Rails 4 how to create and listing in the same page -

i have model product , want create , list under text_field

in controller

class productcontroller < applicationcontroller def buy     @product = product.new(product_params)          respond_to |format|             if @product.save                 format.html { redirect_to @product, notice: 'product added.'}             else                 format.html { redirect_to @product, notice: 'failed added.'}             end         end     end      private      def product_params         params.permit(:name, :description)     end 

end

and view

<%= simple_form_for @product, :url => { :controller => 'product', :action => 'buy'} |f| %> <%= f.input :name %> <%= f.input :description %> <%= f.button :label => 'buy', :class => 'btn add-product btn-primary' %>  <% end %> 

and try list in same view

        <% @products.each |product| %>         <%= product.name %>         <%= product.description %> 

and script

<script>  $('.add-product').click(function(){   $('.product').clone().first().appendto('.container');  }) 

i'm not sure code can run or not cuz got problem

undefined method `model_name' nilclass:class

in <%= simple_form_for @product, :url => { :controller => 'product', :action => 'buy'} |f| %>

my question append form partial in new view of same model in rails can't use %input{:name => "model[][name]"} input

can me how fix code thanks~

@pruduct typo. make @product. fix it?

based on comments.

class productcontroller < applicationcontroller     def index     @products = product.all      @product = produc.new   end     def buy     @product = product.new(product_params)     respond_to |format|       if @product.save         format.html { redirect_to products_path, notice: 'product added.'}       else         format.html            @products = product.all           flash.now[:error] = 'failed add product'           render action: 'index'         end       end     end   end end 

had change redirect on failed since if didn't save won't have id, , won't able redirect it.

then in index.html.erb view

<%= simple_form_for @product, :url => { :controller => 'product', :action => 'buy'} |f| %>   <%= f.input :name %>   <%= f.input :description %>   <%= f.button :label => 'buy', :class => 'btn add-product btn-primary' %> <% end %>  <% @products.each |product| %>   <%= product.name %>   <%= product.description %> <% end %> 

i think should asking.