i needed to serialize some values from descriptors so i modified few things
and added "descriptors" argument.
it works like this:

serialize("json", (somemodel,), ensure_ascii=False, relations={
  'users':{
    'fields':('date_joined',),
    'extras':('get_full_name',),
    'descriptors':{
      'mymodel_count':('mymodel_set.count',),
      'mymodel_instance_method':('mymodel_set.all.0.method_with_args', 55),
      #'mymodel_model':('mymodel_set.all.0',),
      #'mymodel_qs':('mymodel_set.all',),
    }
}})

format for descriptor field is "field":arguments where first item in
arguments is object value path.
if len(arguments) > 1 callable will be called with arguments[1:]

this is quick and dirty hack that works ok for my current problem but i was
wondering if you plan to add something similar to this project or suggest a
better way to access descriptors data?

attached file is svn diff.

wadofstuff_descriptors.txt 4.5 KB   Download