Redirect to admin root after confirmation

app/controllers/devise/confirmations_controller_decorator.rb

@@ -0,0 +1,7 @@
+Devise::ConfirmationsController.class_eval do
+  protected
+    # Override of devise method in Devise::ConfirmationsController
+    def after_confirmation_path_for(resource_name, resource)
+      spree.admin_path
+    end
+end

spec/controllers/devise/confirmation_controller_spec.rb

@@ -0,0 +1,15 @@
+require 'spec_helper'
+
+describe Devise::ConfirmationsController do
+  context "after confirmation" do
+    before do
+      e = create(:enterprise)
+      @request.env["devise.mapping"] = Devise.mappings[:enterprise]
+      spree_get :show, confirmation_token: e.confirmation_token
+    end
+
+    it "should redirect to admin root" do
+      expect(response).to redirect_to spree.admin_path
+    end
+  end
+end