ruby on rails - Form_for "First argument in form cannot contain nil or be empty" error -

i cannot figure out why i'm getting error, , means.

first argument in form cannot contain nil or empty(line 3)

add new post

<%= form_for @post |f| %>  //error here <p>     <%= f.label :title, 'title' %><br/>     <%= f.text_field :title %><br/> </p> <p>     <%= f.label :content, 'content'%><br/>     <%= f.text_area :content %><br/> </p> <p>     <%= f.submit "add new post" %> </p> <% end %> 

controller:

class postscontroller < applicationcontroller     def index         @posts = post.all     end      def show         @post = post.find(params[:id])     end      def new         @post = post.new     end      def create         @post = post.new(params[:post])          if @post.save             redirect_to posts_path,  :notice => "your post saved"         else             render "new"         end     end      def edit      end      def update      end      def destroy      end end 

assuming rendering postscontroller , using conventional view name, new method should create new post , assign it:

def new   @post = post.new end 

you can use class name (as @yuriy suggested), conventional way instantiate new object. allows re-use same form view rendering errors after save.

if want see how looks, create new rails project , use scaffold generator create sample code.