Set history_user automatically using middleware

.travis.yml

@@ -7,10 +7,9 @@ python:
   - 3.3
 
 env:
-  - DJANGO=Django==1.3.7
-  - DJANGO=Django==1.4.10
-  - DJANGO=Django==1.5.5
-  - DJANGO=Django==1.6.2
+  - DJANGO=Django==1.4.13
+  - DJANGO=Django==1.5.8
+  - DJANGO=Django==1.6.5
   - DJANGO=https://github.com/django/django/tarball/stable/1.7.x
 
 install:
@@ -21,16 +20,16 @@ script: coverage run -a setup.py test
 matrix:
   exclude:
    - python: 2.6
-     env: DJANGO=Django==1.6.2
+     env: DJANGO=Django==1.6.5
    - python: 2.6
      env: DJANGO=https://github.com/django/django/tarball/stable/1.7.x
    - python: 3.2
-     env: DJANGO=Django==1.3.7
+     env: DJANGO=Django==1.4.13
    - python: 3.3
-     env: DJANGO=Django==1.3.7
-   - python: 3.2
-     env: DJANGO=Django==1.4.10
-   - python: 3.3
-     env: DJANGO=Django==1.4.10
+     env: DJANGO=Django==1.4.13
+
+  include:
+   - python: 3.4
+     env: DJANGO=https://github.com/django/django/tarball/stable/1.7.x
 
 after_success: coveralls

docs/usage.rst

@@ -46,6 +46,21 @@ Django tutorial:
 Now all changes to ``Poll`` and ``Choice`` model instances will be tracked in
 the database.
 
+The historical models can also track who made each change. To populate
+the history user automatically you can add middleware to your Django
+settings:
+
+.. code-block:: python
+
+    MIDDLEWARE_CLASSES = [
+        # ...
+        'simple_history.middleware.HistoryRequestMiddleware',
+    ]
+
+If you do not want to use the middleware, you can explicitly indicate
+the user making the change as indicated in the advanced usage
+documentation.
+
 .. _admin_integration:
 
 Integration with Django Admin

simple_history/middleware.py

@@ -0,0 +1,13 @@
+from . models import HistoricalRecords
+
+
+class HistoryRequestMiddleware(object):
+    """Expose request to HistoricalRecords.
+
+    This middleware sets request as a local thread variable, making it
+    available to the model-level utilities to allow tracking of the
+    authenticated user making a change.
+    """
+
+    def process_request(self, request):
+        HistoricalRecords.thread.request = request

simple_history/models.py

@@ -1,5 +1,6 @@
 from __future__ import unicode_literals
 
+import threading
 import copy
 try:
     from django.apps import apps  # Django >= 1.7
@@ -53,6 +54,8 @@ def python_2_unicode_compatible(klass):
 
 
 class HistoricalRecords(object):
+    thread = threading.local()
+
     def __init__(self, verbose_name=None, bases=(models.Model,)):
         self.user_set_verbose_name = verbose_name
         try:
@@ -213,14 +216,24 @@ def post_delete(self, instance, **kwargs):
 
     def create_historical_record(self, instance, type):
         history_date = getattr(instance, '_history_date', now())
-        history_user = getattr(instance, '_history_user', None)
+        history_user = self.get_history_user(instance)
         manager = getattr(instance, self.manager_name)
         attrs = {}
         for field in instance._meta.fields:
             attrs[field.attname] = getattr(instance, field.attname)
         manager.create(history_date=history_date, history_type=type,
                        history_user=history_user, **attrs)
 
+    def get_history_user(self, instance):
+        """Get the modifying user from instance or middleware."""
+        try:
+            return instance._history_user
+        except AttributeError:
+            try:
+                return self.thread.request.user
+            except AttributeError:
+                return
+
 
 class ForeignKeyMixin(object):
     def get_attname(self):

simple_history/tests/tests/test_admin.py

@@ -1,5 +1,6 @@
 from datetime import datetime, timedelta
 from django_webtest import WebTest
+from django.test.utils import override_settings
 from django import VERSION
 from django.core.urlresolvers import reverse
 try:
@@ -8,6 +9,7 @@
 except ImportError:  # django 1.4 compatibility
     from django.contrib.auth.models import User
 from django.contrib.admin.util import quote
+from django.conf import settings
 
