Bitmask(bitwise operation) support in Ferret

[yaxm]

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/[email protected]/msg00372.html

Thanks.
Yaxm

[yaxm]

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 Y. wrote:

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/[email protected]/msg00372.html

Thanks.
Yaxm

–
http://johnleach.co.uk