sass-rails | Ruby on Rails stylesheet engine for Sass | Application Framework library

I'm aware of the recent mimemagic issues, which I managed to resolve on one of my Rails projects by bundle updating to 0.3.7 - but for some reason, I can't resolve it on the project below.

I have a Rails 6 project which I'm setting up for the first time on a new laptop. My laptop doesn't have the correct Ruby setup, so I've added a Dockerfile to my project like so:-

Dockerfile

does anyone know why the error

"ERROR: While executing gem ... (Errno::EACCES)

Permission denied @ rb_sysopen - C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/pg-1.2.3-x64-mingw32/lib/2.7/pg_ext.so"

appears while trying to install pg gem in Windows 10?
I tried running gem install pg with admin privileges in command prompt in my application folder, but it throws this error.. I also checked out site https://rubygems.org/gems/pg and there copied how to install pg via command line, and what to include in Gemfile.
Here is my gem file:

I am trying to completely remove Sprockets from a Rails 6.1.3.2 with Ruby 3.0 project

One of the Stackoverflow question/answers said that I need to remove the sass-rails gem from the Gemfile.

Per the sass-rails gem Github repo:

Im running ruby version 2.6.1 with docker. Rake gem is version 13.0.1.
Whenever I tried docker-compose up, it always fails and throws this error everytime:
This error did not exist before.

I am more of a Java programmer and still somewhat new to development (2 years or so, can write Java code & web apps just fine) however the company I work for has 4 Rails applications and was asked to get this application working called CtrlPanel. I have been having to learn Ruby on Rails in order to help get this issue with this app fixed and get it working.

I have been working on this problem for over a week all day long every day and nothing I do is fixing it.

I fixed everything to the point the app comes up, web server runs serves the pages but all views are white screens as long as this application.html.haml file is present. I re-wrote the file with very basic bootstrap and it sort of works but nothing looks right. The problem seems to stem from 1 single like that simply says: = javascript_include_tag "application"

I have been all over the internet and have tried every single fix from changing coffee-script-source to v1.8.0 as I read Windows has an issue with newer rails and that file, I have tried every variation of changing it from application to default, and every type of ending you can think of no matter what I do it gives me this error message which I can not seem to find.

I am not even sure WHAT that line does, I assume it has to do with the new Google Maps API and I verified the key is valid and it was working before.

This is the error is it giving it says the line with "= javascript_include_tag" "application" giving error ExecJS::RuntimeError at / SyntaxError: [stdin]:1:1: unexpected //=

I am running a PC on Windows 10 20H2 x64 UEFI ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x64-mingw32] Rails 6.1.3

(I did also install Ubuntu on another machine and it gives the exact same error, also gives the same error on another Windows machine)

The app is working IF I delete the "application.html.haml" file and put in a skeleton basic version all of the other views start working but of course none of them look right no menus no bootstrap no nothing.
Here is the application.html.haml file.

I am using Rails 6.1.3 with Ruby 2.7.2 for a mostly static pages app. The app has a registration form that a student must complete and download as a PDF file to print, persistence is not required at this point. It was working fine with Dhalang (Google's puppeteer wrap) gem, then I did a Javascript routine for a different part of the app and it stopped to work. The process should be: A view has a button link_to the route "new_student_url" set up to the "students_controller#new" action which should get the views/students/new to render the _form, At this point I have the button pointing and recognizing the route but when I click on it it just ignores the event; Oddly enough, if I right click the button to 'open link in a new tab', it works... =/ I have read several other cases and found that most of them are caused by a Turbolinks issue, so I did review my Turbolinks setup with Webpack and the app/javascript/packs/application.js seems to be ok, please help.

This is the link button:

I'm trying to build a Rails application on Mac OS Big Sur with the following versions ...

I have cloned an existing project and trying to run it in my system. Since this is the first time I don't have any Gemfile.lock file in my directory. I tried running bundle install and the following errors occur:

Why does Ruby version 2.7.1p83 and rails 6.0.3.5 says config.action_dispatch is nil in the following ApplicationController code?