[soc2010/query-refactor] Implemented __lt lookups for MongoDB.

git-svn-id: http://code.djangoproject.com/svn/django/branches/soc2010/query-refactor@13359 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/mongodb/compiler.py

@@ -25,7 +25,7 @@ def get_filters(self, where, correct=False):
         return filters
 
     def make_atom(self, lhs, lookup_type, value_annotation, params_or_value, negated):
-        assert lookup_type in ["exact", "isnull"], lookup_type
+        assert lookup_type in ["exact", "isnull", "lt"], lookup_type
         if hasattr(lhs, "process"):
             lhs, params = lhs.process(lookup_type, params_or_value, self.connection)
         else:
@@ -47,6 +47,8 @@ def make_atom(self, lhs, lookup_type, value_annotation, params_or_value, negated
             if value_annotation == negated:
                 val = {"$not": val}
             return column, val
+        elif lookup_type == "lt":
+            return column, {"$lt": params[0]}
 
     def correct_filters(self, filters):
         for k, v in filters.items():

tests/regressiontests/mongodb/tests.py

@@ -58,7 +58,7 @@ def test_foreignkey(self):
         self.assertFalse(hasattr(b, "_current_group_cache"))
         self.assertEqual(b.current_group, e)
 
-    def test_lookup(self):
+    def test_not_equals(self):
         q = Group.objects.create(name="Queen", year_formed=1971)
         e = Group.objects.create(name="The E Street Band", year_formed=1972)
 
@@ -80,3 +80,29 @@ def test_lookup(self):
             ],
             lambda g: g.name,
         )
+
+    def test_less_than(self):
+        q = Group.objects.create(name="Queen", year_formed=1971)
+        e = Group.objects.create(name="The E Street Band", year_formed=1972)
+
+        self.assertQuerysetEqual(
+            Group.objects.filter(year_formed__lt=1980), [
+                "Queen",
+                "The E Street Band",
+            ],
+            lambda g: g.name
+        )
+
+        self.assertQuerysetEqual(
+            Group.objects.filter(year_formed__lt=1972), [
+                "Queen",
+            ],
+            lambda g: g.name
+        )
+
+        self.assertQuerysetEqual(
+            Group.objects.filter(year_formed__lt=1971),
+            [],
+            lambda g: g.name
+        )
+