On Wed, Jul 22, 2009 at 5:52 AM, Margie<margierogin...@yahoo.com> wrote:
>
> I have a situation where I want to do the following:
> take a bunch of POST params and from them create a Q object
> urlencode that Q object and turn it into a GET param, redirect
> using that param
> process the GET that contains the urlencoded Q object, create a
> Q object from it, and use it in a filter
>
>
> I think this should all be possible, however, I am having trouble
> recreating the new Q object from the string representation of the
> original Q object. Here's an example of the problem:
>
>>>> filter_orig = Q(owner__username='mlevine')
>>>> print filter_orig
> (AND: ('owner__username', 'mlevine'))
>>>> filter_new = Q("%s" % orig)
This is the line that looks a bit suspect to me. Firstly - I'm
assuming `orig` should actually be `filter_orig` - in which case...
>>>> print filter_new
> (AND: (AND: ('owner__username', 'mlevine')))
This isn't quite what you think it is. You are reading it as an AND
whose first term is an AND. I suspect what you are actually getting is
an AND clause whose first term is a string that starts "(AND:"
When you construct filter_new, you don't pass in a string - you're
passing in a dictionary of kwargs. The owner__username='mlevine'
syntax is a keyword argument, not a string.
Your original problem descriptions seems to suggest that you think you
will be able to pass a string into Q() and have it interpreted as a
query. This isn't the case - the arguments to Q() are no different to
the arguments to filter(). If you want to serialize a query for use in
a GET request, you'll need to find a different way to serialize your
query.
Yours,
Russ Magee %-)
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