add_column with keep_default doesn't work for ForeignKeys

[nick]

keep_default needs to handle name => name_id conversion for foreign key columns. At the moment, it breaks with something like:

db.add_column('info_tip', 'cost', models.ForeignKey?(TipCost?, default=1), keep_default=False)

ALTER TABLE [info_tip] ADD [cost_id] int NOT NULL DEFAULT 1; []

ALTER TABLE [info_tip] ALTER COLUMN [cost] int; []

[andrew]

Fixed in [120].