Refs #27003 -- Fixed SimpleArrayField crash on converted values.

AUTHORS

@@ -110,6 +110,7 @@ answer newbie questions, and generally made Django that much better:
     Bouke Haarsma <bouke@haarsma.eu>
     Božidar Benko <bbenko@gmail.com>
     Brad Melin <melinbrad@gmail.com>
+    Brandon Chinn <http://brandonchinn178.github.io>
     Brant Harris
     Brendan Hayward <brendanhayward85@gmail.com>
     Brenton Simpson <http://theillustratedlife.com>

django/contrib/postgres/forms/array.py

@@ -35,7 +35,9 @@ class SimpleArrayField(forms.CharField):
         return value
 
     def to_python(self, value):
-        if value:
+        if isinstance(value, list):
+            items = value
+        elif value:
             items = value.split(self.delimiter)
         else:
             items = []

tests/postgres_tests/test_array.py

@@ -677,6 +677,11 @@ class TestSimpleFormField(PostgreSQLTestCase):
         self.assertIsInstance(form_field, SimpleArrayField)
         self.assertEqual(form_field.max_length, 4)
 
+    def test_already_converted_value(self):
+        field = SimpleArrayField(forms.CharField())
+        vals = ['a', 'b', 'c']
+        self.assertEqual(field.clean(vals), vals)
+
 
 class TestSplitFormField(PostgreSQLTestCase):