html - Rails: Form_for: No route matches {:action=>"show", :controller=>"posts"} missing required keys: [:id] -

i new ror , trying build simple blog, got stuck @ "adding post" function.

the following error message pops when load .../posts/new:

no route matches {:action=>"show", :controller=>"posts"} missing required keys: [:id] 

here posts controller looks this:

class postscontroller < applicationcontroller def index  end  def new  end  def create      render plain: params[:post].inspect end 

end

here new.html.erb looks this:

<h1>add post</h1> <%= form_for :post, url: posts_path |f| %> <p>     <%= f.label :title %><br>     <%= f.text_field :title %> </p>  <p>     <%= f.label :body %><br>     <%= f.text_area :body %> </p>  <p>     <%= f.submit %> </p> <% end %> 

i had set posts resource in routes. surprising thing is, on friend's laptop, code works.

i happy advice, , apologize silly question.

the form_for helper looking resource object operate with, , you're giving symbol. suspect it's assuming that's action url instead, , translating (or trying to) symbol route.

using form_for in new action, pattern create new resource , feed form_for helper:

def new   @post = post.new end 

<%= form_for @post, url: posts_path |f| %>   ... <% end %>