Boolean to int

Hi,
       I'd like to get 1 or 0 from a select on a boolean field.

How could I do ?

I tried the following rule, which I can't insert :

CREATE FUNCTION bool_to_int( boolean ) RETURNS integer AS '       DECLARE               my_bool ALIAS FOR $1 ;
BEGIN              -- Retourne 1 si true, 0 si false               IF my_bool IS FALSE THEN
RETURN0 ;               ELSIF my_bool IS TRUE THEN                               RETURN 1 ;               ELSE RETURN
-1;               END IF ;       END ; 
' LANGUAGE 'plpgsql';

CREATE RULE boolean_return AS ON SELECT TO DOCUMENT DO INSTEAD       SELECT        document_id,       workflow_id,
type_document_id,       image_id,       theme_id,       document_version,       document_surtitre,
document_titre,      document_chapeau,       document_synthese,       document_corps,       document_pdf,
document_date_creation,      document_mot_clef,       (bool_to_int(document_online)) as document_online,
bool_to_int(document_valid)as document_valid FROM document; 


psql:cnambo_proc_stock.sql:69: ERROR:  select rule's target entry 15has different type from attribute document_online

Who could help me ?

S@S

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