Hello all,
I've stumbled across a strange problem with some files being deleted when
there's been no call to do so.
The issue comes across during a callback that modifies the
'position_number' field (shown below).
The model setup (for the table in question) is given by:
db.define_table('user_profile_images',
Field('user_id','reference auth_user'),
Field('user_pic',type='upload',autodelete=True),
Field('picture_size',type='float'),
Field('user_pic_thumb',type='upload',autodelete=True),
Field('thumb_size',type='float'),
Field('position_number',type='integer'))
from images import THUMB
db.user_profile_images.user_pic_thumb.compute = lambda row:
THUMB(row.user_pic, 200, 200)
The callback:
@auth.requires_login()
def delete_pic():
to_del = request.args(0,cast=int)
pic = db(db.user_profile_images.id == to_del).select().first()
if pic.user_id == auth.user.id:
db(db.user_profile_images.id == to_del).delete()
re_order = db((db.user_profile_images.user_id == auth.user.id) &
(db.user_profile_images.position_number > pic.position_number)).select()
for img in re_order:
current_position = img.position_number
img.update_record(position_number = current_position - 1)
Every row inside of re_order is having it's thumbnail deleted (physically
removed from the uploads folder) as the loop runs. Aside from the correct
update to current_position, the database is otherwise unchanged and the
main picture (user_pic as described by the model) remains in place.
After playing with things for a while, I noticed that if the update inside
of the for loop is changed to:
for img in re_order:
current_position = img.position_number
img.position_number = current_position - 1
img.update_record()
then everything works as expected, and there is no accidental deletion of
thumbnails.
Why would the initial loop delete the thumbnail, and this modified code run
as expected?
--
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