make own dummy, less confusing what is gem/engine and what is app

dummy/app/assets/config/manifest.js

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+//= link_tree ../images
+//= link_directory ../stylesheets .css
+//= link_directory ../javascript .js

dummy/app/assets/javascript/application.js

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+//= require opal_main
+
+Opal.require('opal_main');

dummy/app/assets/javascript/opal_main.js.rb

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+require "vue_r"

dummy/app/assets/stylesheets/application.css

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+/*
+ * This is a manifest file that'll be compiled into application.css, which will include all the files
+ * listed below.
+ *
+ * Any CSS (and SCSS, if configured) file within this directory, lib/assets/stylesheets, or any plugin's
+ * vendor/assets/stylesheets directory can be referenced here using a relative path.
+ *
+ * You're free to add application-wide styles to this file and they'll appear at the bottom of the
+ * compiled file so the styles you add here take precedence over styles defined in any other CSS
+ * files in this directory. Styles in this file should be added after the last require_* statement.
+ * It is generally better to create a new file per style scope.
+ *
+ *= require_tree .
+ *= require_self
+ */

dummy/app/channels/application_cable/channel.rb

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+module ApplicationCable
+  class Channel < ActionCable::Channel::Base
+  end
+end

dummy/app/channels/application_cable/connection.rb

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+module ApplicationCable
+  class Connection < ActionCable::Connection::Base
+  end
+end

dummy/app/controllers/application_controller.rb

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+class ApplicationController < ActionController::Base
+end

dummy/app/controllers/images_controller.rb

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+class ImagesController < ApplicationController
+  before_action :set_image, only: %i[ show edit update destroy ]
+
+  # GET /images
+  def index
+    @images = Image.all
+  end
+
+  # GET /images/1
+  def show
+  end
+
+  # GET /images/new
+  def new
+    @image = Image.new
+  end
+
+  # GET /images/1/edit
+  def edit
+  end
+
+  # POST /images
+  def create
+    @image = Image.new(image_params)
+
+    if @image.save
+      redirect_to @image, notice: "Image was successfully created."
+    else
+      render :new, status: :unprocessable_entity
+    end
+  end
+
+  # PATCH/PUT /images/1
+  def update
+    if @image.update(image_params)
+      redirect_to @image, notice: "Image was successfully updated."
+    else
+      render :edit, status: :unprocessable_entity
+    end
+  end
+
+  # DELETE /images/1
+  def destroy
+    @image.destroy
+    redirect_to images_url, notice: "Image was successfully destroyed."
+  end
+
+  private
+    # Use callbacks to share common setup or constraints between actions.
+    def set_image
+      @image = Image.find(params[:id])
+    end
+
+    # Only allow a list of trusted parameters through.
+    def image_params
+      params.fetch(:image, {})
+    end
+end

dummy/app/helpers/application_helper.rb

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+module ApplicationHelper
+end

dummy/app/javascript/application.js

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+// Configure your import map in config/importmap.rb. Read more: https://github.com/rails/importmap-rails
+import "@hotwired/turbo-rails"
+import "controllers"

dummy/app/javascript/controllers/application.js

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+import { Application } from "@hotwired/stimulus"
+
+const application = Application.start()
+
+// Configure Stimulus development experience
+application.debug = false
+window.Stimulus   = application
+
+export { application }

dummy/app/javascript/controllers/hello_controller.js

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+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  connect() {
+    this.element.textContent = "Hello World!"
+  }
+}

dummy/app/javascript/controllers/index.js

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+// Import and register all your controllers from the importmap under controllers/*
+
+import { application } from "controllers/application"
+
+// Eager load all controllers defined in the import map under controllers/**/*_controller
+import { eagerLoadControllersFrom } from "@hotwired/stimulus-loading"
+eagerLoadControllersFrom("controllers", application)
+
+// Lazy load controllers as they appear in the DOM (remember not to preload controllers in import map!)
+// import { lazyLoadControllersFrom } from "@hotwired/stimulus-loading"
+// lazyLoadControllersFrom("controllers", application)

dummy/app/jobs/application_job.rb

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+class ApplicationJob < ActiveJob::Base
+  # Automatically retry jobs that encountered a deadlock
+  # retry_on ActiveRecord::Deadlocked
+
+  # Most jobs are safe to ignore if the underlying records are no longer available
+  # discard_on ActiveJob::DeserializationError
+end

dummy/app/mailers/application_mailer.rb

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+class ApplicationMailer < ActionMailer::Base
+  default from: "from@example.com"
+  layout "mailer"
+end

dummy/app/models/application_record.rb

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+class ApplicationRecord < ActiveRecord::Base
+  primary_abstract_class
+end

dummy/app/models/image.rb

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+class Image  < ActiveYaml::Base
+end

dummy/app/views/images/index.html.haml

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+%h1 Listing kanta
+
+%table
+  %thead
+    %tr
+      %th
+      %th
+      %th
+
+  %tbody
+    - @kanta.each do |kantum|
+      %tr
+        %td= link_to 'Show', kantum
+        %td= link_to 'Edit', edit_kantum_path(kantum)
+        %td= link_to 'Destroy', kantum, method: :delete, data: { confirm: 'Are you sure?' }
+
+%br
+
+= link_to 'New Kantum', new_kantum_path

dummy/app/views/images/show.html.haml

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+#app
+  .flex.justify-center
+    = #@image.attributes
+
+  .flex.justify-center
+    %a.underline{ e_click: "bg_change" , r_class: 'back'}
+      {{ back }}
+:opal
+  puts "here1"
+  class Clicker < VueR::Application
+    def bg_change
+      self.state = !self.state
+    end
+    def back
+      self.state ? "bg-cyan-50" : "bg-cyan-200"
+    end
+  end
+
+  puts "here2"
+  click = Clicker.new(bg: 'bg-cyan-200' , state: true)
+  click.mount("#app")
+
+  puts "here3"

dummy/app/views/layouts/application.html.erb

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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Dummy</title>
+    <meta name="viewport" content="width=device-width,initial-scale=1">
+    <%= csrf_meta_tags %>
+    <%= csp_meta_tag %>
+
+    <%= stylesheet_link_tag "application" %>
+    <%= javascript_include_tag "application" %>
+  </head>
+
+  <body>
+    <%= yield %>
+  </body>
+</html>

dummy/app/views/layouts/mailer.html.erb

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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+    <style>
+      /* Email styles need to be inline */
+    </style>
+  </head>
+
+  <body>
+    <%= yield %>
+  </body>
+</html>

dummy/app/views/layouts/mailer.text.erb

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+<%= yield %>