気持ち悪いコード

after2_session_controller.rb

def create
  # リファクタリング後
  @staff = Staff.new(params[:staff])
  
  if staff = Staff.find_by(email: @staff.email)
    session[:staff_id] = staff.id
    redirect :root
  else
    render :new
  end
end

after_session_controller.rb

def create
  # リファクタリング後
  @staff = Staff.new(params[:staff])
  
  render :new and return if @staff.email.blank?
  
  staff = Staff.find_by(email: @staff.email)
  session[:staff_id] = staff.id
  redirect :root
end

session_controller.rb

def create
  @staff = Staff.new(params[:staff])
  
  if @staff.email.present?
    staff = Staff.find_by(email: @staff.email)
  end
  
  if staff
    session[:staff_id] = staff.id
    redirect :root
  else
    render :new
  end
end