ruby on rails - Error: First argument in form cannot contain nil or be empty -

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i having issues form_for, keep getting error

first argument in form cannot contain nil or empty

this form

           <%= form_for @blog |f| %>             <%= f.text_area :blogpost %>             <%= f.submit  'add blog'%>              <% end %>

this controller 

 class blogscontroller < applicationcontroller    def index     @blogs = blog.all  #.paginate(page: params[:page], per_page: 5)    end    def create   @blog = blog.create(blog_params)   redirect_to root_path, notice: "created blog"   end   def update   @blog = blog.create(blog_params)   redirect_to root_path   end  def show   @blog = blog.find(params[:id])   end   def new  @blog = blog.new  end   def edit  @blog = blog.find(params[:id])  end  def destroy  @blog = blog.find(params[:id])   @blog.destroy  redirect_to root_path end  private  def blog_params    params.require(:blog).permit(:blogpost)  end  end

how fix this?

as belongs index.html.erb,you should adding line @blog = blog.new index method.

def index @blogs = blog.all   @blog = blog.new end

and update method wrong.it should avoid getting error in future.

def update   @blog = blog.update(blog_params)   redirect_to root_path   end

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