Rails 7.0 demo with Hotwire and Tailwind

rvm: 1.29.12
ruby: 3.0.3
rails: 7.0.0

rails new blog --css tailwind

rails g scaffold post title

rails action_text:install

rails db:create db:migrate

# app/models/post.rb
class Post < ApplicationRecord
  validates :title, presence: true

  has_rich_text :content
end

<!-- app/views/posts/_form.html.erb -->
<!-- ... -->
<!-- add field :content -->
<div class="my-5">
  <%= form.label :content %>
  <%= form.rich_text_area :content, class: "block shadow rounded-md border border-gray-200 outline-none px-3 py-2 mt-2 w-full" %>
</div>
<!-- ... -->

<!-- app/views/posts/_post.html.erb -->
<!-- ... -->
<!-- add field :content -->
 <p class="my-5">
   <%= @post.content %>
 </p>
<!-- ... -->

<!-- app/views/posts/show.html.erb -->
<!-- ... -->
<!-- add field :content -->
 <p class="my-5 inline-block">
   <%= @post.content %>
 </p>
<!-- ... -->

# app/controllers/posts_controller.rb
class PostsController < ApplicationController
# ...
 private
   def post_params
     params.require(:post).permit(:title, :content) # add content
   end
end

<!-- app/views/posts/index.html.erb -->
<div class="w-full">
  <div class="flex justify-between items-center">
    <h1 class="text-white text-lg font-bold text-4xl">Posts</h1>
    <%= link_to 'New Post', new_post_path,
      class: "rounded-lg py-3 px-5 bg-blue-600 text-white block font-medium",
      data: { 'turbo-frame': 'new_post' }
    %>
  </div>

  <%= turbo_frame_tag :new_post %>

  <div class="min-w-full">
    <%= turbo_frame_tag :posts do %>
      <%= render @posts %>
    <% end %>
  </div>
</div>

<!-- app/views/posts/new.html.erb -->
<%= turbo_frame_tag :new_post do %>
  <div class="w-full bg-white p-4 rounded-md mt-4">
    <h1 class="text-lg font-bold text-4xl">New post</h1>

    <%= render "form", post: @post %>

    <%= link_to 'Back to posts', posts_path, class: "ml-2 rounded-lg py-3 px-5 bg-gray-100 inline-block font-medium" %>
  </div>
<% end %>

# app/controllers/posts_controller.rb
class PostsController < ApplicationController
  # ...
  def create
    @post = Post.new(post_params)

    respond_to do |format|
      if @post.save
        format.turbo_stream # add format turbo_stream
        format.html { redirect_to posts_path }
        format.json { render :show, status: :created, location: @post }
      else
        format.turbo_stream # add format turbo_stream
        format.html { render posts_path, status: :unprocessable_entity }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
  end

  def update
    respond_to do |format|
      if @post.update(post_params)
        format.turbo_stream # add format turbo_stream
        format.html { redirect_to posts_path, notice: "Post was successfully updated." }
        format.json { render :show, status: :ok, location: @post }
      else
        format.turbo_stream # add format turbo_stream
        format.html { render posts_path, status: :unprocessable_entity }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
  end

  def destroy
    @post.destroy
    respond_to do |format|
      format.turbo_stream # add format turbo_stream
      format.html { redirect_to posts_url, notice: "Post was successfully destroyed." }
      format.json { head :no_content }
    end
  end
  # ...
end

<!-- app/views/posts/create.turbo_stream.erb -->
<% if @post.errors.present? %>
   <%= notice_stream(message: :error, status: 'red') %>
   <%= form_post_stream(post: @post) %>
<% else %>
   <%= notice_stream(message: :create, status: 'green') %>

   <%= turbo_stream.replace :new_post do %>
      <%= turbo_frame_tag :new_post %>
   <% end %>

   <%= turbo_stream.prepend 'posts', partial: 'post', locals: { post: @post } %>
<% end %>

<!-- app/views/posts/update.turbo_stream.erb -->
<% if @post.errors.present? %>
  <%= notice_stream(message: :error, status: 'red') %>

  <%= form_post_stream(post: @post) %>

<% else %>
  <%= notice_stream(message: :update, status: 'green') %>

  <%= turbo_stream.replace dom_id(@post), partial: 'post', locals: { post: @post } %>
<% end %>

<!-- app/views/posts/destroy.turbo_stream.erb -->
<%= notice_stream(message: :delete, status: 'green') %>
<%= turbo_stream.remove @post %>

# app/helpers/posts_helper.rb
module PostsHelper
  NOTICE = {
    create: 'Post created successfully',
    update: 'Post updated successfully',
    delete: 'Post deleted successfully',
    error: 'Something went wrong'
  }.freeze

  def notice_stream(message:, status:)
    turbo_stream.replace 'notice', partial: 'notice', locals: { notice: NOTICE[message], status: status }
  end

  def form_post_stream(post:)
    turbo_stream.replace 'form', partial: 'form', locals: { post: post }
  end
end

<!-- app/views/layouts/application.html.erb -->
 <%= turbo_frame_tag :notice, class: 'w-full' do %>
 <% end %>

<!-- app/views/posts/_notice.html.erb -->
<p class="animate-pulse opacity-80 w-full py-2 px-3 bg-<%= status %>-50 mb-5 text-<%= status %>-500 font-medium rounded-lg inline-block" id="notice"><%= notice %></p>

<!-- app/views/posts/_form.html.erb --->
# config/routes.rb
get '/notice', to: 'posts#clear_message'

<!-- app/views/posts/_form.html.erb -->
  <%= turbo_frame_tag dom_id post do %>
    <%= form_with(
      model: post, 
      id: 'form',
      class: "contents",
      html: {
        data: { controller: 'notice', action: 'submit->notice#clear' }
      }
    ) do |form| %>

   <!-- fields  --->

   <% end %>
<% end %>

# app/javascript/controllers/notice_controller.js
import { Controller } from "@hotwired/stimulus"
import { FetchRequest } from "@rails/request"

// Connects to data-controller="notice"
export default class extends Controller {
  clear(event) {
    event.preventDefault()

    setTimeout(async () => {
      const request = new FetchRequest("get", '/notice', { responseKind: "turbo-stream" })
      await request.perform()
    }, 5000)

    event.target.requestSubmit()
  }
}

# app/controllers/posts_controller.rb
class PostsController < ApplicationController
 # ... actions

 def clear_message
  respond_to do |format|
    format.turbo_stream
  end
 end
end

# config/routes.rb
Rails.application.routes.draw do
  # Set Post index to landing page
  root 'posts#index'
end

rails s