[soc2009/model-validation] Added capacity for ComplexValidator handling to models

git-svn-id: http://code.djangoproject.com/svn/django/branches/soc2009/model-validation@11271 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/modeltests/validation/models.py

@@ -1,6 +1,7 @@
 from datetime import datetime
 
 from django.core.exceptions import ValidationError
+from django.core.validators import ComplexValidator
 from django.db import models
 from django.test import TestCase
 
@@ -8,13 +9,21 @@ def validate_answer_to_universe(value):
     if value != 42:
         raise ValidationError('This is not the answer to life, universe and everything!')
 
+class ValidateFieldNotEqualsOtherField(ComplexValidator):
+    def __init__(self, other_field):
+        self.other_field = other_field
+
+    def __call__(self, value, all_values={}, obj=None):
+        if value == self.get_value(self.other_field, all_values, obj):
+            raise ValidationError("Must not equal to %r's value" % self.other_field)
+
 class ModelToValidate(models.Model):
     name = models.CharField(max_length=100)
     created = models.DateTimeField(default=datetime.now)
     number = models.IntegerField()
     parent = models.ForeignKey('self', blank=True, null=True)
     email = models.EmailField(blank=True)
-    f_with_custom_validator = models.IntegerField(blank=True, null=True, validators=[validate_answer_to_universe])
+    f_with_custom_validator = models.IntegerField(blank=True, null=True, validators=[validate_answer_to_universe, ValidateFieldNotEqualsOtherField('number')])
 
     def validate(self):
         super(ModelToValidate, self).validate()