assign stripe_customer_id to newly registered users

app/models/user.rb

@@ -3,4 +3,14 @@ class User < ApplicationRecord
   # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
   devise :database_authenticatable, :registerable,
          :recoverable, :rememberable, :validatable
+
+  def to_s
+    email
+  end
+
+  after_create do
+    customer = Stripe::Customer.create(email: self.email)
+    update(stripe_customer_id: customer.id)
+  end    
+
 end

app/views/layouts/application.html.erb

@@ -18,6 +18,9 @@
       <%= link_to current_user.email, edit_user_registration_path %>
       <%= link_to "Log out", destroy_user_session_path, method: :delete %>
       <br>
+      Stripe customer id:
+      <%= current_user.stripe_customer_id %>
+      <br>
       Plan:
       <%= current_user.plan %>
       <br>

db/migrate/20210312160417_add_stripe_customer_id_to_users.rb

@@ -0,0 +1,5 @@
+class AddStripeCustomerIdToUsers < ActiveRecord::Migration[6.1]
+  def change
+    add_column :users, :stripe_customer_id, :string
+  end
+end