[2.2.x] Fixed #30870 -- Fixed showing that RunPython operations are irreversible by migrate --plan.

Thanks Hasan Ramezani for the initial patch and Kyle Dickerson for the
report.

Backport of 06d34aab7cfb1632a1538a243db81f24498525ff from master.

2 files changed, 44 insertions, 0 deletions

diff --git a/tests/migrations/test_commands.py b/tests/migrations/test_commands.py
index 36e8f2f5ea..06cc77287e 100644
--- a/tests/migrations/test_commands.py
+++ b/tests/migrations/test_commands.py
@@ -360,6 +360,28 @@ class MigrateTests(MigrationTestBase):
             '    Raw SQL operation -> IRREVERSIBLE\n',
             out.getvalue()
         )
+        out = io.StringIO()
+        call_command('migrate', 'migrations', '0005', plan=True, stdout=out, no_color=True)
+        # Operation is marked as irreversible only in the revert plan.
+        self.assertEqual(
+            'Planned operations:\n'
+            'migrations.0005_fifth\n'
+            '    Raw Python operation\n'
+            '    Raw Python operation\n'
+            '    Raw Python operation -> Feed salamander.\n',
+            out.getvalue()
+        )
+        call_command('migrate', 'migrations', '0005', verbosity=0)
+        out = io.StringIO()
+        call_command('migrate', 'migrations', '0004', plan=True, stdout=out, no_color=True)
+        self.assertEqual(
+            'Planned operations:\n'
+            'migrations.0005_fifth\n'
+            '    Raw Python operation -> IRREVERSIBLE\n'
+            '    Raw Python operation -> IRREVERSIBLE\n'
+            '    Raw Python operation\n',
+            out.getvalue()
+        )
         # Cleanup by unmigrating everything: fake the irreversible, then
         # migrate all to zero.
         call_command('migrate', 'migrations', '0003', fake=True, verbosity=0)
diff --git a/tests/migrations/test_migrations_plan/0005_fifth.py b/tests/migrations/test_migrations_plan/0005_fifth.py
new file mode 100644
index 0000000000..3c569ffded
--- /dev/null
+++ b/tests/migrations/test_migrations_plan/0005_fifth.py
@@ -0,0 +1,22 @@
+from django.db import migrations
+
+
+def grow_tail(x, y):
+    pass
+
+
+def feed(x, y):
+    """Feed salamander."""
+    pass
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('migrations', '0004_fourth'),
+    ]
+
+    operations = [
+        migrations.RunPython(migrations.RunPython.noop),
+        migrations.RunPython(grow_tail),
+        migrations.RunPython(feed, migrations.RunPython.noop),
+    ]