ruby_biscuit.rb

# app/controllers/events/registrations_controller.rb

class Events::RegistrationsController < ApplicationController
  def create
    @event = Event.subscribing.find(params[:event_id])

    @event.with_lock do
      sleep 0.25 # simule un travail plus complexe
      @ticket = Ticket.create!(
        validated_at: Time.zone.now,
        user_name: tickets_params[:user_name],
      )

      render json: @ticket, status: :created
    end
  end

  private

  def tickets_params
    params.require(:ticket).permit(:user_name)
  end
end