registrations_controller.rb

class RegistrationsController < ApplicationController
  before_filter :authenticate_athlete!, :only => [:new, :create]

  def new
    @race = Race.find(params[:race_id])
    @registration = @race.registrations.new
  end
  
  def create
    @race = Race.find(params[:race_id])
    @registration = @race.registrations.new(registration_params)
    
    if @registration.save
      redirect_to @race, notice: 'Athlete registered.'
    else
      render 'new'
    end
  end
  
  private
  
  def registration_params
    params.require(:registration).permit(:athlete_id, :athlete_team)
  end
end