invite to edit notifications marked as read in system once map is visited

app/controllers/maps_controller.rb

@@ -8,6 +8,7 @@ class MapsController < ApplicationController
   def show
     respond_to do |format|
       format.html do
+        UserMap.where(map: @map, user: current_user).map(&:mark_invite_notifications_as_read)
         @allmappers = @map.contributors
         @allcollaborators = @map.editors
         @alltopics = policy_scope(@map.topics)

app/models/user_map.rb

@@ -2,4 +2,10 @@
 class UserMap < ApplicationRecord
   belongs_to :map
   belongs_to :user
+
+  def mark_invite_notifications_as_read
+    Mailboxer::Notification.where(notified_object: self).each do |notification|
+      Mailboxer::Receipt.where(notification: notification).update_all(is_read: true)
+    end
+  end
 end