YuruToot/db/migrate/20161222204147_create_follow_requests.rb

class CreateFollowRequests < ActiveRecord::Migration[5.0]
  def change
    create_table :follow_requests do |t|
      t.integer :account_id, null: false
      t.integer :target_account_id, null: false

      t.timestamps null: false
    end

    add_index :follow_requests, [:account_id, :target_account_id], unique: true
  end
end