from marshmallow import post_dump


class ListParamsMixin:
    """List params to name-value params."""

    @post_dump
    def data_to_list(self, data, *args, **kwargs):
        params_list = []
        for k, v in data.items():
            if v and isinstance(v, list):
                params_list.extend([(k, vi) for vi in v])
            elif isinstance(v, bool):
                params_list.append((k, str(v).lower()))
            else:
                params_list.append((k, v))
        return params_list