[soc2009/model-validation] Added validators to DbFields

ComplexValidators are not yet run on the model and custom message
overring is still not in place

git-svn-id: http://code.djangoproject.com/svn/django/branches/soc2009/model-validation@11037 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/fields/__init__.py

@@ -58,13 +58,14 @@ class Field(object):
     # creates, creation_counter is used for all user-specified fields.
     creation_counter = 0
     auto_creation_counter = -1
+    default_validators = []
 
     def __init__(self, verbose_name=None, name=None, primary_key=False,
             max_length=None, unique=False, blank=False, null=False,
             db_index=False, rel=None, default=NOT_PROVIDED, editable=True,
             serialize=True, unique_for_date=None, unique_for_month=None,
             unique_for_year=None, choices=None, help_text='', db_column=None,
-            db_tablespace=None, auto_created=False):
+            db_tablespace=None, auto_created=False, validators=[]):
         self.name = name
         self.verbose_name = verbose_name
         self.primary_key = primary_key
@@ -97,6 +98,8 @@ class Field(object):
             self.creation_counter = Field.creation_counter
             Field.creation_counter += 1
 
+        self.validators = self.default_validators + validators
+
     def __cmp__(self, other):
         # This is needed because bisect does not take a comparison function.
         return cmp(self.creation_counter, other.creation_counter)
@@ -118,6 +121,22 @@ class Field(object):
         """
         return value
 
+    def run_validators(self, value):
+        if value in validators.EMPTY_VALUES:
+            return
+
+        errors = []
+        for v in self.validators:
+            # don't run complex validators since they need model_instance
+            # and must therefore be run on the model level
+            if not isinstance(v, validators.ComplexValidator):
+                try:
+                    v(value)
+                except exceptions.ValidationError, e:
+                    errors.extend(e.messages)
+        if errors:
+            raise exceptions.ValidationError(errors)
+    
     def validate(self, value, model_instance):
         """
         Validates value and throws ValidationError. Subclasses should override
@@ -140,6 +159,7 @@ class Field(object):
                 ugettext_lazy("This field cannot be blank."))
 
 
+
     def clean(self, value, model_instance):
         """
         Convert the value's type and wun validation. Validation errors from to_python
@@ -148,6 +168,7 @@ class Field(object):
         """
         value = self.to_python(value)
         self.validate(value, model_instance)
+        self.run_validators(value)
         return value
 
     def db_type(self):
@@ -666,15 +687,11 @@ class DecimalField(Field):
         return super(DecimalField, self).formfield(**defaults)
 
 class EmailField(CharField):
+    default_validators = [validators.validate_email]
     def __init__(self, *args, **kwargs):
         kwargs['max_length'] = kwargs.get('max_length', 75)
         CharField.__init__(self, *args, **kwargs)
 
-    def formfield(self, **kwargs):
-        defaults = {'form_class': forms.EmailField}
-        defaults.update(kwargs)
-        return super(EmailField, self).formfield(**defaults)
-
 class FilePathField(Field):
     def __init__(self, verbose_name=None, name=None, path='', match=None, recursive=False, **kwargs):
         self.path, self.match, self.recursive = path, match, recursive

tests/modeltests/validation/models.py

@@ -4,11 +4,17 @@ from django.core.exceptions import ValidationError
 from django.db import models
 from django.test import TestCase
 
+def validate_answer_to_universe(value):
+    if value != 42:
+        raise ValidationError('This is not the answer to life, universe and everything!')
+
 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])
 
     def validate(self):
         super(ModelToValidate, self).validate()

tests/modeltests/validation/tests.py

@@ -7,13 +7,16 @@ from django.db import models
 from models import *
 
 class BaseModelValidationTests(TestCase):
+    def assertFailsValidation(self, clean, failed_fields):
+        self.assertRaises(ValidationError, clean)
+        try:
+            clean()
+        except ValidationError, e:
+            self.assertEquals(sorted(failed_fields), sorted(e.message_dict.keys()))
+
     def test_missing_required_field_raises_error(self):
         mtv = ModelToValidate()
-        self.assertRaises(ValidationError, mtv.clean)
-        try:
-            mtv.clean()
-        except ValidationError, e:
-            self.assertEquals(['name', 'number'], sorted(e.message_dict.keys()))
+        self.assertFailsValidation(mtv.clean, ['name', 'number'])
     
     def test_with_correct_value_model_validates(self):
         mtv = ModelToValidate(number=10, name='Some Name')
@@ -21,25 +24,33 @@ class BaseModelValidationTests(TestCase):
 
     def test_custom_validate_method_is_called(self):
         mtv = ModelToValidate(number=11)
-        self.assertRaises(ValidationError, mtv.clean)
-        try:
-            mtv.clean()
-        except ValidationError, e:
-            self.assertEquals(sorted([NON_FIELD_ERRORS, 'name']), sorted(e.message_dict.keys()))
+        self.assertFailsValidation(mtv.clean, [NON_FIELD_ERRORS, 'name'])
 
     def test_wrong_FK_value_raises_error(self):
         mtv=ModelToValidate(number=10, name='Some Name', parent_id=3)
-        self.assertRaises(ValidationError, mtv.clean)
-        try:
-            mtv.clean()
-        except ValidationError, e:
-            self.assertEquals(['parent'], e.message_dict.keys())
+        self.assertFailsValidation(mtv.clean, ['parent'])
 
     def test_correct_FK_value_cleans(self):
         parent = ModelToValidate.objects.create(number=10, name='Some Name')
         mtv=ModelToValidate(number=10, name='Some Name', parent_id=parent.pk)
         self.assertEqual(None, mtv.clean())
 
+    def test_wrong_email_value_raises_error(self):
+        mtv = ModelToValidate(number=10, name='Some Name', email='not-an-email')
+        self.assertFailsValidation(mtv.clean, ['email'])
+
+    def test_correct_email_value_passes(self):
+        mtv = ModelToValidate(number=10, name='Some Name', email='valid@email.com')
+        self.assertEqual(None, mtv.clean())
+
+    def test_custom_validator_passes_for_correct_value(self):
+        mtv = ModelToValidate(number=10, name='Some Name', f_with_custom_validator=42)
+        self.assertEqual(None, mtv.clean())
+
+    def test_custom_validator_raises_error_for_incorrect_value(self):
+        mtv = ModelToValidate(number=10, name='Some Name', f_with_custom_validator=12)
+        self.assertFailsValidation(mtv.clean, ['f_with_custom_validator'])
+
 class GetUniqueCheckTests(unittest.TestCase):
     def test_unique_fields_get_collected(self):
         m = UniqueFieldsModel()