Re: potential bug in JSON

On 05/28/2013 11:38 AM, Szymon Guz wrote:
> I've found a potential bug. Why the "->" operator returns JSON instead
> of TEXT? It doesn't make sens for me, and the documentation doesn't
> inform about that.
>
> postgres=# SELECT ('{"id": 1}'::json -> 'id')::int;
> ERROR: cannot cast type json to integer
> LINE 1: SELECT ('{"id": 1}'::json -> 'id')::int;
>
> postgres=# SELECT ('{"id": 1}'::json -> 'id')::text::int;
> int4
> ------
> 1
> (1 row)
>
>
>

This is not a bug. It is documented and by design.

If you want text, use the ->> operator. That's exactly what it's for.

cheers

andrew