Rails - Aug 2006 - how do i pass/save a selected param ID to different views?

hi,

i have a link called ''family doctor''.

when the user presses the ''family doctor'' link, it goes
through town''s
DB and searches in which towns where there is a family doctor. after 
this is done, the view displays all the towns with the total number of 
''family doctors'' in each town.

next i want the user to select the town that they are interested in and 
display all the doctors information in that town in a new view.


brief algorithm:

*user selects doctor type

select from all towns where doctor type == family doctor.
add up the amount of family doctors in each town

new view-
display all towns where there is a family doctor with the amount of 
family doctors in each town

*user selects town

select from town where town == town selected and where doctor type == 
family doctor.


i guess i am wondering how to keep family doctor as the doctor type 
through this whole process. will i need to use session information? and 
for the last step, how do i pass the town and doctor type to the next 
function?


thanks for any help/suggestions.



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