>
> Pardon me for asking stupid question, what does SQLFORM.smartgrid(.....，
> args=request.args[:1], ...) really do? you mentioned in earlier post that
> args must be a list, and it preserves the 1st argument of URL for
> application specific use. Does it tell web2py whatever url it creates, it
> should always preserve the same URL up to the 1st argument (for this case)
> eg. http://localhost/tests/default/view_invoices/2?
>
The grid builds its own internal URLs by taking the base URL of the action
that serves the grid and adding URL args. If you specify the "args"
parameter, it will first add any args from that to the URL before adding
any of its own args, thus preserving any args you are using for non-grid
purposes.
> I looked up the documentation, there is little info about args in grid /
> smartgrid signature. If above assumption is correct, if my applications
> uses first 2 args for specific application purpose, i should modify the
> code to SQLFORM.smartgrid(.....， args=request.args[:2], ...)?
>
Correct.
> Another stupid question - what's difference between request.args[:1] and
> request.args(0)?
>
The former produces a list (even if it contains zero items or one item),
whereas the latter returns an individual value.
def view_invoices():
> customer_id = request.args(0)
> if customer_id:
>
This is not a helpful conditional because once you click on any link
produced by the grid, there will always be some value for request.args(0)
(because the grid will have added some URL args to the URLs it generates).
One option is something like:
customer_id = request.args(0, cast=int, otherwise=lambda: None)
if customer_id is not None:
The above will attempt to cast the first URL arg to an int and return None
otherwise. The grid doesn't use ints as the first URL arg, so if the above
returns None, that means there is no URL arg or it is not an int, which
implies that no customer_id has been specified.
Anthony
--
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- 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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