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 = Post.new(post_params)

    if @post.save

      redirect_to @post

    else

      render :new

    end

  end

​

  def edit

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

  end

​

  def update

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

    if @post.update(post_params)

      redirect_to @post

    else

      render :edit

    end

  end

​

  def destroy

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

    @post.destroy

    redirect_to posts_path

  end

​

  private

​

  def post_params

    params.require(:post).permit(:title, :body)

  end

end

bundle exec rails g controller