HashField cannot be marked as unique (this doesn't make any sense)

limpyd/fields.py

@@ -175,6 +175,7 @@ class RedisField(RedisProxyCommand):
         'kwargs': ['lockable', 'default'],
         'attrs': ['name', '_instance', '_model', 'indexable', 'unique']
     }
+    _unique_supported = True
 
     def __init__(self, *args, **kwargs):
         """
@@ -187,6 +188,8 @@ def __init__(self, *args, **kwargs):
         self.indexable = kwargs.get("indexable", False)
         self.unique = kwargs.get("unique", False)
         if self.unique:
+            if not self._unique_supported:
+                raise ImplementationError('%s field cannot be unique' % self.__class__.__name__)
             if hasattr(self, "default"):
                 raise ImplementationError('Cannot set "default" and "unique" together!')
             self.indexable = True
@@ -819,6 +822,7 @@ def _call_linsert(self, command, where, refvalue, value):
 
 class HashField(MultiValuesField):
 
+    _unique_supported = False
     proxy_getter = "hgetall"
     proxy_setter = "hmset"
 

tests/fields/hash.py

@@ -2,6 +2,7 @@
 from __future__ import unicode_literals
 
 from limpyd import fields
+from limpyd.exceptions import ImplementationError
 
 from ..model import TestRedisModel, BaseModelTest
 
@@ -182,3 +183,8 @@ def test_hlen_should_return_number_of_keys(self):
         self.assertEqual(obj.headers.hlen(), 0)
         obj.headers.hmset(**headers)
         self.assertEqual(obj.headers.hlen(), 2)
+
+    def test_hashfields_cannot_be_unique(self):
+        with self.assertRaises(ImplementationError):
+            class TestUniquenessHashField(TestRedisModel):
+                data = fields.HashField(indexable=True, unique=True)