Magic variable: params and :id

Rails
1

I enabled this line in route.rb

match ':controller(/:action(/:id))(.:format)'

The HTML generated by erb is like this:

<form method="post" action="/client_workouts/find"

accept-charset=“UTF-8”>



In the controller, it looks like this:

def find
  puts params[:search_string]
end

When I input some text in the text_field and click Search, the find
function can print out the value of that text.

This looks magic to me. Because in the route, the variable name is
id, but in the controller, this variable can be used by params. I
was wondering whether id is a magic variable that maps to param.

Does anyone have ideas about this. Thanks!

2

On Nov 28, 2012, at 10:46 AM, Hanfei S. wrote:

value=“UFX2eg089kb5Al3qcJXJvJEFYwFnkXCj+dsmXTYLszE=”
puts params[:search_string]

Does anyone have ideas about this. Thanks!

In the controller, every parameter that was gleaned from the routing
process is available in the params hash. This includes anything that was
named in the route that matched the request, and POST or querystring
(GET) variables. The only parts of the request that are not in that hash
are the session and cookie parameters.

This gives you a one-stop-shop for any parameter you need, without
having to specify in great detail precisely where you might have
expected to find that parameter.

Walter