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Actually the Itensvar[0].save() will issue a database update, the problem is it will call save() on an newly-retrieved-from-the-database object, not the one you retrieved and change the desc on in the previous line. There is no caching done when you access a queryset by indexing like this. If you look at the doc here: http://docs.djangoproject.com/en/dev/topics/db/queries/#limiting-querysets and replace the indexing notation with what its rough equivalent is:
Itensvar[0:1].get().desc = 'Test' Itensvar[0:1].get().save()
you can see the problem. The 2nd line isn't operating on the same object as the first one changed, it's calling save() on a new copy retrieved from the database. You need to write this as:
x = Itensvar[0] x.desc = 'Test' x.save()
| initial | v2 | |
|---|---|---|
| 1 | 1 | Django not update field when I use arrays[] for select object: |
| 2 | 2 | |
| 3 | {{{ | |
| 3 | 4 | Itensvar = Itens.objects.all() |
| 4 | 5 | Itensvar[0].desc = 'Test' |
| … | … | |
| 6 | 7 | |
| 7 | 8 | #django not execute update in database |
| 8 | ||
| 9 | }}} |
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