Prevent lowercase conversions of spreadsheet export column headers

wagtail/admin/tests/test_reports_views.py

@@ -126,7 +126,7 @@ class TestLockedPagesView(WagtailTestUtils, TestCase):
         self.assertEqual(response.status_code, 200)
         data_lines = response.getvalue().decode().split("\n")
         self.assertEqual(
-            data_lines[0], "Title,Updated,Status,Type,Locked At,Locked By\r"
+            data_lines[0], "Title,Updated,Status,Type,Locked at,Locked by\r"
         )
         if settings.USE_TZ:
             self.assertEqual(
@@ -163,7 +163,7 @@ class TestLockedPagesView(WagtailTestUtils, TestCase):
         cell_array = [[cell.value for cell in row] for row in worksheet.rows]
         self.assertEqual(
             cell_array[0],
-            ["Title", "Updated", "Status", "Type", "Locked At", "Locked By"],
+            ["Title", "Updated", "Status", "Type", "Locked at", "Locked by"],
         )
         self.assertEqual(
             cell_array[1],

wagtail/admin/tests/viewsets/test_model_viewset.py

@@ -506,7 +506,7 @@ class TestListExport(WagtailTestUtils, TestCase):
         )
 
         data_lines = response.getvalue().decode().strip().split("\r\n")
-        self.assertEqual(data_lines[0], "Name,Launch date,Is Cool")
+        self.assertEqual(data_lines[0], "Name,Launch date,Is cool")
         self.assertEqual(data_lines[1], "Catso,2010-06-18,False")
         self.assertEqual(data_lines[2], "LEVEL,2010-06-18,True")
         self.assertEqual(data_lines[3], "Racecar,1995-11-19,None")
@@ -526,7 +526,7 @@ class TestListExport(WagtailTestUtils, TestCase):
         )
 
         data_lines = response.getvalue().decode().strip().split("\r\n")
-        self.assertEqual(data_lines[0], "Name,Launch date,Is Cool")
+        self.assertEqual(data_lines[0], "Name,Launch date,Is cool")
         self.assertEqual(data_lines[1], "Catso,2010-06-18,False")
         self.assertEqual(data_lines[2], "LEVEL,2010-06-18,True")
         self.assertEqual(len(data_lines), 3)
@@ -544,7 +544,7 @@ class TestListExport(WagtailTestUtils, TestCase):
         workbook_data = response.getvalue()
         worksheet = load_workbook(filename=BytesIO(workbook_data)).active
         cell_array = [[cell.value for cell in row] for row in worksheet.rows]
-        self.assertEqual(cell_array[0], ["Name", "Launch date", "Is Cool"])
+        self.assertEqual(cell_array[0], ["Name", "Launch date", "Is cool"])
         self.assertEqual(cell_array[1], ["Catso", datetime.date(2010, 6, 18), "False"])
         self.assertEqual(cell_array[2], ["LEVEL", datetime.date(2010, 6, 18), "True"])
         self.assertEqual(
@@ -568,7 +568,7 @@ class TestListExport(WagtailTestUtils, TestCase):
         workbook_data = response.getvalue()
         worksheet = load_workbook(filename=BytesIO(workbook_data)).active
         cell_array = [[cell.value for cell in row] for row in worksheet.rows]
-        self.assertEqual(cell_array[0], ["Name", "Launch date", "Is Cool"])
+        self.assertEqual(cell_array[0], ["Name", "Launch date", "Is cool"])
         self.assertEqual(cell_array[1], ["Catso", datetime.date(2010, 6, 18), "False"])
         self.assertEqual(cell_array[2], ["LEVEL", datetime.date(2010, 6, 18), "True"])
         self.assertEqual(len(cell_array), 3)

wagtail/admin/views/mixins.py

@@ -10,6 +10,7 @@ from django.utils import timezone
 from django.utils.dateformat import Formatter
 from django.utils.encoding import force_str
 from django.utils.formats import get_format
+from django.utils.text import capfirst
 from openpyxl import Workbook
 from openpyxl.cell import WriteOnlyCell
 
@@ -225,7 +226,7 @@ class SpreadsheetExportMixin:
         if heading_override:
             return force_str(heading_override)
         try:
-            return force_str(label_for_field(field, queryset.model)).title()
+            return capfirst(force_str(label_for_field(field, queryset.model)))
         except (AttributeError, FieldDoesNotExist):
             return force_str(field)
 

wagtail/snippets/tests/test_viewset.py

@@ -774,7 +774,7 @@ class TestListExport(BaseSnippetViewSetTests):
         data_lines = response.getvalue().decode().split("\n")
         self.assertEqual(
             data_lines[0],
-            "Text,Country Code,Custom Foo Column,Some Date,First Published At\r",
+            "Text,Country code,Custom FOO column,Some date,First published at\r",
         )
         self.assertEqual(
             data_lines[1],
@@ -801,10 +801,10 @@ class TestListExport(BaseSnippetViewSetTests):
             cell_array[0],
             [
                 "Text",
-                "Country Code",
-                "Custom Foo Column",
-                "Some Date",
-                "First Published At",
+                "Country code",
+                "Custom FOO column",
+                "Some date",
+                "First published at",
             ],
         )
         self.assertEqual(