import json


def format_genre(**kwargs):
    """Format a subgenre for release correction."""
    return json.dumps(kwargs['swb_value'] or '')


def format_subgenre(**kwargs):
    """Format a subgenre for release correction."""
    return json.dumps([kwargs['swb_value']])


FIELD_FORMATTERS = {
    'genreId': format_genre,
    'subgenreId': format_subgenre
}