ruby on rails on nix

default.nix

with (import <nixpkgs> {});

let
  rubyenv = bundlerEnv {
    name = "app-env";
    # Setup for ruby gems using bundix generated gemset.nix
    inherit ruby_2_5;
    gemfile = ./Gemfile;
    lockfile = ./Gemfile.lock;
    gemset = ./gemset.nix;
    # Bundler groups available in this environment
    groups = ["default" "development" "test" "toolbox"];
  };
in stdenv.mkDerivation {
  name = "app-id";
  version = "0.0.1";

  buildInputs = [
    stdenv
    git

    # Ruby deps
    ruby_2_5.devEnv
    bundler
    bundix

    # Rails deps
    clang
    libxml2
    libxslt
    nodejs
    openssl
    postgresql_10
    readline
    yarn
    zlib

    rubyenv
  ];

  shellHook = ''
    export LIBXML2_DIR=${pkgs.libxml2}
    export LIBXSLT_DIR=${pkgs.libxslt}
  '';
}

Gemfile

source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

# Core
gem 'bootsnap',     '>= 1.1.0',  require: false
gem 'date'
gem 'dotenv-rails'
gem 'fileutils',    '~> 1.0.0'
gem 'pg',           '>= 0.18',   '< 2.0'
gem 'rails',        '~> 5.2.0'

# Misc
gem 'kaminari'

# Guest Pass
gem 'addressable'
gem 'rest-client'

# Cache
gem 'dalli'
gem 'kgio' # improves dalli performance

# Authentication / Authorization
gem 'clearance', github: 'emptyflask/clearance', branch: 'bcrypt-cost'
gem 'doorkeeper'
gem 'pundit'

# Search
gem 'elasticsearch-model'
gem 'elasticsearch-rails'

# API
gem 'active_model_serializers'

# Views
gem 'hamlit-rails'
gem 'simple_form'

# Assets
gem 'webpacker', '~> 3.0'

# Background processing
gem 'redis-namespace'
gem 'sidekiq'
gem 'sidekiq-cron'
gem 'sidekiq-failures'
gem 'sidekiq-history'

# Monitoring
gem 'honeybadger'
gem 'timber'
gem 'skylight'

group :development, :test do
  gem 'better_errors'
  gem 'binding_of_caller'
  gem 'byebug', platforms: [:mri]
  gem 'pry-rails'
end

group :development do
  gem 'listen',                 '>= 3.0.5',  '< 3.2'
  gem 'spring'
  gem 'spring-watcher-listen',  '~> 2.0.0'
  gem 'web-console',            '>= 3.3.0'
end

group :test do
  # gem 'capybara', '>= 2.15', '< 4.0'
  # gem 'chromedriver-helper'
  # gem 'selenium-webdriver'
  # gem 'poltergeist'
  gem 'simplecov'
  gem 'webmock'
end

group :toolbox do
  gem 'brakeman'
  gem 'capistrano-bundler',    require: false
  gem 'capistrano-chruby',     require: false
  gem 'capistrano-deploytags', require: false
  gem 'capistrano-direnv',     require: false
  gem 'capistrano-passenger',  require: false
  gem 'capistrano-pending',    require: false
  gem 'capistrano-rails',      require: false
  gem 'capistrano-sidekiq',    require: false
  gem 'capistrano-yarn'
  gem 'foreman'
  gem 'guard'
  gem 'guard-bundler'
  gem 'guard-minitest'
  gem 'guard-pow'
  gem 'rails-erd'
  gem 'rubocop'
end