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@dsatoh(Daisuke Satoh)

rails newで--skip-active-recordをつけ[た|なかった]時の違い

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Mongo 6.3の公式ドキュメントには以下のように書かれています。

If you are creating a new Rails application, you’ll have to use the --skip-active-record flag with rails new.

rails newの時に--skip-active-recordを付け忘れた場合でも、どこに差異があるかを把握していれば後からでも直せるじゃん！ってことで一度実験したのでメモ的な意味で記事にしました。

この記事中でのバージョンなど

  • Ruby 2.4.1
  • Rails 5.1.4

diffるためのrailsアプリケーションを作る

  1. rails newするためのrailsを用意

    $ mkdir -p rails_app_1/sample_app
$ cd rails_app_1/sample_app
$ cat <<EOS >Gemfile
source 'http://rubygems.org'
gem 'rails'
EOS
$ bundle install --path tmp/bundle

  2. ここで複製

    $ cd ../../
$ cp -r rails_app_1 rails_app_2

  3. それぞれrails newする 

    $ cd rails_app_1/sample_app
$ bundle exec rails new . --skip-bundle --force
$ cd ../../rails_app_2/sample_app
$ bundle exec rails new . --skip-bundle --skip-active-record --force

    ※ --forceオプションは1.で作ったGemfileを上書きするためです。

diffる

$ diff -uprN rails_app_1/sample_app rails_app_2/sample_app > diff.patch

Gist: diff.patch

.gitignore

  • /db/以下を削除

    diff -uprN rails_app_1/sample_app/.gitignore rails_app_2/sample_app/.gitignore
--- rails_app_1/sample_app/.gitignore 2018-02-03 20:14:53.000000000 +0900
+++ rails_app_2/sample_app/.gitignore 2018-02-03 20:16:18.000000000 +0900
@@ -7,10 +7,6 @@
 # Ignore bundler config.
 /.bundle

-# Ignore the default SQLite database.
-/db/*.sqlite3
-/db/*.sqlite3-journal
-
 # Ignore all logfiles and tempfiles.
 /log/*
 /tmp/*

Gemfile

  • SQLite3を削除

    diff -uprN rails_app_1/sample_app/Gemfile rails_app_2/sample_app/Gemfile
--- rails_app_1/sample_app/Gemfile  2018-02-03 20:14:53.000000000 +0900
+++ rails_app_2/sample_app/Gemfile  2018-02-03 20:16:18.000000000 +0900
@@ -8,8 +8,6 @@ end

 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 5.1.4'
-# Use sqlite3 as the database for Active Record
-gem 'sqlite3'
 # Use Puma as the app server
 gem 'puma', '~> 3.7'
 # Use SCSS for stylesheets

app/models/application_record.rb

  • ファイルごと削除

    diff -uprN rails_app_1/sample_app/app/models/application_record.rb rails_app_2/sample_app/app/models/application_record.rb
--- rails_app_1/sample_app/app/models/application_record.rb 2018-02-03 20:14:53.000000000 +0900
+++ rails_app_2/sample_app/app/models/application_record.rb 1970-01-01 09:00:00.000000000 +0900
@@ -1,3 +0,0 @@
-class ApplicationRecord < ActiveRecord::Base
-  self.abstract_class = true
-end

bin/setup

  • rails db:setupの呼び出しを削除

    diff -uprN rails_app_1/sample_app/bin/setup rails_app_2/sample_app/bin/setup
--- rails_app_1/sample_app/bin/setup  2018-02-03 20:14:53.000000000 +0900
+++ rails_app_2/sample_app/bin/setup  2018-02-03 20:16:18.000000000 +0900
@@ -22,14 +22,6 @@ chdir APP_ROOT do
   # system('bin/yarn')

-  # puts "\n== Copying sample files =="
-  # unless File.exist?('config/database.yml')
-  #   cp 'config/database.yml.sample', 'config/database.yml'
-  # end
-
-  puts "\n== Preparing database =="
-  system! 'bin/rails db:setup'
-
   puts "\n== Removing old logs and tempfiles =="
   system! 'bin/rails log:clear tmp:clear'

bin/update

  • rails db:migrateの呼び出しを削除

    diff -uprN rails_app_1/sample_app/bin/update rails_app_2/sample_app/bin/update
--- rails_app_1/sample_app/bin/update 2018-02-03 20:14:53.000000000 +0900
+++ rails_app_2/sample_app/bin/update 2018-02-03 20:16:18.000000000 +0900
@@ -18,9 +18,6 @@ chdir APP_ROOT do
   system! 'gem install bundler --conservative'
   system('bundle check') || system!('bundle install')

-  puts "\n== Updating database =="
-  system! 'bin/rails db:migrate'
-
   puts "\n== Removing old logs and tempfiles =="
   system! 'bin/rails log:clear tmp:clear'

config/application.rb

  • require 'rails/all'を使わず、個別にロード

    diff -uprN rails_app_1/sample_app/config/application.rb rails_app_2/sample_app/config/application.rb
--- rails_app_1/sample_app/config/application.rb  2018-02-03 20:14:53.000000000 +0900
+++ rails_app_2/sample_app/config/application.rb  2018-02-03 20:16:18.000000000 +0900
@@ -1,6 +1,16 @@
 require_relative 'boot'

-require 'rails/all'
+require "rails"
+# Pick the frameworks you want:
+require "active_model/railtie"
+require "active_job/railtie"
+# require "active_record/railtie"
+require "action_controller/railtie"
+require "action_mailer/railtie"
+require "action_view/railtie"
+require "action_cable/engine"
+require "sprockets/railtie"
+require "rails/test_unit/railtie"

