flipperを使ってfeatureフラグを実装

if Flipper.enabled?(:hoge)
  'ほげほげ'
else
  'ふがふが'
end

gem 'flipper-active_record'

$ bundle install
$ rails g flipper:active_record # 以下のmigrationファイルが生成される

class CreateFlipperTables < ActiveRecord::Migration[7.1]
  def up
    create_table :flipper_features do |t|
      t.string :key, null: false
      t.timestamps null: false
    end
    add_index :flipper_features, :key, unique: true

    create_table :flipper_gates do |t|
      t.string :feature_key, null: false
      t.string :key, null: false
      t.text :value
      t.timestamps null: false
    end
    add_index :flipper_gates, [:feature_key, :key, :value], unique: true, length: { value: 255 }
  end

  def down
    drop_table :flipper_gates
    drop_table :flipper_features
  end
end

$ rails db:migrate

gem 'flipper-ui'

$ bundle install

Rails.application.routes.draw do
  # ...
  mount Flipper::UI.app(Flipper) => '/flipper'
end