diff --git a/fields.py b/fields.py
index a4ea2d5..95d3890 100644
--- a/fields.py
+++ b/fields.py
@@ -2,7 +2,7 @@ import uuid
 import re
 
 from django.db import models
-from django.utils.translation import ugettext as _
+from django.utils.translation import ugettext_lazy as _
 from django.core.exceptions import ValidationError
 
 class EavSlugField(models.SlugField):
@@ -26,4 +26,6 @@ class EavSlugField(models.SlugField):
         name = re.sub('\s+', '_', name)
 
         # Remove non alphanumeric characters
-        name = re.sub('[^\w]', '', name)
+        return re.sub('[^\w]', '', name)
+        
+        
diff --git a/models.py b/models.py
index a8934cf..90198e8 100644
--- a/models.py
+++ b/models.py
@@ -1,4 +1,5 @@
 import re
+from datetime import datetime
 
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
@@ -21,7 +22,7 @@ class EavAttribute(models.Model):
     The A model in E-A-V. This holds the 'concepts' along with the data type
     something like:
 
-    >>> EavAttribute.objects.create(name='Height', datatype='float', slug='height')
+    >>> EavAttribute.objects.create(name='Height', datatype='float')
     <EavAttribute: Height (Float)>
 
     >>> EavAttribute.objects.create(name='Color', datatype='text', slug='color')
@@ -60,6 +61,10 @@ class EavAttribute(models.Model):
     datatype = models.CharField(_(u"data type"), max_length=6,
                                 choices=DATATYPE_CHOICES)
 
+    created = models.DateTimeField(_(u"created"), default=datetime.now)
+
+    modified = models.DateTimeField(_(u"modified"), auto_now=True)
+
     labels = models.ManyToManyField(EavAttributeLabel,
                                     verbose_name=_(u"labels"))
 
@@ -137,6 +142,13 @@ class EavValue(models.Model):
 
     attribute = models.ForeignKey(EavAttribute)
 
+    def save(self, *args, **kwargs):
+        self.full_clean()
+        super(EavValue, self).save(*args, **kwargs)
+
+    def clean(self):
+        pass
+
     def _blank(self):
         self.value_text = self.value_float = self.value_int = self.value_date = None