Question

I have a simple system in which photos have many comments.
I’m sure I’m not doing this right, but I am trying to build a simple rating system for the comments. comment.rating starts at 0 and can go up.

This is a portion of my Comments controller

class CommentsController < ApplicationController

  def increment
    @comment = Comment.find(params[:id])
    @comment.rating += 1
    redirect_to(@photo)
  end

end

I think the increment method is fine, but how I’m calling it is not:

<%= link_to "+", :controller => 'comments', :method => 'increment' %>

That doesn’t work. I realize this is a bit of a fundamental question, but I’d appreciate any advice. Thanks.

Answer 1

I believe you are not passing a comment :id to params.

You could do so by defining a route like this in your routes.rb file:

match 'increment_rating/:comment_id' => 'Comments#increment', :as => 'increment_rating'

with your increment action now beginning with

def increment
    @comment = Comment.find(params[:comment_id])
    ...
end

and then call it from the view with

<%= link_to '+', increment_rating_path(comment.id) %>

where comment.id gives the id of the comment whose rating you want to increment