Hi, i am following the stimulus learning path, but after the first video, when i try to see this one, i feel i miss something else, what video # should i see first to get here?

 ☒ One thing that has changed from the earlier videos is that now I use rails webpacker:install:stimulus to install stimulus. I think that #189 or #207 are great starting guides. I think that it's one of those things where it will take practice to get use to it. I often refer back to the handbook which has lots of great information. https://stimulusjs.org/handbook/introduction

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Great! is good to know. I wanna say thank your support. I did not have problems with that change, because indeed  i looking for documentation while im watching this video.  Now i realize that i was confused on how the video started. I thought that all the accounts , cities, countis, settings model  were already made before this video, but when i finished it, i noticed that all the practice was perfectly explained. Thank you

better to put this line of code.

import Rails from "@rails/ujs";

Otherwise, Rails.ajax call will be undefined.

Also, adding the intergration with select2 would be better, since it does not fire native events. 

 ☒ I agree. This application was in that weird transitional phase where the app/assets/javascript/application.js still had the require of UJS

//= require rails-ujs

However, on modern setups where webpacker is present and the asset pipeline is no longer handling the JS, you're absolutely correct.

 ☒For people like me who is hobbyist and only learned functional language such as ruby,  I really appreciate your teaching style in explaining each line of codes on the city_selector_controller.js. :)

For those seeking to integrate select2, add this code below:

initialize() {
    console.log('hello from city-selector controller')

    $("#state_id, #county_id").on('select2:select', function () {
      let event = new Event('change', { bubbles: true }) // fire a native event
      this.dispatchEvent(event);
    });

    this.check_forms()    
  }