InvalidRequest Customer does not have card with ID - ruby-on-rails

Question

I have Stripe setup and I am trying to delete the current user card on file and add a new one.
In doing so I get the error message Stripe::InvalidRequestError Customer cus_3hWPcPgUi04tCO does not have card with ID {#user.subscription.stripe_card_id}
It points to the subscription controller on line customer.cards.retrieve("{#user.subscription.stripe_card_id}").delete()
I'm not sure how to get it to call the card id, as it should be using the test card id of card_103hWP26pFykwX9Rv8dExvYh.
class SubscriptionsController < ApplicationController
def new
plan = Plan.find(params[:plan_id])
#subscription = plan.subscriptions.build
if params[:PayerID]
#subscription.paypal_customer_token = params[:PayerID]
#subscription.paypal_payment_token = params[:token]
#subscription.email = #subscription.paypal.checkout_details.email
end
end
def create
#subscription = Subscription.new(params[:subscription])
if #subscription.save_with_payment
redirect_to #subscription, :notice => "Thank you for subscribing!"
else
render :new
end
end
def show
#subscription = Subscription.find(params[:id])
end
def paypal_checkout
plan = Plan.find(params[:plan_id])
subscription = plan.subscriptions.build
redirect_to subscription.paypal.checkout_url(
return_url: new_subscription_url(:plan_id => plan.id),
cancel_url: root_url
)
end
def updatesubscription
#user = current_user
#customer = Stripe::Customer.retrieve(#user.subscription.stripe_customer_token)
#customer.update_subscription(:plan => "1", :prorate => true)
current_user.save!
flash.alert = 'Your subscription has been updated!'
redirect_to root_url
end
def cancelsubscription
#user = current_user
#customer = Stripe::Customer.retrieve(#user.subscription.stripe_customer_token)
#customer.cancel_subscription()
current_user.save!
flash.alert = 'Your subscription has been cancelled successfully!'
redirect_to root_url
end
def showcard
#user = current_user
Stripe::Customer.retrieve(#user.subscription.stripe_customer_token).cards.all()
end
def changecard
#user = current_user
#customer = Stripe::Customer.retrieve(#user.subscription.stripe_customer_token)
card = #customer.cards.create({
:card => #user.subscription.stripe_customer_token
})
#customer.default_card = card
#customer.save
end
def suspend
#user = current_user
#user.subscription.suspend_paypal
flash.alert = 'Billing has been suspended!'
redirect_to root_url
end
def reactivate
#user = current_user
#user.subscription.reactivate_paypal
flash.alert = 'Billing has been activated!'
redirect_to root_url
end
def updatebilling
#user = current_user
customer = Stripe::Customer.retrieve(#user.subscription.stripe_customer_token)
customer.cards.retrieve("{#user.subscription.stripe_card_id}").delete()
customer.cards.create({
card: {
number: params[:user][:scardnumber],
exp_month: params[:user][:sexp_month],
exp_year: params[:user][:sexp_year],
cvc: params[:user][:scvc],
name: params[:user][:sname],
address_line1: params[:user][:sbilling_address1],
address_line2: params[:user][:sbilling_address2],
address_city: params[:user][:saddress_city],
address_zip: params[:user][:saddress_zip],
address_state: params[:user][:saddress_state],
address_country: params[:user][:saddress_country]
}
})
if customer.save!
#user.stripe_card_id = customer.active_card.id
#user.save!
flash.alert = 'Billing information updated successfully!'
redirect_to root_url
else
flash.alert = 'Stripe error'
redirect_to root_url
end
end
end

Answer 1

Just use
customer.cards.retrieve(#user.subscription.stripe_card_id).delete()
instead of
customer.cards.retrieve("{#user.subscription.stripe_card_id}").delete().

Answer 2

The field should be a string already, just do
customer.cards.retrieve(#user.subscription.stripe_card_id).delete()