Fixed #20594 -- Add validation to models.SlugField.

Thanks carbonXT for the report.

2 files changed, 3 insertions, 5 deletions

diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index 7d01391d4f..cf81a27997 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -1211,6 +1211,7 @@ class PositiveSmallIntegerField(IntegerField):
         return super(PositiveSmallIntegerField, self).formfield(**defaults)
 
 class SlugField(CharField):
+    default_validators = [validators.validate_slug]
     description = _("Slug (up to %(max_length)s)")
 
     def __init__(self, *args, **kwargs):
@@ -1320,12 +1321,12 @@ class TimeField(Field):
         return super(TimeField, self).formfield(**defaults)
 
 class URLField(CharField):
+    default_validators = [validators.URLValidator()]
     description = _("URL")
 
     def __init__(self, verbose_name=None, name=None, **kwargs):
         kwargs['max_length'] = kwargs.get('max_length', 200)
         CharField.__init__(self, verbose_name, name, **kwargs)
-        self.validators.append(validators.URLValidator())
 
     def formfield(self, **kwargs):
         # As with CharField, this will cause URL validation to be performed
diff --git a/django/forms/fields.py b/django/forms/fields.py
index ac68b9f1fc..420690704f 100644
--- a/django/forms/fields.py
+++ b/django/forms/fields.py
@@ -638,10 +638,7 @@ class URLField(CharField):
     default_error_messages = {
         'invalid': _('Enter a valid URL.'),
     }
-
-    def __init__(self, max_length=None, min_length=None, *args, **kwargs):
-        super(URLField, self).__init__(max_length, min_length, *args, **kwargs)
-        self.validators.append(validators.URLValidator())
+    default_validators = [validators.URLValidator()]
 
     def to_python(self, value):