filters = ()

            if len(filterConditions):
                binding_callback = None
                for filter in filterConditons:
                    binding = filter['binding']
                    operator = filter['op']
                    field = getattr(TChartAttributes, filter['fieldId'].lower(), None)
                    value = filter['value']

                    if op == '=':
                        f = (field == value, )
                    elif op == '<>':
                        f = (field != value, )

                    if binding_callback is None:
                        filters += f
                    else:
                        filters += (binding_callback(f), )

                    if binding = 'and':
                        binding_callback = and_
                    else:
                        binding_callback = or_