Ferret talk - Apr 2007 - bitmask(bitwise operation) support in Ferret

Hi,
in my person model,
I have a enumeration field "role" that take bits like 1, 2, 4, 8, 16,
.....
they represent person roles(eg:  admin(1), QA(2), manager(4) .... ).
Each person can take on multiple roles.

say there''s person A that''s both a admin and QA(the role value
is "3")


so if I search like "Person.find_by_content(''role:(1))", I
expect it to
return person A.   but this clearlly doesn''t work.

Does Ferret support this kind of search?

or do I have to build in inverted index as mentioned at
http://www.mail-archive.com/general at lucene.apache.org/msg00372.html

Thanks.
Yaxm

-- 
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Hi Yaxm,

I''m not sure about bitwise search operations, but you can index the
return value of methods, as well as ActiveRecord attributes.

You could write a method called "role_text" that returns a string
according to the value of role: "admin manager", and index that.  Then
you can search: ''role_text:admin'' and get all the admins.

Just make sure that the strings you use don''t get tokenized ambiguously
(this depends on your analyzer I guess).

Hope this is useful.

John.

On Tue, 2007-04-24 at 07:42 +0200, Yaxm Yaxm wrote:
> Hi,
> in my person model,
> I have a enumeration field "role" that take bits like 1, 2, 4, 8,
16,
> .....
> they represent person roles(eg:  admin(1), QA(2), manager(4) .... ).
> Each person can take on multiple roles.
> 
> say there''s person A that''s both a admin and QA(the role
value is "3")
> 
> 
> so if I search like "Person.find_by_content(''role:(1))",
I expect it to
> return person A.   but this clearlly doesn''t work.
> 
> Does Ferret support this kind of search?
> 
> or do I have to build in inverted index as mentioned at
> http://www.mail-archive.com/general at lucene.apache.org/msg00372.html
> 
> Thanks.
> Yaxm
> 
-- 
http://johnleach.co.uk