django_rbac: replace Operation.name by a registry (#49142)

There is no need to store the operation label in the database.

src/authentic2/a2_rbac/models.py

@@ -422,10 +422,10 @@ GenericRelation(Permission,
                 object_id_field='target_id').contribute_to_class(ContentType, 'admin_perms')
 
 
-CHANGE_PASSWORD_OP = Operation(name=_('Change password'), slug='change_password')
-RESET_PASSWORD_OP = Operation(name=_('Password reset'), slug='reset_password')
-ACTIVATE_OP = Operation(name=_('Activation'), slug='activate')
-CHANGE_EMAIL_OP = Operation(name=pgettext_lazy('operation', 'Change email'), slug='change_email')
-MANAGE_MEMBERS_OP = Operation(name=_('Manage role members'), slug='manage_members')
-MANAGE_AUTHORIZATIONS_OP = Operation(
+CHANGE_PASSWORD_OP = Operation.register(name=_('Change password'), slug='change_password')
+RESET_PASSWORD_OP = Operation.register(name=_('Password reset'), slug='reset_password')
+ACTIVATE_OP = Operation.register(name=_('Activation'), slug='activate')
+CHANGE_EMAIL_OP = Operation.register(name=pgettext_lazy('operation', 'Change email'), slug='change_email')
+MANAGE_MEMBERS_OP = Operation.register(name=_('Manage role members'), slug='manage_members')
+MANAGE_AUTHORIZATIONS_OP = Operation.register(
     name=_('Manage service consents'), slug='manage_authorizations')

src/django_rbac/migrations/0006_remove_operation_name.py

@@ -0,0 +1,17 @@
+# Generated by Django 2.2.17 on 2020-12-04 17:04
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('django_rbac', '0005_auto_20171209_1106'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='operation',
+            name='name',
+        ),
+    ]

src/django_rbac/models.py

@@ -102,9 +102,6 @@ class OrganizationalUnit(OrganizationalUnitAbstractBase):
 
 
 class Operation(models.Model):
-    name = models.CharField(
-        max_length=128,
-        verbose_name=_('name'))
     slug = models.CharField(
         max_length=32,
         verbose_name=_('slug'),
@@ -114,10 +111,20 @@ class Operation(models.Model):
         return [self.slug]
 
     def __str__(self):
-        return six.text_type(_(self.name))
+        return str(self._registry.get(self.slug, self.slug))
 
     def export_json(self):
-        return {'slug': self.slug, 'name': self.name}
+        return {'slug': self.slug}
+
+    @property
+    def name(self):
+        return str(self)
+
+    @classmethod
+    def register(cls, name, slug):
+        cls._registry[slug] = name
+        return cls(slug=slug)
+    _registry = {}
 
     objects = managers.OperationManager()
 
@@ -408,9 +415,9 @@ class PermissionMixin(models.Model):
         return backends.DjangoRBACBackend().ous_with_perm(self, perm, queryset=queryset)
 
 
-ADMIN_OP = Operation(name=_('Management'), slug='admin')
-CHANGE_OP = Operation(name=_('Change'), slug='change')
-DELETE_OP = Operation(name=_('Delete'), slug='delete')
-ADD_OP = Operation(name=_('Add'), slug='add')
-VIEW_OP = Operation(name=_('View'), slug='view')
-SEARCH_OP = Operation(name=_('Search'), slug='search')
+ADMIN_OP = Operation.register(name=_('Management'), slug='admin')
+CHANGE_OP = Operation.register(name=_('Change'), slug='change')
+DELETE_OP = Operation.register(name=_('Delete'), slug='delete')
+ADD_OP = Operation.register(name=_('Add'), slug='add')
+VIEW_OP = Operation.register(name=_('View'), slug='view')
+SEARCH_OP = Operation.register(name=_('Search'), slug='search')

src/django_rbac/utils.py

@@ -78,7 +78,5 @@ def get_permission_model():
 
 def get_operation(operation_tpl):
     from . import models
-    operation, created = models.Operation.objects.get_or_create(
-        slug=six.text_type(operation_tpl.slug),
-        defaults={'name': six.text_type(operation_tpl.name)})
+    operation, created = models.Operation.objects.get_or_create(slug=operation_tpl.slug)
     return operation

tests/test_commands.py

@@ -345,7 +345,7 @@ def test_check_and_repair_managers_of_roles(db, capsys):
 def test_check_and_delete_unused_permissions(db, capsys, simple_user):
     Permission = get_permission_model()
     role1 = get_role_model().objects.create(name='Role1', slug='role1')
-    op1 = Operation.objects.create(name='Operation 1', slug='operation-1')
+    op1 = Operation.objects.create(slug='operation-1')
     used_perm = Permission.objects.create(
         operation=op1, target_id=role1.id,
         target_ct=ContentType.objects.get_for_model(get_role_model()))