Err in Documentation

You forgot to update Strong params in section 6.4 (deleting comments) http://guides.rubyonrails.org/getting_started.html

This is your final code:

class CommentsController < ApplicationController

``def create

``@post = Post.find(params[``:post_id``])

``@comment = ``@post``.comments.create(params[``:comment``])

``redirect_to post_path(``@post``)

``end

``def destroy

``@post = Post.find(params[``:post_id``])

``@comment = ``@post``.comments.find(params[``:id``])

``@comment``.destroy

``redirect_to post_path(``@post``)

``end

end

It should be:

class CommentsController < ApplicationController

``def create

``@post = Post.find(params[``:post_id``])

@comment = @post.comments.create(params[:comment].permit(:commenter, :body))

``redirect_to post_path(``@post``)

``end

``def destroy

``@post = Post.find(params[``:post_id``])

``@comment = ``@post``.comments.find(params[``:id``])

``@comment``.destroy

``redirect_to post_path(``@post``)

``end

end