On 10/02/13 15:07, Bill Freeman wrote:
Did you previously have a field named 'title' in this model that was
marked unique, that you have since removed? If so, the column may still
be in the database with a unique constraint. Since it's no longer in
the model, some default may be being used when you save, and that's
obviously not unique. Use suitable tools for your database (if
PostgreSQL, I suggest PGAdminIII) to examine the schema. You may be
able to drop the column, or at least the constraint (back up the
database first).
If there never was such a field, then the problem originates in another
model. You still may be able to figure it out by inspecting the
database schema. You can also temporarily set up to catch the Integrity
Error close to the origin, and call pdb.set_trace(), where you can
examine the query to see what models are involved.
Bill
OK, I've just found something rather strange. If I just do a simple:
tag = BlogTag(title=form.cleaned_data['title'],
description=form.cleaned_data['description'],
num_articles=0)
tag.save()
I get an IntegrityError and the model fails to save. On the other hand
if I do the following:
try:
tag = BlogTag(title=form.cleaned_data['title'],
description=form.cleaned_data['description'],
num_articles=0)
tag.save()
except Exception:
pass
the model saves correctly (I've checked manually in the SQLite database)
and there is no error shown at all (as expected since I have ignored the
exception).
Any idea why this is the case? If it truly were a database constraint
violation I would have assumed that it would fail to save no matter what
you did regarding Python exceptions.
This feels like a bug in Django to me.
Suggestions welcome.
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