[web2py] service.json request.args in query

[Richard]

Hi,

I want to show pictures belonging to a certain city. In the latter example 
The data send includes as 3rd element 'Bangkok'. I can't use this 
 request.args[2] not is the selection. Plain 'Bangkok' in stead 
of request.args[2] in the selection gives the wanted pictures.

What is wrong?

VIEW:
get_images('Bangkok')

function get_images(data){
      console.log('data sent');
      console.log(data)
     $.getJSON(' {{=URL('call', args=['json', 'images_ws', 'Bangkok'] )}}', 
function(data){
      console.log('data back');
      console.log(data);      
      update(data)
     })
}

CONTROLLER:
@service.json
def images_ws():
    requested_loc = request.args[2]
    loc = db(db.loc.name==requested_loc).select()[0]
    pictures = db(db.image.loc==loc.id).select().as_list()
    return pictures

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