Rails - Aug 2014 - Creating my first blog with ruby on rails

I am trying to create my first ever program Using Ruby programming
language on Ruby on Rails and it is a blog! I am following a tutorial
and have created a comments box which does NOT print the comment on the
page so far when written in the comments box, that's the problem. I will
explain step by step I have:

1. Called out on routes.rb:

resources :posts do
resources :comments
end

2. Called out using Cmder:
rails g controller comments create destroy


3. This is my comments_controller.rb class:

class CommentsController < ApplicationController
  def create
    @post = Post.find(params[:post_id])
    @comment = @post.comments.build(params[:comment]) #around here is
the error
    @comment.save

    redirect_to @post
  end

  def destroy
  end
end



can anybody please help?

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