Passing a parameter from a view to a different controller

I am new to Rails and have a simple problem where I am trying to pass
a parameter from a view to another controller outside the scope...The
model is about a Customer having multiple Prescriptions. The GET
request is : /prescription/list_per_customer/2

This is from the view of Customers :

<%= link_to "Customers Prescription", :action =>
"list_per_customer", :controller => "prescription", :id => @customer.id
%>

This is from the other controller, PrescriptionController :

def index
    @referred_customer=params[:id]
end
def list_per_customer
     @cust_prescriptions =
Prescription.find_all_by_customer_id(@referred_customer)
     redirect_to :action => 'list_per_customer'
end

How can this be done with or without sessions ? Will appreciate very
much if the complete code is provided for these two parts of the code
in Customer->view.rhtml and Prescription->list_per_customer...thx

I am new to Rails and have a simple problem where I am trying to pass
a parameter from a view to another controller outside the scope...The
model is about a Customer having multiple Prescriptions. The GET
request is : /prescription/list_per_customer/2

There's really not any difference between a link that will be routed
to the same controller and one that won't.

This is from the view of Customers :

<%= link_to "Customers Prescription", :action =>
"list_per_customer", :controller => "prescription", :id => @customer.id
%>

This is fine as long as their is a route backing this (the default one
will do if it exists)

This is from the other controller, PrescriptionController :

def index
@referred_customer=params[:id]
end
def list_per_customer
@cust_prescriptions =
Prescription.find_all_by_customer_id(@referred_customer)
redirect_to :action => 'list_per_customer'
end

You haven't said what isn't working, but at the very least you need to
assign params[:id] to @referred_customer (although personally I find
that a bit misleading - it makes it sound like @referred_customer is a
customer object rather than just an id) and I doubt you want to
redirect - presumably you have a list_by_customer template that knows
how to display the prescriptions.
If you're new I'd also try using more of the rails conventions (eg
make prescriptions a nested resource (see the routing guide on
guides.rubyonrails.org for more info)

Fred

Thanks a lot, there was a problem in the list_per_customer template…it works now.