Hotwire Turbo for SPA-like user experiences

# Controller responding with Turbo Stream
class PostsController < ApplicationController
  def create
    @post = Post.new(post_params)

    if @post.save
      respond_to do |format|
        format.turbo_stream do
          render turbo_stream: turbo_stream.prepend(
            "posts",
            partial: "posts/post",
            locals: { post: @post }
          )
        end
        format.html { redirect_to @post }
      end
    else
      render :new, status: :unprocessable_entity
    end
  end

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

    respond_to do |format|
      format.turbo_stream do
        render turbo_stream: turbo_stream.remove(@post)
      end
      format.html { redirect_to posts_path }
    end
  end

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

    if @post.update(post_params)
      respond_to do |format|
        format.turbo_stream do
          render turbo_stream: [
            turbo_stream.replace(
              @post,
              partial: "posts/post",
              locals: { post: @post }
            ),
            turbo_stream.update(
              "flash",
              partial: "shared/flash",
              locals: { message: "Post updated!" }
            )
          ]
        end
        format.html { redirect_to @post }
      end
    end
  end
end

# Broadcasting Turbo Streams (for real-time updates)
class Post < ApplicationRecord
  after_create_commit do
    broadcast_prepend_to "posts",
      target: "posts",
      partial: "posts/post",
      locals: { post: self }
  end

  after_update_commit do
    broadcast_replace_to "posts"
  end

  after_destroy_commit do
    broadcast_remove_to "posts"
  end

  # Broadcast to specific users
  after_create_commit do
    broadcast_prepend_to(
      [user, "posts"],
      target: "user_posts",
      partial: "posts/post"
    )
  end
end

# Multiple Turbo Stream actions
def multi_update
  render turbo_stream: [
    turbo_stream.replace("post_#{@post.id}", partial: "posts/post"),
    turbo_stream.update("comments_count", @post.comments.count),
    turbo_stream.append("notifications", partial: "shared/notification"),
    turbo_stream.remove("draft_indicator")
  ]
end