Refs #1873 -- Used GET.lists() in admin filters.

1 files changed, 7 insertions, 0 deletions

diff --git a/django/contrib/admin/utils.py b/django/contrib/admin/utils.py
index b971bd528f..90442788c9 100644
--- a/django/contrib/admin/utils.py
+++ b/django/contrib/admin/utils.py
@@ -54,10 +54,17 @@ def lookup_spawns_duplicates(opts, lookup_path):
     return False
 
 
+def get_last_value_from_parameters(parameters, key):
+    value = parameters.get(key)
+    return value[-1] if isinstance(value, list) else value
+
+
 def prepare_lookup_value(key, value, separator=","):
     """
     Return a lookup value prepared to be used in queryset filtering.
     """
+    if isinstance(value, list):
+        value = value[-1]
     # if key ends with __in, split parameter into separate values
     if key.endswith("__in"):
         value = value.split(separator)