Hello!

I am trying to enable temporary access for users to downloadable files by 
requesting access on a per file basis  

In my database.


Field('members', 'list:reference db.auth_user', default=auth.user_id, 
requires=IS_IN_DB(db, db.auth_user, '%(first_name)s %(last_name)s 
%(email)s', multiple=(1, 1000)), writable=False, readable=False),

...


db.personal_uploads.file_upload.authorize = lambda record: 
auth.is_logged_in() and (record.members.contains(auth.user_id))

Causes the following error when trying to download the file:

Traceback (most recent call last):
  File "/home/www-data/web2py/gluon/restricted.py", line 220, in restricted
    exec ccode in environment
  File "/home/www-data/web2py/applications/cryaboutit/controllers/default.py" 
<https://62.75.246.181/admin/edit/cryaboutit/controllers/default.py>, line 328, 
in <module>
  File "/home/www-data/web2py/gluon/globals.py", line 385, in <lambda>
    self._caller = lambda f: f()
  File "/home/www-data/web2py/gluon/cache.py", line 523, in wrapped_f
    rtn = func()
  File "/home/www-data/web2py/applications/cryaboutit/controllers/default.py" 
<https://62.75.246.181/admin/edit/cryaboutit/controllers/default.py>, line 298, 
in download
    return response.download(request, db)
  File "/home/www-data/web2py/gluon/globals.py", line 601, in download
    (filename, stream) = field.retrieve(name,nameonly=True)
  File "/home/www-data/web2py/gluon/dal.py", line 10029, in retrieve
    if self.authorize and not self.authorize(row):
  File "/home/www-data/web2py/applications/cryaboutit/models/db.py" 
<https://62.75.246.181/admin/edit/cryaboutit/models/db.py>, line 138, in 
<lambda>
    db.personal_uploads.file_upload.authorize = lambda record: 
auth.is_logged_in() and (record.members.contains(auth.user_id))
AttributeError: 'list' object has no attribute 'contains'



Thank you for any advice offered. 

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