Fix hardcoded history manager

AUTHORS.rst

@@ -25,6 +25,7 @@ Authors
 - Daniel Gilge
 - Daniel Levy
 - Daniel Roschka
+- Daniil Skrobov (`yetanotherape <https://github.com/yetanotherape>`_)
 - David Grochowski (`ThePumpingLemma <https://github.com/ThePumpingLemma>`_)
 - David Hite
 - Eduardo Cuducos

CHANGES.rst

@@ -2,6 +2,7 @@ Changes
 =======
 
 - remove reference to vendored library ``django.utils.six`` in favor of ``six`` (gh-526)
+- Fixed hardcoded history manager (gh-540)
 
 2.7.0 (2019-01-16)
 ------------------

simple_history/admin.py

@@ -15,6 +15,8 @@
 from django.utils.text import capfirst
 from django.utils.translation import ugettext as _
 
+from . import utils
+
 USER_NATURAL_KEY = tuple(key.lower() for key in settings.AUTH_USER_MODEL.split(".", 1))
 
 SIMPLE_HISTORY_EDIT = getattr(settings, "SIMPLE_HISTORY_EDIT", False)
@@ -130,7 +132,8 @@ def history_form_view(self, request, object_id, version_id, extra_context=None):
             change_history = False
 
         if "_change_history" in request.POST and SIMPLE_HISTORY_EDIT:
-            obj = obj.history.get(pk=version_id).instance
+            history = utils.get_history_manager_for_model(obj)
+            obj = history.get(pk=version_id).instance
 
         formsets = []
         form_class = self.get_form(request, obj)

simple_history/management/commands/clean_duplicate_history.py

@@ -74,7 +74,8 @@ def _process(self, to_process, date_back=None, dry_run=True):
 
     def _process_instance(self, instance, model, stop_date=None, dry_run=True):
         entries_deleted = 0
-        o_qs = instance.history.all()
+        history = utils.get_history_manager_for_model(instance)
+        o_qs = history.all()
         if stop_date:
             # to compare last history match
             extra_one = o_qs.filter(history_date__lte=stop_date).first()

simple_history/tests/tests/test_commands.py

@@ -7,7 +7,14 @@
 
 from simple_history import models as sh_models
 from simple_history.management.commands import populate_history, clean_duplicate_history
-from ..models import Book, Poll, PollWithExcludeFields, Restaurant, Place
+from ..models import (
+    Book,
+    CustomManagerNameModel,
+    Place,
+    Poll,
+    PollWithExcludeFields,
+    Restaurant,
+)
 
 
 @contextmanager
@@ -355,3 +362,22 @@ def test_auto_cleanup_dated_extra_one(self):
         # the "extra_one" (the record before the oldest match)
         # is identical to the oldest match, so oldest match is deleted
         self.assertEqual(Poll.history.all().count(), 5)
+
+    def test_auto_cleanup_custom_history_field(self):
+        m = CustomManagerNameModel.objects.create(name="John")
+        self.assertEqual(CustomManagerNameModel.log.all().count(), 1)
+        m.save()
+        self.assertEqual(CustomManagerNameModel.log.all().count(), 2)
+        m.name = "Ivan"
+        m.save()
+        self.assertEqual(CustomManagerNameModel.log.all().count(), 3)
+        out = StringIO()
+        management.call_command(
+            self.command_name, auto=True, stdout=out, stderr=StringIO()
+        )
+        self.assertEqual(
+            out.getvalue(),
+            "Removed 1 historical records for "
+            "<class 'simple_history.tests.models.CustomManagerNameModel'>\n",
+        )
+        self.assertEqual(CustomManagerNameModel.log.all().count(), 2)

simple_history/utils.py

@@ -14,7 +14,8 @@ def update_change_reason(instance, reason):
                 attrs[field.attname] = value
         else:
             attrs[field.attname] = value
-    record = manager.history.filter(**attrs).order_by("-history_date").first()
+    history = get_history_manager_for_model(manager)
+    record = history.filter(**attrs).order_by("-history_date").first()
     record.history_change_reason = reason
     record.save()