Hi, I use scaffold to create the task model controller and view, it contains action as "show", "new", "create", etc. Then, I give an "id" parameters to the view - new.rhtml, so the URL could be like "http://localhost:3000/tasks/new/1" , and I wish when I click the create button in "new.rhtml", the following "create" action could get this id parameter, so I coded like this: ==============def create @task = Comment.new(params[:task]) respond_to do |format| s = params[:id] # I wanna obtain the id parameter here puts ''this is s'' + s ...... ..... ================== However, it gives me the error as : ==================can''t convert nil into String {"commit"=>"Create", "authenticity_token"=>"ae9620b7a5388f218e783889095d1aa4249cfe30", "comment"=>{"author"=>"222", "desc"=>"2", "img_url"=>"2"}} ==================== how can I get the id from "new.rhtml" ''s URL and use it in create action? also attach my new.rhtml ===============<% form_for(@task) do |f| %> <p> <b>Author</b><br /> <%= f.text_field :author %> </p> <p> <b>Desc</b><br /> <%= f.text_area :desc %> </p> <p> <b>Img url</b><br /> <%= f.text_field :img_url %> </p> <p> <%= f.submit "Create" %> </p> <% end %> --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---