Rails Stripe Retrieve ID Error "No such plan"

Question

So my Plan says Stripe::InvalidRequestError at /orders/26/payments
No such plan: The title of my plan.
This code should check if the the plan already exists and if not create it and subscribe the user to it. I thought this worked because it was working for the case where I already had a plan with the same ID and it said "Plan already exists". How can I prevent this Error from happening?
This is my code:

class PaymentsController < ApplicationController
  before_action :set_order

  def new
  end

  def create
   @user = current_user

   customer = Stripe::Customer.create(
   source: params[:stripeToken],
   email:  params[:stripeEmail],
   )

# Storing the customer.id in the customer_id field of user
  @user.customer_id = customer.id

   @plan = Stripe::Plan.retrieve(@order.service.title)
    unless @plan
     plan = Stripe::Plan.create(
      :name => @order.service.title,
      :id => @order.service.title,
      :interval => "month",
      :currency => @order.amount.currency,
      :amount => @order.amount_pennies,
      )
    else
     subscription = Stripe::Subscription.create(
       :customer => @user.customer_id,
       :plan => @order.service.title
      )
    end

  @order.update(payment: plan.to_json, state: 'paid')
  redirect_to order_path(@order)

  rescue Stripe::CardError => e
  flash[:error] = e.message
  redirect_to new_order_payment_path(@order)

  end

  private

  def set_order
    @order = Order.where(state: 'pending').find(params[:order_id])
  end

end

Answer 1

The documentation says that if you try to retrieve a plan that does not exist, it will raise an error. So you just need to catch the error:

begin
  @plan = Stripe::Plan.retrieve(@order.service.title)
rescue 
  @plan = Stripe::Plan.create(...)
end