 from ..models import Book, Person, Poll
 
@@ -156,3 +158,26 @@ def test_historical_user_with_setter(self):
         self.login()
         add_page = self.app.get(reverse('admin:tests_paper_add'))
         add_page.form.submit()
+
+    def test_history_user_not_saved(self):
+        self.login()
+        poll = Poll.objects.create(question="why?", pub_date=today)
+        historical_poll = poll.history.all()[0]
+        self.assertIsNone(
+            historical_poll.history_user,
+            "No way to know of request, history_user should be unset.",
+        )
+
+    def test_middleware_saves_user(self):
+        overridden_settings = {
+            'MIDDLEWARE_CLASSES':
+                settings.MIDDLEWARE_CLASSES
+                + ['simple_history.middleware.HistoryRequestMiddleware'],
+        }
+        with override_settings(**overridden_settings):
+            self.login()
+            poll = Poll.objects.create(question="why?", pub_date=today)
+            historical_poll = poll.history.all()[0]
+            self.assertEqual(historical_poll.history_user, self.user,
+                             "Middleware should make the request available to "
+                             "retrieve history_user.")

tox.ini

@@ -1,9 +1,10 @@
 [tox]
 envlist =
-    py26-1.3, py26-1.4, py26-1.5, py26-1.6,
-    py27-1.3, py27-1.4, py27-1.5, py27-1.6, py27-1.7, py27-trunk,
+    py26-1.4, py26-1.5, py26-1.6,
+    py27-1.4, py27-1.5, py27-1.6, py27-1.7, py27-trunk,
     py32-1.5, py32-1.6, py32-1.7, py32-trunk,
     py33-1.5, py33-1.6, py33-1.7, py33-trunk,
+    py34-1.7, py34-trunk,
     docs, flake8
 
 
@@ -27,28 +28,22 @@ exclude = __init__.py
 deps = flake8
 commands = flake8 simple_history
 
-[testenv:py26-1.3]
-basepython = python2.6
-deps =
-    django == 1.3.7
-    coverage == 3.6
-
 [testenv:py26-1.4]
 basepython = python2.6
 deps =
-    django == 1.4.10
+    django == 1.4.13
     coverage == 3.6
 
 [testenv:py26-1.5]
 basepython = python2.6
 deps =
-    django == 1.5.5
+    django == 1.5.8
     coverage == 3.6
 
 [testenv:py26-1.6]
 basepython = python2.6
 deps =
-    django == 1.6.2
+    django == 1.6.5
     coverage == 3.6
 
 [testenv:py26-trunk]
@@ -57,29 +52,22 @@ deps =
     https://github.com/django/django/tarball/master
     coverage == 3.6
 
-
-[testenv:py27-1.3]
-basepython = python2.7
-deps =
-    django == 1.3.7
-    coverage == 3.6
-
 [testenv:py27-1.4]
 basepython = python2.7
 deps =
-    django == 1.4.10
+    django == 1.4.13
     coverage == 3.6
 
 [testenv:py27-1.5]
 basepython = python2.7
 deps =
-    django == 1.5.5
+    django == 1.5.8
     coverage == 3.6
 
 [testenv:py27-1.6]
 basepython = python2.7
 deps =
-    django == 1.6.2
+    django == 1.6.5
     coverage == 3.6
 
 [testenv:py27-1.7]
@@ -98,13 +86,13 @@ deps =
 [testenv:py32-1.5]
 basepython = python3.2
 deps =
-    django == 1.5.5
+    django == 1.5.8
     coverage == 3.6
 
 [testenv:py32-1.6]
 basepython = python3.2
 deps =
-    django == 1.6.2
+    django == 1.6.5
     coverage == 3.6
 
 [testenv:py32-1.7]
@@ -123,13 +111,13 @@ deps =
 [testenv:py33-1.5]
 basepython = python3.3
 deps =
-    django == 1.5.5
+    django == 1.5.8
     coverage == 3.6
 
 [testenv:py33-1.6]
 basepython = python3.3
 deps =
-    django == 1.6.2
+    django == 1.6.5
     coverage == 3.6
 
 [testenv:py33-1.7]
@@ -143,3 +131,15 @@ basepython = python3.3
 deps =
     https://github.com/django/django/tarball/master
     coverage == 3.6
+
+[testenv:py34-1.7]
+basepython = python3.4
+deps =
+    https://github.com/django/django/tarball/stable/1.7.x
+    coverage == 3.6
+
+[testenv:py34-trunk]
+basepython = python3.4
+deps =
+    https://github.com/django/django/tarball/master
+    coverage == 3.6