phone_books_controller.rb

def index
  @phone_books = PhoneBook.where(ip: request.remote_ip)
end

def create
  @phone_book = PhoneBook.new
  @phone_book.contact_name = params[:phone_book][:contact_name]
  @phone_book.phone = params[:phone_book][:phone]
  @phone_book.ip = request.remote_ip

  respond_to do |format|
    if @phone_book.save
      format.html { redirect_to @phone_book, notice: 'Phone book was successfully created.' }
      format.json { render :show, status: :created, location: @phone_book }
    else
      format.html { render :new }
      format.json { render json: @phone_book.errors, status: :unprocessable_entity }
    end
  end
end