[Zope] modifying a url's query string

[Tino Wildenhain]

Hi Mark,

Roach, Mark R. wrote:
> Hi, I'm wondering if there is a good way to modify the query string of a
> get request to change a single variable. For example, let's say my dtml
> method is accessed like this:
> 
> http://myzope/MyFolder/method?var1=foo&var2=bar
> 
> now I want one of the links on the page to load the same page, only with
> a different value for var2.
> 
> I could use something like 
> <dtml-var absolute_url>?var1=&dtml-var1;&var2=newvalue
> 
> but that seems cumbersome the longer the list of variables gets.
> 

...
> 
> full_url_with_query({'var1':'newvalue'})

This is ZTUtils.make_query().

> 
>  but it seems that the only source of variable info is the (quite large)
> REQUEST object. Is there any way to pull only the query string variables

yes, this is the subobject "form" of REQUEST.


> out of the request, or even better, a function that does what my
> imaginary "full_url_with_query" function wants to do?

Ok, some examples, requiring you do it inside a python script "Script 
(Python)" as you would do anyway for logic:

# simple copy:
from ZTUtils import make_query
form = container.REQUEST.form

return apply(make_query,(),form)

# copy with replacement:

from ZTUtils import make_query
form = container.REQUEST.form

form.update({'value1':'somevalue',
              'value2':'othervalue'})

return apply(make_query,(),form)

# copy with defaults:

from ZTUtils import make_query
form = container.REQUEST.form

defauls = {'value1':'somevalue',
            'value2':'othervalue'}

defaults.update(form)

return apply(make_query,(),form)

# the most simple variable only:
from ZTUtils import make_query

return make_query(value1=1234,value2='foobar',value3=[1,2,3])
# this also shows how different types are handled.

HTH
Tino