From c238e65e29494042d6ccf925c0a06a3135619799 Mon Sep 17 00:00:00 2001
From: Chason Chaffin <chason@gmail.com>
Date: Wed, 3 Jul 2019 18:32:43 +0900
Subject: [PATCH] Fixed #30596 -- Fixed SplitArrayField.has_changed() for
 non-string base fields.

Thanks to Evgeniy Krysanov for the report and the idea to use to_python.
Thanks to Mariusz Felisiak for the test case.
---
 django/contrib/postgres/forms/array.py |  4 ++++
 tests/postgres_tests/test_array.py     | 12 ++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/django/contrib/postgres/forms/array.py b/django/contrib/postgres/forms/array.py
index 554a39d4f6b..3de1fd86cb9 100644
--- a/django/contrib/postgres/forms/array.py
+++ b/django/contrib/postgres/forms/array.py
@@ -178,6 +178,10 @@ class SplitArrayField(forms.Field):
         kwargs.setdefault('widget', widget)
         super().__init__(**kwargs)
 
+    def to_python(self, value):
+        value = super().to_python(value)
+        return [self.base_field.to_python(item) for item in value]
+
     def clean(self, value):
         cleaned_data = []
         errors = []
diff --git a/tests/postgres_tests/test_array.py b/tests/postgres_tests/test_array.py
index d7ed5223e36..170c1caa0a1 100644
--- a/tests/postgres_tests/test_array.py
+++ b/tests/postgres_tests/test_array.py
@@ -909,6 +909,18 @@ class TestSplitFormField(PostgreSQLSimpleTestCase):
         obj = form.save(commit=False)
         self.assertEqual(obj.field, [1, 2])
 
+    def test_splitarrayfield_has_changed(self):
+        class Form(forms.ModelForm):
+            field = SplitArrayField(forms.IntegerField(), required=False, size=2)
+
+            class Meta:
+                model = IntegerArrayModel
+                fields = ('field',)
+
+        obj = IntegerArrayModel(field=[1, 2])
+        form = Form({'field_0': '1', 'field_1': '2'}, instance=obj)
+        self.assertFalse(form.has_changed())
+
 
 class TestSplitFormWidget(PostgreSQLWidgetTestCase):