data: fix parent selection on import (#69194)

combo/data/models.py

@@ -573,7 +573,7 @@ class Page(models.Model):
             page, created = Page.objects.get_or_create(slug=json_page['fields']['slug'], snapshot=snapshot)
         json_page['pk'] = page.id
         parent_slug = json_page['fields'].get('parent') or []
-        if parent_slug and not Page.objects.filter(slug=parent_slug[0].split('/')[-1]).exists():
+        if parent_slug and not Page.objects.filter(slug=parent_slug[0].split('/')[-1] or 'index').exists():
             # parent not found, remove it and exclude page from navigation
             json_page['fields'].pop('parent')
             json_page['fields']['exclude_from_navigation'] = True
@@ -636,7 +636,7 @@ class Page(models.Model):
                 # pre-create pages
                 parent = None
                 if json_page['fields'].get('parent'):
-                    parent = json_page['fields']['parent'][0].split('/')[-1]
+                    parent = json_page['fields']['parent'][0].split('/')[-1] or 'index'
 
                 page, created = Page.objects.get_or_create(
                     slug=json_page['fields']['slug'], parent__slug=parent

tests/test_import_export.py

@@ -529,6 +529,23 @@ def test_import_export_linkcell_to_missing_page(app, admin_user):
     assert cell.get_validity_info().invalid_reason_code == 'data_url_not_defined'
 
 
+def test_import_export_linkcell_to_cell_page(app, admin_user):
+    root_page = Page.objects.create(title='Home', slug='index')
+    page = Page.objects.create(title='One', slug='one', parent=root_page)
+    LinkCell.objects.create(page=page, link_page=page, placeholder='content', order=0)
+
+    output = get_output_of_command('export_site')
+    payload = json.loads(output)
+    import_site(data=payload)
+
+    cell = LinkCell.objects.get()
+    assert Page.objects.count() == 2
+    root_page = Page.objects.get(slug='index')
+    page = Page.objects.get(slug='one')
+    assert cell.link_page == page
+    assert page.parent == root_page
+
+
 def test_import_export_linkcell_to_url(app, admin_user):
     page1 = Page.objects.create(title='One', slug='one')
     LinkCell.objects.create(page=page1, url='https://example.com', placeholder='content', order=0)