Updated EmailField length to support long domains (#243)

docs/changelog.rst

@@ -4,6 +4,7 @@ Changelog
 
 Changes in 0.7.10
 =================
+- Updated EmailField length to support long domains (#243)
 - Added 64-bit integer support (#251)
 - Added Django sessions TTL support (#224)
 - Fixed issue with numerical keys in MapField(EmbeddedDocumentField()) (#240)

mongoengine/fields.py

@@ -143,7 +143,7 @@ class EmailField(StringField):
     EMAIL_REGEX = re.compile(
         r"(^[-!#$%&'*+/=?^_`{}|~0-9A-Z]+(\.[-!#$%&'*+/=?^_`{}|~0-9A-Z]+)*"  # dot-atom
         r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-011\013\014\016-\177])*"'  # quoted-string
-        r')@(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+[A-Z]{2,6}\.?$', re.IGNORECASE  # domain
+        r')@(?:[A-Z0-9](?:[A-Z0-9-]{0,253}[A-Z0-9])?\.)+[A-Z]{2,6}\.?$', re.IGNORECASE  # domain
     )
 
     def validate(self, value):

tests/test_fields.py

@@ -2371,12 +2371,26 @@ class FieldTest(unittest.TestCase):
             self.assertTrue(1 in error_dict['comments'])
             self.assertTrue('content' in error_dict['comments'][1])
             self.assertEqual(error_dict['comments'][1]['content'],
-                              u'Field is required')
+                             u'Field is required')
-
 
         post.comments[1].content = 'here we go'
         post.validate()
 
+    def test_email_field(self):
+        class User(Document):
+            email = EmailField()
+
+        user = User(email="ross@example.com")
+        self.assertTrue(user.validate() is None)
+
+        user = User(email=("Kofq@rhom0e4klgauOhpbpNdogawnyIKvQS0wk2mjqrgGQ5S"
+                           "ucictfqpdkK9iS1zeFw8sg7s7cwAF7suIfUfeyueLpfosjn3"
+                           "aJIazqqWkm7.net"))
+        self.assertTrue(user.validate() is None)
+
+        user = User(email='me@localhost')
+        self.assertRaises(ValidationError, user.validate)
+
     def test_email_field_honors_regex(self):
         class User(Document):
             email = EmailField(regex=r'\w+@example.com')