Fixed #15604 -- Changed django.db.models.permalink to use wraps() so that it doesn't eat the docstring. Thanks for the report, sfllaw. Also added tests.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15798 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/model_permalink/models.py

@@ -0,0 +1,10 @@
+from django.db import models
+
+class Guitarist(models.Model):
+    name = models.CharField(max_length=50)
+    slug = models.CharField(max_length=50)
+
+    @models.permalink
+    def url(self):
+        "Returns the URL for this guitarist."
+        return ('guitarist_detail', [self.slug])