basically you got two possibilities:
1. write the value into a session-variable
session[:wtf] = "some string or value"
2. pass your value as a parameter to some action and read params in
your controller:
view:
<%= link_to "my_action" :controller => :bla, :action
=> :my_action, :wtf => "some string or value" %>
controller:
def my_action
puts params[:wtf]
end
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