import: allow pages with order 0 (#44361)

combo/data/models.py

@@ -186,7 +186,7 @@ class Page(models.Model):
     def save(self, *args, **kwargs):
         if not self.id:
             self.related_cells = {'cell_types': []}
-        if not self.order:
+        if self.order is None:
             max_order = Page.objects.all().aggregate(Max('order')).get('order__max') or 0
             self.order = max_order + 1
         if not self.slug:

tests/test_pages.py

@@ -159,6 +159,7 @@ def test_import_export_pages():
 
     new_page_1 = Page.objects.all().order_by('order')[0]
     new_page_2 = Page.objects.all().order_by('order')[1]
+    assert new_page_1.order < new_page_2.order
     assert new_page_1.title == 'foo'
     assert new_page_2.title == 'bar'
     assert new_page_1.description == "Foo's page"
@@ -358,6 +359,7 @@ def test_import_export_management_commands():
 
     new_page_1 = Page.objects.all().order_by('order')[0]
     new_page_2 = Page.objects.all().order_by('order')[1]
+    assert new_page_1.order < new_page_2.order
     assert new_page_1.title == 'foo'
     assert new_page_2.title == 'bar'
     assert len(CellBase.get_cells(page_id=new_page_1.id)) == 1