db.alter_column() cannot change default value in MySQL

[fcamel@…]

Here is my server information:

• mysql 5.0.51a
• ubuntu 8.04

Using db.alter_column() to change the default value works in sqlite3 but fails in MySQL.

models.py:

class Name(models.Model):
    n = models.IntegerField(default=3)

Part of the migration script:

class Migration(SchemaMigration):

    def forwards(self, orm):
        db.alter_column('my_app_name', 'n', models.IntegerField(default=40))


    def backwards(self, orm):
        db.alter_column('my_app_name', 'n', models.IntegerField(default=3))

After running "migrate" (forward or backward), the default value is changed to None.