 # Require the gems listed in Gemfile, including any gems
 # you've limited to :test, :development, or :production.

ちなみにrequire 'rails/all'をすると

vendor/bundle/ruby/2.4.0/gems/railties-5.1.2/lib/rails/all.rb
require "rails"

%w(
  active_record/railtie
  action_controller/railtie
  action_view/railtie
  action_mailer/railtie
  active_job/railtie
  action_cable/engine
  rails/test_unit/railtie
  sprockets/railtie
).each do |railtie|
  begin
    require railtie
  rescue LoadError
  end
end

以上のソースがロードされます。
--skip-active-recordをしたときは、ActiveRecordは除外するけどActiveModelはロードするという挙動のようです。
まぁMongoidもActiveModelは使いますしね。

config/database.yml

  • ファイルごと削除

    diff -uprN rails_app_1/sample_app/config/database.yml rails_app_2/sample_app/config/database.yml
--- rails_app_1/sample_app/config/database.yml  2018-02-03 20:14:53.000000000 +0900
+++ rails_app_2/sample_app/config/database.yml  1970-01-01 09:00:00.000000000 +0900
@@ -1,25 +0,0 @@
-# SQLite version 3.x
-#   gem install sqlite3
-#
-#   Ensure the SQLite 3 gem is defined in your Gemfile
-#   gem 'sqlite3'
-#
-default: &default
-  adapter: sqlite3
-  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
-  timeout: 5000
-
-development:
-  <<: *default
-  database: db/development.sqlite3
-
-# Warning: The database defined as "test" will be erased and
-# re-generated from your development database when you run "rake".
-# Do not set this db to the same as development or production.
-test:
-  <<: *default
-  database: db/test.sqlite3
-
-production:
-  <<: *default
-  database: db/production.sqlite3

config/environments/development.rb

  • config.active_record.migration_error = :page_load 削除

    diff -uprN rails_app_1/sample_app/config/environments/development.rb rails_app_2/sample_app/config/environments/development.rb
--- rails_app_1/sample_app/config/environments/development.rb 2018-02-03 20:14:53.000000000 +0900
+++ rails_app_2/sample_app/config/environments/development.rb 2018-02-03 20:16:19.000000000 +0900
@@ -34,9 +34,6 @@ Rails.application.configure do
   # Print deprecation notices to the Rails logger.
   config.active_support.deprecation = :log

-  # Raise an error on page load if there are pending migrations.
-  config.active_record.migration_error = :page_load
-
   # Debug mode disables concatenation and preprocessing of assets.
   # This option may cause significant delays in view rendering with a large
   # number of complex assets.

config/environments/production.rb

  • config.active_record.dump_schema_after_migration = false 削除

    diff -uprN rails_app_1/sample_app/config/environments/production.rb rails_app_2/sample_app/config/environments/production.rb
--- rails_app_1/sample_app/config/environments/production.rb  2018-02-03 20:14:53.000000000 +0900
+++ rails_app_2/sample_app/config/environments/production.rb  2018-02-03 20:16:19.000000000 +0900
@@ -85,7 +85,4 @@ Rails.application.configure do
     logger.formatter = config.log_formatter
     config.logger    = ActiveSupport::TaggedLogging.new(logger)
   end
-
-  # Do not dump schema after migrations.
-  config.active_record.dump_schema_after_migration = false
 end

config/initializers/wrap_parameters.rb

  • ActiveSupport.on_load(:active_record) 削除(もともとコメントだけど)

    diff -uprN rails_app_1/sample_app/config/initializers/wrap_parameters.rb rails_app_2/sample_app/config/initializers/wrap_parameters.rb
--- rails_app_1/sample_app/config/initializers/wrap_parameters.rb 2018-02-03 20:14:53.000000000 +0900
+++ rails_app_2/sample_app/config/initializers/wrap_parameters.rb 2018-02-03 20:16:19.000000000 +0900
@@ -7,8 +7,3 @@
 ActiveSupport.on_load(:action_controller) do
   wrap_parameters format: [:json]
 end
-
-# To enable root element in JSON for ActiveRecord objects.
-# ActiveSupport.on_load(:active_record) do
-#   self.include_root_in_json = true
-# end

db/seeds.rb

  • db/ディレクトリごと削除

    diff -uprN rails_app_1/sample_app/db/seeds.rb rails_app_2/sample_app/db/seeds.rb
--- rails_app_1/sample_app/db/seeds.rb  2018-02-03 20:14:53.000000000 +0900
+++ rails_app_2/sample_app/db/seeds.rb  1970-01-01 09:00:00.000000000 +0900
@@ -1,7 +0,0 @@
-# This file should contain all the record creation needed to seed the database with its default values.
-# The data can then be loaded with the rails db:seed command (or created alongside the database with db:setup).
-#
-# Examples:
-#
-#   movies = Movie.create([{ name: 'Star Wars' }, { name: 'Lord of the Rings' }])
-#   Character.create(name: 'Luke', movie: movies.first)

test/test_helper.rb

  • fixtures :all 削除

    diff -uprN rails_app_1/sample_app/test/test_helper.rb rails_app_2/sample_app/test/test_helper.rb
--- rails_app_1/sample_app/test/test_helper.rb  2018-02-03 20:14:53.000000000 +0900
+++ rails_app_2/sample_app/test/test_helper.rb  2018-02-03 20:16:19.000000000 +0900
@@ -2,8 +2,5 @@ require File.expand_path('../../config/e
 require 'rails/test_help'

 class ActiveSupport::TestCase
-  # Setup all fixtures in test/fixtures/*.yml for all tests in alphabetical order.
-  fixtures :all
-
   # Add more helper methods to be used by all tests here...
 end

以上

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