m2ms with intermediaries break manage.py reset
|Reported by:||Dougal Sutherland||Owned by:||nobody|
|Has patch:||yes||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
Using the new intermediaries on many-to-many models breaks the functionality of manage.py reset for me.
More specifically, if I create a project "testing" and an application "tests", and put the following models in:
class Band(models.Model): name = models.CharField(max_length=100) class Musician(models.Model): name = models.CharField(max_length=100) bands = models.ManyToManyField(Band, through='Membership') class Membership(models.Model): band = models.ForeignKey(Band) musician = models.ForeignKey(Musician) join_date = models.DateField()
after syncdb'ing, if I then try "manage.py reset tests", I get an error message. Looking at "manage.py sqlclear tests", I get the following output:
BEGIN; DROP TABLE "tests_membership"; DROP TABLE "tests_membership"; DROP TABLE "tests_musician"; DROP TABLE "tests_band"; COMMIT;
This duplication comes from django.core.management.sql.sql_delete, because said function outputs the drop statement for all app models and then for all many-to-many tables. The fix is simple: switch the skip-this-relation condition from checking if the relation is a generic relation to checking the new .creates_table attribute. A patch which does this is attached.