DRY Controller (debate)

Before Refactor

class PostsController < Applicationcontroller
  def index
    @posts = Post.all
  end

  def show
    @post = Post.find(params[:id])
  end

  def new
    @post = Post.new
  end

  def create
    @post.create(params[:post])
    redirect_to post_path(@post)
  end

  def edit
    @post = Post.find(params[:id])
  end

  def update
    @post = Post.find(params[:id])
    @post.update_attributes(params[:post])
    redirect_to post_path(@post)
  end

  def destroy
    @post = Post.find(params[:id])
    @post.destroy
    redirect_to posts_path
  end
end

For CRUD resources, you always write the 7 actions with duplicated codes.

After Refactor

class PostsController < InheritedResources::Base
  # magic!! nothing here!
end

Using inherited_resources gem, you can avoid repeating yourself, the controller files are really clean.

Updated: thanks @carlosantoniodasilva

Updated: Add debate