breadcrumbs and page parenting

aircox/admin/page.py

@@ -1,10 +1,13 @@
+import urllib
+
 from django.contrib import admin
+from django.http import QueryDict
 from django.utils.safestring import mark_safe
 from django.utils.translation import gettext_lazy as _
 
 from adminsortable2.admin import SortableInlineAdminMixin
 
-from ..models import Category, Article, NavItem
+from ..models import Category, NavItem, Page
 
 
 __all__ = ['CategoryAdmin', 'PageAdmin', 'NavItemInline']
@@ -27,6 +30,9 @@ class PageAdmin(admin.ModelAdmin):
     list_filter = ('status', 'category')
     prepopulated_fields = {"slug": ("title",)}
 
+    # prepopulate fields using changelist's filters
+    prepopulated_filters = ('parent',)
+
     search_fields = ['title', 'category__title']
     fieldsets = [
         ('', {
@@ -44,6 +50,30 @@ class PageAdmin(admin.ModelAdmin):
         return mark_safe('<img src="{}"/>'.format(obj.cover.icons['64'])) \
             if obj.cover else ''
 
+    def get_changeform_initial_data(self, request):
+        data = super().get_changeform_initial_data(request)
+        filters = QueryDict(request.GET.get('_changelist_filters', ''))
+        data['parent'] = filters.get('parent', None)
+        return data
+
+    def get_common_context(self, query, extra_context=None):
+        extra_context = extra_context or {}
+        parent = query.get('parent', None)
+        if parent is not None:
+            extra_context['parent'] = Page.objects.get(id=parent)
+        return extra_context
+
+    def add_view(self, request, form_url='', extra_context=None):
+        filters = QueryDict(request.GET.get('_changelist_filters', ''))
+        extra_context = self.get_common_context(filters, extra_context)
+        return super().add_view(request, form_url, extra_context)
+
+    # TODO: change_view => parent from object
+
+    def changelist_view(self, request, extra_context=None):
+        extra_context = self.get_common_context(request.GET, extra_context)
+        return super().changelist_view(request, extra_context)
+
 
 class NavItemInline(SortableInlineAdminMixin, admin.TabularInline):
     model = NavItem