Specifically, maybe something like this:
db.define_table('image',
Field('file', 'upload', represent=lambda v, r: A(generate_image(v),
_href=URL('default', 'download', args=v, vars=dict(action=
'update_download_number', id=r.id)))),
Field('downloads', 'integer', default=0, writable=False))
def download():
if request.vars.action == 'update_download_number':
db.image(request.vars.id).update_record(downloads=db.image.downloads
+ 1)
return response.download(request, db)
Anthony
On Wednesday, March 27, 2013 5:46:28 PM UTC-4, Anthony wrote:
>
> What do you mean by absolute vs. relative URLs in this case, and why does
> that matter (i.e., show examples)? The URL function can generate absolute
> URLs <http://web2py.com/books/default/chapter/29/04#Absolute-urls> by
> specifying the scheme and host arguments, but it's not clear why you would
> need that in this case. Note, if your URL includes args or vars used to
> identify a specific record, then you can access the record identifier via
> request.args or request.vars within the function called by the URL.
>
> Anthony
>
> On Wednesday, March 27, 2013 4:59:02 PM UTC-4, Lamps902 wrote:
>>
>> In the case that I'm dealing with, the image is incidental to the
>> problem. But let's say there is an image, and a relative URL (i.e. file
>> download); you can do something like this:
>>
>> db.my_db.file.represent = lambda x,y: \
>> A(generate_image(y.file),
>> _href=URL(args=["my_db/download", x],vars =
>> dict(action="update_download_number", id=y.id)))
>>
>> Can't do this for absolute links. Maybe I'm misunderstanding your
>> suggestion, but the same image generator function will be invoked for all
>> of the rows in the table, so if I use that, all the rows end up being
>> updated, as opposed to the one which should be updated. So basically, I
>> think it comes down to how to go about creating a function that's invoked
>> when an absolute link is clicked, and passing an identifier related
>> specifically to that link to the function.
>>
>> On Wednesday, March 27, 2013 2:41:16 PM UTC-5, Niphlod wrote:
>>>
>>> so, you have an url (i.e. a string) that needs to return an image.
>>> you should have a controller that, when that URI is matched, returns the
>>> image after increasing its number_visited value.... seems pretty standard
>>> to me....
>>>
>>> On Wednesday, March 27, 2013 7:15:12 PM UTC+1, Lamps902 wrote:
>>>>
>>>> Let's say you have an SQL grid generated from a db with field *my_url*,
>>>> which stores the value of an absolute URL, and has a representation
>>>> defined
>>>> in this way:
>>>>
>>>> db.my_db.my_url.represent = lambda the_url, row:
>>>> A(generate_link_image(), _href=the_url, _target='_blank')
>>>>
>>>> What would be a good way to modify the above code so that when the link
>>>> is clicked, some field in *my_db* (for example, *number_visited*,
>>>> corresponding to the number of times the url has been clicked) is updated?
>>>> I'm not sure you can use _href=URL(...) with absolute links, and other
>>>> variants I've tried end up updating every record referenced in the table
>>>> rather than just the one that the user clicks. Thanks.
>>>>
>>>
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