Here's the 
solution<http://stackoverflow.com/questions/23601275/web2py-sqlform-url-duplicate-validation/23610186#23610186>!
 
Thanks!


On Sunday, May 11, 2014 11:53:55 PM UTC-5, Sihui Huang wrote:
>
> I want to forbid users being able to submit duplicate urls into the 
> database.
>
> Right now my approach is:
> db.url.URL.requires=[IS_URL(error_message='URL Error'),
>                      IS_NOT_IN_DB(db, 'url.URL',error_message='Dupilcated 
> URL')]
>
> It covers the case for with "http" and without "http". 
> For example, if www.123.com is already in database, then user could not 
> submit http://www.123.com.
> But this approach does NOT cover the case with "https", i.e. the user 
> still could submit https://www.123.com.
>
> Is there anyway to prevent such duplication?
>
> I think eliminating the "http"/"https" ,if any, in urls before calling 
> SQLFORM().process(). In such way, the urls in database are all without 
> "http"/"https". But I don't know how to edit user input before calling 
> SQLFORM().process().
>
> Right now my code is 
> url_form=SQLFORM(db.url).process()
>
> Any ideas?
>
> Thank you!
>

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