Don't crash on non ascii bytestrings in db params.

Thanks Karen Tracey for the report. Fix #422.

4 files changed, 10 insertions, 4 deletions

diff --git a/debug_toolbar/utils/tracking/db.py b/debug_toolbar/utils/tracking/db.py
index b6bbb66..b4ceff0 100644
--- a/debug_toolbar/utils/tracking/db.py
+++ b/debug_toolbar/utils/tracking/db.py
@@ -73,8 +73,7 @@ class NormalCursorWrapper(object):
 
     def _quote_expr(self, element):
         if isinstance(element, six.string_types):
-            element = element.replace("'", "''")
-            return "'%s'" % element
+            return "'%s'" % force_text(element).replace("'", "''")
         else:
             return repr(element)
 
diff --git a/tests/tests.py b/tests/tests.py
index 3c28f79..7fb4a87 100644
--- a/tests/tests.py
+++ b/tests/tests.py
@@ -169,6 +169,10 @@ class DebugToolbarIntegrationTestCase(TestCase):
         self.assertContains(response, 'LÀTÍN')      # template
         self.assertContains(response, 'djDebug')    # toolbar
 
+    def test_non_ascii_bytes_in_db_params(self):
+        response = self.client.get('/non_ascii_bytes_in_db_params/')
+        self.assertContains(response, 'djàngó')
+
     def test_non_ascii_session(self):
         response = self.client.get('/set_session/')
         self.assertContains(response, 'où')
diff --git a/tests/urls.py b/tests/urls.py
index 4bed492..8a88385 100644
--- a/tests/urls.py
+++ b/tests/urls.py
@@ -1,3 +1,5 @@
+# coding: utf-8
+
 """
 URLpatterns for the debug toolbar.
 
@@ -22,6 +24,7 @@ urlpatterns = patterns('tests.views',
     url(r'^resolving3/(.+)/$', 'resolving_view', { 'arg2' : 'default' }),
     url(r'^regular/(?P<title>.*)/$', 'regular_view'),
     url(r'^non_ascii_context/$', 'non_ascii_context'),
+    url(r'^non_ascii_bytes_in_db_params/$', 'new_user', {'username': 'djàngó'.encode('utf-8')}),
     url(r'^non_ascii_request/$', 'regular_view', {'title': NonAsciiRepr()}),
     url(r'^new_user/$', 'new_user'),
     url(r'^execute_sql/$', 'execute_sql'),
diff --git a/tests/views.py b/tests/views.py
index e6d9ebb..01c4971 100644
--- a/tests/views.py
+++ b/tests/views.py
@@ -23,8 +23,8 @@ def regular_view(request, title):
     return render(request, 'basic.html', {'title': title})
 
 
-def new_user(request):
-    User.objects.create_user(username='joe')
+def new_user(request, username='joe'):
+    User.objects.create_user(username=username)
     return render(request, 'basic.html', {'title': 'new user'})