Fixed #24001 -- Added range fields for PostgreSQL.

Added support for PostgreSQL range types to contrib.postgres.

- 5 new model fields
- 4 new form fields
- New validators
- Uses psycopg2's range type implementation in python

1 files changed, 14 insertions, 1 deletions

diff --git a/django/contrib/postgres/validators.py b/django/contrib/postgres/validators.py
index 19d0a69765..49ec921db1 100644
--- a/django/contrib/postgres/validators.py
+++ b/django/contrib/postgres/validators.py
@@ -1,7 +1,10 @@
 import copy
 
 from django.core.exceptions import ValidationError
-from django.core.validators import MaxLengthValidator, MinLengthValidator
+from django.core.validators import (
+    MaxLengthValidator, MinLengthValidator, MaxValueValidator,
+    MinValueValidator,
+)
 from django.utils.deconstruct import deconstructible
 from django.utils.translation import ungettext_lazy, ugettext_lazy as _
 
@@ -63,3 +66,13 @@ class KeysValidator(object):
 
     def __ne__(self, other):
         return not (self == other)
+
+
+class RangeMaxValueValidator(MaxValueValidator):
+    compare = lambda self, a, b: a.upper > b
+    message = _('Ensure that this range is completely less than or equal to %(limit_value)s.')
+
+
+class RangeMinValueValidator(MinValueValidator):
+    compare = lambda self, a, b: a.lower < b
+    message = _('Ensure that this range is completely greater than or equal to %(limit_value)s.')