Fix bug in django field.

setup.py

@@ -2,7 +2,7 @@
 
 from setuptools import setup, find_packages
 
-__version__ = "0.1.3"
+__version__ = "0.1.4"
 
 
 def file_read(filename):

staticmodel/django/fields.py

@@ -61,20 +61,29 @@ def to_python(self, db_value):
             return self._static_model.members.get(
                 **{self._value_field_name: super_value})
 
+    def from_db_value(self, value, expression, connection, context):
+        return self._static_model.members.get(**{self._value_field_name: value})
 
-class StaticModelCharField(
-        six.with_metaclass(models.SubfieldBase, StaticModelFieldMixin,
-                           models.CharField)):
+
+class StaticModelCharField(StaticModelFieldMixin, models.CharField):
     def _validate_member_value(self, member, value):
         if not isinstance(value, six.string_types):
             raise ValueError('Field {!r} of member {!r} must be a string.'.format(
                 self._value_field_name, member._member_name))
 
+    def from_db_value(self, value, expression, connection, context):
+        value = str(value)
+        return super(StaticModelCharField, self).from_db_value(
+            value, expression, connection, context)
+
 
-class StaticModelIntegerField(
-        six.with_metaclass(models.SubfieldBase, StaticModelFieldMixin,
-                           models.IntegerField)):
+class StaticModelIntegerField(StaticModelFieldMixin, models.IntegerField):
     def _validate_member_value(self, member, value):
         if not isinstance(value, six.integer_types):
             raise ValueError('Field {!r} of member {!r} must be an integer.'.format(
                 self._value_field_name, member._member_name))
+
+    def from_db_value(self, value, expression, connection, context):
+        value = int(value)
+        return super(StaticModelIntegerField, self).from_db_value(
+            value, expression, connection, context)