I am trying to pass the data from an SQL database to a non-SQl database with mongo DB and for this I use mongify 1.3.2, Ruby 2.7.6.2, Rails 5.2.3 and within gemfile I have

source "http://rubygems.org"

Specify your gem's dependencies in template_del.gemspec

gemspec

gem "activerecord-mysql-adapter", "~> 4.2.11.1" and I get the following error when inside cmd and in the application folder where I have database.config

Specified 'mysql' for database adapter, but the gem is not loaded. Add gem 'mysql' to your gemfile (and ensure its version is at the minium required by ActiveRecord ).(Gem::LoadError)