Fix issue getting IntegerField validators.

CHANGES.rst

@@ -4,6 +4,8 @@ CHANGES
 master (unreleased)
 -------------------
 
+* Fix issue getting IntegerField validators.
+
 
 0.2 (2015.05.28)
 ----------------

fernet_fields/fields.py

@@ -31,6 +31,8 @@
 
 class EncryptedField(models.Field):
     """A field that encrypts values using Fernet symmetric encryption."""
+    _internal_type = 'BinaryField'
+
     def __init__(self, *args, **kwargs):
         if kwargs.get('primary_key'):
             raise ImproperlyConfigured(
@@ -69,7 +71,7 @@ def fernet(self):
         return MultiFernet([Fernet(k) for k in self.fernet_keys])
 
     def get_internal_type(self):
-        return 'BinaryField'
+        return self._internal_type
 
     def get_db_prep_save(self, value, connection):
         value = super(
@@ -90,6 +92,19 @@ def from_db_value(self, value, expression, connection, context):
             value = bytes(value)
             return self.to_python(force_text(self.fernet.decrypt(value)))
 
+    @cached_property
+    def validators(self):
+        # Temporarily pretend to be whatever type of field we're masquerading
+        # as, for purposes of constructing validators (needed for
+        # IntegerField and subclasses).
+        self.__dict__['_internal_type'] = super(
+            EncryptedField, self
+        ).get_internal_type()
+        try:
+            return super(EncryptedField, self).validators
+        finally:
+            del self.__dict__['_internal_type']
+
 
 class EncryptedTextField(EncryptedField, models.TextField):
     pass

fernet_fields/test/test_fields.py

@@ -50,6 +50,12 @@ def test_not_allowed(self, key):
         with pytest.raises(ImproperlyConfigured):
             fields.EncryptedIntegerField(**{key: True})
 
+    def test_get_integer_field_validators(self):
+        f = fields.EncryptedIntegerField()
+
+        # Raises no error
+        f.validators
+
 
 @pytest.mark.parametrize(
     'model,vals',