Dynamic insert into ARRAY? plpgsql

Hey Guys,

I have a table(Orders_object_table) of this type:

CREATE TYPE orders_type AS
(orderid integer,
amount amount_type,
customerid integer,
orderdate date,
orderlines orderlines_type[]);

and I am trying to insert data from another tables(Orders and Orderlines).
Each Order has many Orderlines but I dont know the number.

I use this :

CREATE OR REPLACE FUNCTION Copy_Orders_Data() RETURNS integer as $BODY$
BEGIN

INSERT INTO "Orders_object_table" (...,orderlines,...)
SELECT ...,ARRAY[row(ol."OrderlineId", ol."Quantity",
ol."Prod_id")::orderlines_type], ...
FROM "Orders" o
INNER JOIN "Orderlines" ol
ON o."OrderId" = ol."OrderId"
WHERE o."OrderId" >=1 AND o."OrderId" <=12000;
END;

but it gives me an error. (IT tries to create many rows for each Order which
returns duplicate PK OrderId)

How can I find how many orderlines have each row, and then insert them in
one row? Each row of the Orders_object_table must have a unique PK OrderId ,
and a column with all the Orderlines this Order has.

Thank you in advance :)

Kind Regards,
George Ant

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