[patch] order_by breaks with a table_prefix and column descending.

[rezzrovv]

If using a table and column from extra()
(i.e. {'select':{'media':'select media from product where ... }})
in order_by(product.-media) and the intended column is to be sorted in descending order, the query_set breaks as ascending/descending is tested prior to determining whether a table_prefix exists.

[rezzrovv]

query.py patch

[anonymous]

duplicate of #2210

the syntax order_by('table.column') was only a hack, correct usage is order_by('foreign_key_field__column'). #2210 has a working patch for it.

[mir@…]

oops, last comment was mine.