Create a concern for manager invitations

Can be used elsewhere

app/controllers/admin/manager_invitations_controller.rb

@@ -3,6 +3,7 @@
 module Admin
   class ManagerInvitationsController < Spree::Admin::BaseController
     authorize_resource class: false
+    include ManagerInvitations
 
     def create
       @email = params[:email]
@@ -18,7 +19,7 @@ module Admin
         return
       end
 
-      new_user = create_new_manager
+      new_user = create_new_manager(@email, @enterprise)
 
       if new_user
         render json: { user: new_user.id }, status: :ok
@@ -27,21 +28,5 @@ module Admin
                status: :internal_server_error
       end
     end
-
-    private
-
-    def create_new_manager
-      password = Devise.friendly_token
-      new_user = Spree::User.create(email: @email, unconfirmed_email: @email, password: password)
-      new_user.reset_password_token = Devise.friendly_token
-      # Same time as used in Devise's lib/devise/models/recoverable.rb.
-      new_user.reset_password_sent_at = Time.now.utc
-      new_user.save!
-
-      @enterprise.users << new_user
-      EnterpriseMailer.manager_invitation(@enterprise, new_user).deliver_later
-
-      new_user
-    end
   end
 end

app/controllers/concerns/manager_invitations.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+module ManagerInvitations
+  extend ActiveSupport::Concern
+
+  def create_new_manager(email, enterprise)
+    password = Devise.friendly_token
+    new_user = Spree::User.create(email: email, unconfirmed_email: email, password: password)
+    new_user.reset_password_token = Devise.friendly_token
+    # Same time as used in Devise's lib/devise/models/recoverable.rb.
+    new_user.reset_password_sent_at = Time.now.utc
+    new_user.save!
+
+    enterprise.users << new_user
+    EnterpriseMailer.manager_invitation(@enterprise, new_user).deliver_later
+
+    new_user
+  end
+end