According to the Django docs, a new row is created with the new value
primary key when when I change the value of a primary key and save
the object.
In this case, I am looking to change the value. So, I use
force_update=True. Instead of changing the value of the primary key, I
get a DatabaseError. Any ideas of what I am doing incorrectly?
class BuildState(models.Model):
build_state = models.CharField(primary_key=True, max_length=32)
class Meta:
db_table = u'buildstate'
def __unicode__(self):
return "BuildState{'build_state' : '%s'}" %
(self.build_state)
>>> from orm.models import BuildState
>>> foo = BuildState.objects.get(build_state='failed')
>>> foo
<BuildState: BuildState{'build_state' : 'failed'}>
>>> foo.build_state='nirvana'
>>> foo.save(force_update=True)
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/usr/lib/pymodules/python2.6/django/db/models/base.py", line
410, in save
self.save_base(force_insert=force_insert,
force_update=force_update)
File "/usr/lib/pymodules/python2.6/django/db/models/base.py", line
476, in save_base
raise DatabaseError("Forced update did not affect any rows.")
DatabaseError: Forced update did not affect any rows.
>>>
>>>
>>> foo.save()
>>> # This works as expected. A new row is added.
>>>
Thanks,
-Rick
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