Rubocop config

Rubocopconfig.md

Add following to Gemfile

group :development, :test do
  gem 'rubocop'
  gem 'rubocop-performance'
  gem 'rubocop-rails'
  gem 'rubocop-minitest' # or gem 'rubocop-rspec' depending on your test suite
end

And than create .rubocop.yml file at root fo your project and add following to it:

require: 
  - rubocop-performance
  - rubocop-rails
  - rubocop-rspec # or rubocop-minitest
 
 
AllCops:
  # Exclude auto-generated files by Rails
  TargetRubyVersion: 2.7
  TargetRailsVersion: 5.2
  Exclude:
    - 'db/schema.rb'
    - 'node_modules/**/*'
    - 'vendor/bundle/**/*'
    - 'bin/**/*'
    
Layout/LineLength:
  Max: 120
  
Metrics/MethodLength:
  Max: 23

Metrics/BlockLength:
  Exclude:
    - config/**/*
    - spec/**/*

Lint/AmbiguousBlockAssociation:
  Exclude:
    - spec/**/*

Style/Documentation:
  Enabled: false

Obviously, you can tune the config file as per your rpeferences. Enjoy.

Metrics/LineLength:
Max: 120

Above namespace is update to

Layout/LineLength:
Max: 120