i'm trying to figure out how to implement sorting into the DataGrid using 
MongoDB with ming.

Basically i took the example in the DataGrid documentation and tried to 
change it for Ming. 

ordering = kw.get('ordercol')

if ordering and ordering[0] == '+':
    places = places.sort(ordering[1:], ming.DESCENDING) # Descending

elif ordering and ordering[0] == '-':
    places = places.sort(ordering[1:], ming.ASCENDING) # Ascending

But for some reason it doesn't work. It crashes with the following error 

TypeError: must use keyword argument for key function

I also tried to enter the keyword instead of "ordering[1:]", but i get the 
same error. Any idea what's wrong?

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