Recursive CTE in function problem

[Doug Kyle <dkyle@xxxxxxxx>]

Postgres 9.4.1, with these tables:

grpl_collection.collections
 id     | integer |
 name   | text    |
 parent | bigint  |
(An adjacency list representing a collections hierarchy)

grpl_collection.collections_copy_map
 id         | integer |
 collection | bigint  |
 copy       | bigint  |
(map a copy to the collections it belongs to)

This query correctly answers if a copy is in a collection tree:

 select 3006377 in (select copy from 
grpl_collection.collections_copy_map where copy=3006377 and collection in
(WITH    RECURSIVE
        q AS
        (
        SELECT  c.id
        FROM    grpl_collection.collections c
        WHERE   name=$$Movies$$
        UNION ALL
        SELECT  cn.id
        FROM    q
        JOIN    grpl_collection.collections cn
        ON      cn.parent = q.id
        )
SELECT  id
FROM    q));


But when I use it as a function it always returns false:

CREATE OR REPLACE FUNCTION grpl_collection.copy_in_collection_name(cpid 
bigint, colname text)
 RETURNS boolean
 LANGUAGE plpgsql
AS $function$
BEGIN
    RETURN cpid in (select copy from 
grpl_collection.collections_copy_map where copy=cpid and collection in
(WITH    RECURSIVE
        q AS
        (
        SELECT  c.id
        FROM    grpl_collection.collections c
        WHERE   name=$$colname$$
        UNION
        SELECT  cn.id
        FROM    q
        JOIN    grpl_collection.collections cn
        ON      cn.parent = q.id
        )
SELECT id FROM q ));
END;
$function$

What am I missing?


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