[1.0.X] Fixed #10692 -- Fixed DecimalField lookups for extreme values.

Backport of r10545 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10546 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/fields/__init__.py

@@ -611,10 +611,13 @@ class DecimalField(Field):
         from django.db.backends import util
         return util.format_number(value, self.max_digits, self.decimal_places)
 
-    def get_db_prep_value(self, value):
+    def get_db_prep_save(self, value):
         return connection.ops.value_to_db_decimal(self.to_python(value),
                 self.max_digits, self.decimal_places)
 
+    def get_db_prep_value(self, value):
+        return self.to_python(value)
+
     def formfield(self, **kwargs):
         defaults = {
             'max_digits': self.max_digits,

tests/regressiontests/model_fields/tests.py

@@ -1,10 +1,13 @@
 import datetime
 import unittest
+
 import django.test
 from django import forms
 from django.db import models
 from django.core.exceptions import ValidationError
+
 from models import Foo, Bar, Whiz, BigD, BigS
+
 try:
     from decimal import Decimal
 except ImportError:
@@ -38,7 +41,7 @@ class DecimalFieldTests(django.test.TestCase):
         Foo.objects.create(id=1, a='abc', d=Decimal("12.34"))
         self.assertEqual(list(Foo.objects.filter(d=u'1.23')), [])
 
-    def test_save_wihout_float_conversion(self):
+    def test_save_without_float_conversion(self):
         """
         Ensure decimals don't go through a corrupting float conversion during
         save (#5079).
@@ -48,6 +51,14 @@ class DecimalFieldTests(django.test.TestCase):
         bd = BigD.objects.get(pk=bd.pk)
         self.assertEqual(bd.d, Decimal("12.9"))
 
+    def test_lookup_really_big_value(self):
+        """
+        Ensure that really big values can be used in a filter statement, even
+        with older Python versions.
+        """
+        # This should not crash. That counts as a win for our purposes.
+        Foo.objects.filter(d__gte=100000000000)
+
 class ForeignKeyTests(django.test.TestCase):
     def test_callable_default(self):
         """Test the use of a lazy callable for ForeignKey.default"""
@@ -120,3 +131,4 @@ class SlugFieldTests(django.test.TestCase):
         bs = BigS.objects.create(s = 'slug'*50)
         bs = BigS.objects.get(pk=bs.pk)
         self.assertEqual(bs.s, 'slug'*50)
+