Passing Post ID to separate controller from Posts/index.html.erb

开发者_StackOverflow中文版I am trying to allow for voting on posts in a Ruby on Rails blog that I created. I don't really want to go the plugin or gem route because I think I am close. Here is the situation:

I am displaying all my posts in /posts/index.html.erb through the partial _post.html.erb. With each post I am rendering the following code for the vote button:

   <% remote_form_for [@post, Vote.new] do |f| %>
     <%= f.hidden_field :ip_address, :value => "#{request.remote_ip}" %>
     <%= submit_tag 'Me Too', :class => 'voteup' %>
   <% end %>

Which sends the request through the votes controller:

  def create
    @post = Post.find(params[:post_id])
    @vote = @post.votes.create!(params[:vote])


       respond_to do |format|
       format.html { redirect_to @posts}
       format.js
     end
  end

The error I am getting is Couldn't find Post without an ID which makes sense because I am not on the /posts/show.html.erb page.

Is there a way that I can pass the post_id to the votes_controller (and into the post_id column in the votes table) from the /posts/index.html.erb view?

Try adding this in the view, after the remote_form_for :

<%= f.hidden_field :post_id, :value => @post.id %>

You might also need to to this in the def create

@post = Post.find(params[:vote][:post_id]) #note the added [:vote]

If you look at the params after those changes, it should show:

{"vote"=>{"ip_address"=>"127.0.0.1", "post_id"=> >>actual-post-id-here<< },
"commit"=>"Vote Up ↑" ..........

Also, I recommend having a look at the excellent RailsCasts by Ryan Bates. Lots of great video tutorials there.