'Determine if bool query param is \'True\'.
We treat this the same way as we do for policy
enforcement:
{bool_param}=0 is treated as False
Any other value is considered to be equivalent to
True, including the absence of a value'

@classmethod
def query_filter_is_true(cls, filter_value):

    if (isinstance(filter_value, six.string_types) and (filter_value == '0')):
        val = False
    else:
        val = True
    return val
