sql sequence reset ignores through meta-data for ManyToMany relations

[phaesler]

The sql sequence reset code in django.core.management ignores any "through" table meta-data on ManyToMany relations. In particular, it assumes that the primary key column of the many-to-many join table is called "id", even if a "through" Model is given that declares a primary key column with a different name.

This affects at least the postgresql and oracle backends:

db/backends/oracle/base.py:186

and

db/backends/postgresql/operations.py:130

Both explicitly set the primary key column name to "id".

[Cliff Dyer]

Duplicate of #11107. Thanks for pointing out the Oracle issue. I'm adding it to the patch on the other ticket.

Cheers,
Cliff