gistfile1.rb

class PostsController < ApplicationController
  before_filter :post, only: :create # this feels like it's "posting", not setting a post
  helper_method :post

  def create
    post.save
  end

  def post
    @post ||= Post.new(params.fetch(:post) {{}})
  end
end

# Imply the before_filter isn't "posting", but setting the post

class PostsController < ApplicationController
  before_filter :set_post, only: :create
  helper_method :post

  def create
    post.save
  end

  def post
    @post ||= Post.new(params.fetch(:post) {{}})
  end
  alias :set_post :post
end