Ruby on Rails

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">
<input type="hidden" value="✓" name="utf8">
<input type="hidden"
value="UFX2eg089kb5Al3qcJXJvJEFYwFnkXCj+dsmXTYLszE="
name="authenticity_token">
<input type="text" name="search_string" id="search_string">
<input type="submit" value="Search" name="commit">
</form>


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!

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