fix bugs
diff --git a/plstackapi/core/models/slice.py b/plstackapi/core/models/slice.py
index 63941c7..4182e2f 100644
--- a/plstackapi/core/models/slice.py
+++ b/plstackapi/core/models/slice.py
@@ -12,7 +12,7 @@
 
 class Slice(PlCoreBase):
     tenant_id = models.CharField(max_length=200, help_text="Keystone tenant id")
-    name = models.CharField(help_text="The Name of the Slice", max_length=80)
+    name = models.CharField(unique=True, help_text="The Name of the Slice", max_length=80)
     enabled = models.BooleanField(default=True, help_text="Status for this Slice")
     SLICE_CHOICES = (('plc', 'PLC'), ('delegated', 'Delegated'), ('controller','Controller'), ('none','None'))
     instantiation = models.CharField(help_text="The instantiation type of the slice", max_length=80, choices=SLICE_CHOICES)