Ensure created users are associated with customers

When a user is created with the same email as existing customers
Then the user is associated with these customers

So that the user can access the private shops where he has been invited
to before signup

app/models/spree/user_decorator.rb

@@ -19,6 +19,7 @@ Spree.user_class.class_eval do
   accepts_nested_attributes_for :ship_address
 
   attr_accessible :enterprise_ids, :enterprise_roles_attributes, :enterprise_limit, :locale, :bill_address_attributes, :ship_address_attributes
+  after_create :associate_customers
 
   validate :limit_owned_enterprises
 
@@ -64,6 +65,10 @@ Spree.user_class.class_eval do
     Delayed::Job.enqueue ConfirmSignupJob.new(id)
   end
 
+  def associate_customers
+    self.customers = Customer.where(email: email)
+  end
+
   def can_own_more_enterprises?
     owned_enterprises(:reload).size < enterprise_limit
   end

spec/models/spree/user_spec.rb

@@ -77,6 +77,17 @@ describe Spree.user_class do
       end.to enqueue_job Delayed::PerformableMethod
       expect(Delayed::Job.last.payload_object.method_name).to eq(:send_on_create_confirmation_instructions_without_delay)
     end
+
+    context "with the the same email as existing customers" do
+      let(:email) { Faker::Internet.email }
+      let!(:customer1) { create(:customer, user: nil, email: email) }
+      let!(:customer2) { create(:customer, user: nil, email: email) }
+      let!(:user) { create(:user, email: email) }
+
+      it "should associate these customers with the created user" do
+        expect(user.customers.reload).to include customer1, customer2
+      end
+    end
   end
 
   context "confirming email" do