Get list of "mappings from".

        Url parameters
            - unique: if set, return a unique list
            - filter: filter "mappings from"
            - page
            - per_page
            - match_type: s=substring, e=exact, sw=startswith

def get(self, slug):
        """Get list of "mappings from".

        Url parameters
            - unique: if set, return a unique list
            - filter: filter "mappings from"
            - page
            - per_page
            - match_type: s=substring, e=exact, sw=startswith
        """
        kb = api.get_kb_by_slug(slug)

        # check if is accessible from api
        check_knowledge_access(kb)

        parser = reqparse.RequestParser()
        parser.add_argument(
            'unique', type=bool,
            help="The list contains unique names of 'mapping to'")
        parser.add_argument(
            'filter', type=str,
            help="Return only entries where 'from' matches this.")
        parser.add_argument('page', type=int,
                            help="Require a specific page")
        parser.add_argument('per_page', type=int,
                            help="Set how much result per page")
        parser.add_argument('match_type', type=str,
                            help="s=substring, e=exact, sw=startswith")
        args = parser.parse_args()
        return KnwKBMappingsFromResource \
            .search_list(kb, args['filter'],
                         args['match_type'],
                         args['page'], args['per_page'], args['unique'])