The cascading delete is handled by the database, so the web2py DAL is not
executing the delete from the db.allegato table and therefore doesn't have
the opportunity to run the _before_delete and _after_delete callbacks (the
former is used to autodelete uploaded files).
I suppose you could create a _before_delete callback on the db.prodotto
table that does the file deleting. Maybe we could build this in to the
default _before_delete callbacks for tables -- it would check the
_referenced_by fields for ondelete='CASCADE', then check the referring
table for upload fields with autodelete=True, and then delete the
associated files (or maybe just run the _before_delete callback of the
referring table). You can post an issue on Google Code and reference this
thread.
In the documentation, we should probably note that the _before_delete and
_after_delete callbacks of a table will not be run when the delete happens
in the database as the result of a cascade.
Anthony
On Wednesday, January 15, 2014 4:26:47 AM UTC-5, maurizio wrote:
>
> Hi all,
> probably due to my incompetence I have the following problem,
> Thank's in advance anyone who wants to help me.
>
> consider the following code:
>
> '''
> db.define_table('prodotto',
> Field('nome'),
> format='%(nome)s',
> plural='prodotti')
>
> db.define_table('allegato',
> Field('descrizione',requires=IS_NOT_EMPTY()),
> Field('documento','upload',autodelete=True),
> Field('prodotto','reference
> prodotto',writable=False,readable=False),
> format='%(descrizione)s',
> plural='allegati')
>
> def index():
> grid = SQLFORM.smartgrid(db.prodotto,
> deletable=True,
> editable=True,
> create=True,
> csv=False)
> return dict(grid=grid)
>
> web2py 2.7.4-stable+timestamp.2013.10.14.15.16.29
> (Running on Rocket 1.2.6, Python 2.7.3) Debian 7.2 (wheezy)
> '''
>
> Deleting a record from the "allegato" table, also delete the corresponding
> file (autodelete=True) in the default /uploads folder.
> Deleting a record from the "prodotto" master table, also delete all
> records in the "allegato" detail table (CASCADE delete), but files in the
> folder uploads are not erased.
>
> Any idea?
>
> thanks again
> Maurizio
>
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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