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【メモ】 Rails5のnewでActiveRecordなし(-O)のオプションをつけるとどう変わるか

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下記2つのコマンドを叩いてみた時に生成されるファイルの差分です。

rails new app_name
rails new app_name -O

ちなみに、Railsのバージョンはv5.0.0.1です

.gitignore
-# Ignore the default SQLite database.
-/db/*.sqlite3
-/db/*.sqlite3-journal
Gemfile
-# Use sqlite3 as the database for Active Record
-gem 'sqlite3'
app/models/application_record.rb
# なくなります
config/application.rb
-require "active_record/railtie"
+# require "active_record/railtie"
config/database.yml
# なくなります

この辺までは、ぱっと見た感じで分かる。
これ以降が自分でDBへの依存をなくそうとすると多分思いつかなくてエラーが出るやつな気がする。

config/environments/development.rb
-  # Raise an error on page load if there are pending migrations.
-  config.active_record.migration_error = :page_load
config/environments/production.rb
-  # Do not dump schema after migrations.
-  config.active_record.dump_schema_after_migration = false
config/initializers/new_framework_defaults.rb
-# Require `belongs_to` associations by default. Previous versions had false.
-Rails.application.config.active_record.belongs_to_required_by_default = true
config/initializers/wrap_parameters.rb
-# To enable root element in JSON for ActiveRecord objects.
-# ActiveSupport.on_load(:active_record) do
-#   self.include_root_in_json = true
-# end
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