search across models

Hi all, I am trying to implement the search across models. But i could not able to do this.

let me tell you my application details:

i have tables like:

1)containerformats : contains the streamnames

2)transportstreams : have how many programs are there in each stream of containerformattable and has containerformat_id as one column

3)programs: have how many video and audio streams are there in each program and has transportstream_id as one column

4)streams : which will have the video and audio stream parametes and it has all other table ids like: transportstream_id containerformat_id program_id

and i have association like:

containerformats has_many:transportstreams transportstreams has_many:programs programs has_many:streams streams belongs_to :all above tables

I have cretaed a search controller to implement the search: now here my sample querie i want to implement in my search controller.

find streams from containerformats has number of programs = 1(which is from transportstreams table) and nummberof videos =1 (which is from programs table) and resolution ="720x480"(which is from streams table)

the above query i could able to write and test in mysql prompt. But if i try to implement this i could not able to do this. Can you suggest me how exactly the code looks like to search the data from a table based on other table parametrs selected?

suggest me if iam doing any mistake while assigning associatioons.

Any help would be appreciated.

thanks Srikanth