('ItemModel.handed_over_price.help_text')
     )
 
+    def local_admin_link(self):
+        url = reverse('admin:inventory_itemmodel_change', args=[self.id])
+        return url
+
+    def verbose_name(self):
+        parts = [str(part) for part in (self.kind, self.producer, self.name)]
+        return ' - '.join(part for part in parts if part)
+
     def __str__(self):
         if self.parent_id is None:
             title = self.name

inventory/templates/admin/inventory/item/column_item.html

@@ -0,0 +1,8 @@
+<strong><a href="{{ base_item.local_admin_link }}">{{ base_item.name }}</a></strong>
+{% if sub_items %}
+<ul>
+    {% for item in sub_items %}
+        <li><a href="{{ item.local_admin_link }}">{{ item.verbose_name }}</a></li>
+    {% endfor %}
+</ul>
+{% endif %}