查询以将json对象数组插入postgres

我有一张带桌子的桌子fields json[]。我创建了一个将记录插入到该表中的函数，这是调用

select * from add('[{"name":"Yes","value":"yes"},{"name":"No","value":"no"},{"name":"Neutral","value":"neutral"}]') as result;

这是函数本身

CREATE OR REPLACE FUNCTION public.add(
    _fields json[]) RETURNS SETOF json 
LANGUAGE 'plpgsql'
AS $BODY$
     DECLARE
        query text;
    BEGIN
        insert into my_table(fields)
          values(_fields);
        query = 'SELECT json_build_object(''message'', ''Added.'')';
        RETURN QUERY EXECUTE query; 
        END;
$BODY$;

但这表明

malformed array literal: "[{"name":"Yes","value":"yes"},{"name":"No","value":"no"},{"name":"Neutra

然后我尝试了这个

select * from add('{"name":"Yes","value":"yes"},{"name":"No","value":"no"},{"name":"Neutral","value":"neutral"}') as result;

这个插入语句在函数中像

insert into polls(fields) values(array([''||_fields||'']::json[]));

这表明

syntax error at or near "["