[soc2009/multidb] Made filter SQL generation lazy when we aren't filtering on a specific field, also added additional tests

git-svn-id: http://code.djangoproject.com/svn/django/branches/soc2009/multidb@10923 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/multiple_database/models.py

@@ -2,6 +2,10 @@ from django.db import models
 
 class Book(models.Model):
     title = models.CharField(max_length=100)
+    published = models.DateField()
 
     def __unicode__(self):
         return self.title
+
+    class Meta:
+        ordering = ('title',)