Hi,
I've been asking this at django-users but haven't received any good
answer.
(thread:
http://groups.google.com/group/django-users/browse_thread/thread/6994f7b37f3f379c
)
So I looked into the django code and found this:
class ForeignKey(RelatedField, Field):
empty_strings_allowed = False
def __init__(self, to, to_field=None, rel_class=ManyToOneRel,
**kwargs):
# ....
self.db_index = True
and this:
class OneToOneField(ForeignKey):
"""
A OneToOneField is essentially the same as a ForeignKey, with the
exception
that always carries a "unique" constraint with it and the reverse
relation
always returns the object pointed to (since there will only ever
be one),
rather than returning a list.
"""
def __init__(self, to, to_field=None, **kwargs):
kwargs['unique'] = True
super(OneToOneField, self).__init__(to, to_field, OneToOneRel,
**kwargs)
The OneToOneField's comment tells that `unique` is hardcoded, but it
sounds more like a definition, not an explanation WHY it's like that.
So - to implement what I want, I replaced the 2 above lines with code
which makes the same values by default, but allows to do a change,
when a programmer wants it.
Can you tell me if it's a good idea, or I should solve it some other
way (see my original problem:
http://groups.google.com/group/django-users/browse_thread/thread/6994f7b37f3f379c
)?
And another problem: I found that the SQL generated by `manage.py sql`
does create indexes in the database.
For example:
[snip]
ALTER TABLE `forum_forumthread` ADD CONSTRAINT
forum_id_refs_id_3869a6a3 FOREIGN KEY (`forum_id`) REFERENCES
`forum_forum` (`id`);
[/snip]
Such 'foreign key' constraints create indexes in database (at least
mysql). So 'manage.py sqlindexes' is actually redundant, because the
'create index' commands generated by it, only change the names of
indexes. Is this a bug or not?
Regards
MS
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