def read_bytes_from_field_file(field_file):
    """
    Returns the bytes read from a FieldFile

    :param ~django.db.models.fields.files.FieldFile field_file:
    :return bytes: bytes read from the given field_file
    """
    try:
        field_file.open()
        result = field_file.read()
    finally:
        field_file.close()
    return result