flush requires migrations

[tanner]

./manage flush

raises

RuntimeError: Error creating new content types. Please make sure contenttypes is migrated before trying to migrate apps individually.

if migrations have not been applied or the database does not yet exist.

I think it should just exit normally in this case.

[Claude Paroz]

Suggested change:

django/core/management/commands/flush.py

@@ -46 +46 @@
         sql_list = sql_flush(self.style, connection, only_django=True,
                              reset_sequences=reset_sequences,
                              allow_cascade=allow_cascade)
+        if not sql_list:
+            raise CommandError(
+                "No commands to proceed with, maybe the database is still empty?"
+            )
 
         if interactive:
             confirm = input("""You have requested a flush of the database.

I'm not absolutely convinced about the need to write a test for that...

[tanner]

looks good. thank you

[Claude Paroz <claude@…>]

In 9f1dbe29c0dbae57ff7950f3f64a0d083177cca8:

Fixed #24369 -- Prevented crash when flushing before db migration

Thanks Thomas Tanner for the report.

[Claude Paroz <claude@…>]

In 90ab6ee6123f2b378a068988526b409854ddec77:

Revert "Fixed #24369 -- Prevented crash when flushing before db migration"

This reverts commit 9f1dbe29c0dbae57ff7950f3f64a0d083177cca8.
The proposed solution does not pass the test suite.

[Claude Paroz <claude@…>]

In 767c33d1fa9827908192e8ed1ac7f281f56bd811:

Fixed #24369 -- Prevented crash when flushing before db migration

Thanks Thomas Tanner for the report and Tim Graham for the review.