Add regression test with a migration

Author: UnknownPlatypus

tests/assert_type/db/models/fields/test_dummy_migration.py

@@ -0,0 +1,135 @@
+# Regression test for false positives like this due to incomplete `Field` annotations.
+# Type annotations must provide the type vars otherwise they get inferred as `Field[Any, Any, Literal[False]]` in some
+# contexts, which is usually wrong. Annotations accepting any field should use `Field[Any, Any, Any]`
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+if TYPE_CHECKING:
+    from django.db.backends.base.schema import BaseDatabaseSchemaEditor
+    from django.db.migrations.state import StateApps
+
+
+def forwards(apps: StateApps, schema_editor: BaseDatabaseSchemaEditor) -> None:
+    pass
+
+
+def backwards(apps: StateApps, schema_editor: BaseDatabaseSchemaEditor) -> None:
+    pass
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("corporate", "0037_customerplanoffer"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="customerplanoffer",
+            name="sent_invoice_id",
+            field=models.CharField(max_length=255, null=True),
+        ),
+        migrations.AlterField(
+            model_name="customerplanoffer",
+            name="sent_invoice_id",
+            field=models.CharField(max_length=512, null=True),
+            preserve_default=False,
+        ),
+        migrations.RenameField(
+            model_name="customerplanoffer",
+            old_name="sent_invoice_id",
+            new_name="invoice_id",
+        ),
+        migrations.RemoveField(
+            model_name="customerplanoffer",
+            name="invoice_id",
+        ),
+        migrations.CreateModel(
+            name="Invoice",
+            fields=[
+                (
+                    "id",
+                    models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name="ID"),
+                ),
+                ("stripe_invoice_id", models.CharField(max_length=255, unique=True)),
+                ("status", models.SmallIntegerField()),
+                (
+                    "customer",
+                    models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to="corporate.customer"),
+                ),
+            ],
+            options={"db_table": "invoice"},
+        ),
+        migrations.RenameModel(old_name="Invoice", new_name="StripeInvoice"),
+        migrations.AlterModelTable(name="stripeinvoice", table="billing_stripe_invoice"),
+        migrations.AlterModelTableComment(name="stripeinvoice", table_comment="Stripe invoices"),
+        migrations.AlterModelOptions(
+            name="stripeinvoice",
+            options={"ordering": ["-id"], "verbose_name": "Stripe invoice"},
+        ),
+        migrations.AlterModelManagers(
+            name="stripeinvoice",
+            managers=[("objects", models.Manager())],
+        ),
+        migrations.AlterUniqueTogether(
+            name="stripeinvoice",
+            unique_together={("stripe_invoice_id", "customer")},
+        ),
+        migrations.AlterIndexTogether(
+            name="stripeinvoice",
+            index_together={("status", "customer")},
+        ),
+        migrations.AlterOrderWithRespectTo(
+            name="stripeinvoice",
+            order_with_respect_to="customer",
+        ),
+        migrations.AddIndex(
+            model_name="stripeinvoice",
+            index=models.Index(fields=["stripe_invoice_id"], name="invoice_stripe_idx"),
+        ),
+        migrations.RenameIndex(
+            model_name="stripeinvoice",
+            new_name="invoice_stripe_id_idx",
+            old_name="invoice_stripe_idx",
+        ),
+        migrations.RemoveIndex(
+            model_name="stripeinvoice",
+            name="invoice_stripe_id_idx",
+        ),
+        migrations.AddConstraint(
+            model_name="stripeinvoice",
+            constraint=models.UniqueConstraint(fields=["stripe_invoice_id"], name="invoice_stripe_id_uniq"),
+        ),
+        migrations.AlterConstraint(
+            model_name="stripeinvoice",
+            name="invoice_stripe_id_uniq",
+            constraint=models.UniqueConstraint(fields=["stripe_invoice_id", "customer"], name="invoice_stripe_id_uniq"),
+        ),
+        migrations.RemoveConstraint(
+            model_name="stripeinvoice",
+            name="invoice_stripe_id_uniq",
+        ),
+        migrations.RunSQL(
+            sql="UPDATE billing_stripe_invoice SET status = 0 WHERE status IS NULL",
+            reverse_sql=migrations.RunSQL.noop,
+        ),
+        migrations.RunPython(
+            code=forwards,
+            reverse_code=backwards,
+        ),
+        migrations.SeparateDatabaseAndState(
+            database_operations=[
+                migrations.RunSQL("CREATE INDEX legacy_idx ON billing_stripe_invoice(status)"),
+            ],
+            state_operations=[
+                migrations.AddIndex(
+                    model_name="stripeinvoice",
+                    index=models.Index(fields=["status"], name="legacy_idx"),
+                ),
+            ],
+        ),
+        migrations.DeleteModel(name="StripeInvoice"),
+    ]