```python class LocationMunicipality(models.Model): name = models.TextField(blank=False, primary_key=True) obj = LocationMunicipality(name='Carlow/Mayo') obj.save() ``` Mass admin will raise the following, if we will try to open one particular object, or several objects at once: ```python NoReverseMatch Reverse for 'massadmin_change_view' with keyword arguments '{'app_name': 'location', 'model_name': 'locationmunicipalitydistrict', 'object_ids': 'Carlow/Mayo'}' not found. 1 pattern(s) tried: ['admin/(?P<app_name>[^/]+)/(?P<model_name>[^/]+)\\-masschange/(?P<object_ids>[^/]+)/\\Z'] ``` The problem can be seen here:  Value not quoted as expected by django admin. Django admin use own pk quotation `quote` function from: `django.contrib.admin.utils` Patch coming soon.