FIX: do not add invited user to automatic groups

app/models/invite.rb

@@ -139,7 +139,7 @@ class Invite < ActiveRecord::Base
       end
     else
       if topic && topic.category && Guardian.new(invited_by).can_invite_to?(topic)
-        group_ids = topic.category.groups.pluck(:id) - invite.invited_groups.pluck(:group_id)
+        group_ids = topic.category.groups.pluck(:id) - invite.invited_groups.pluck(:group_id) - Group.where(automatic: true).pluck(:id)
         group_ids.each { |group_id| invite.invited_groups.create!(group_id: group_id) }
       end
     end

spec/models/invite_spec.rb

@@ -162,6 +162,13 @@ describe Invite do
       invite = group_private_topic.invite_by_email(tl2_user, 'foo@bar.com')
       expect(invite.groups.count).to eq(0)
     end
+
+    context 'automatic groups' do
+      it 'should not add invited user to automatic groups' do
+        group.update!(automatic: true)
+        expect(group_private_topic.invite_by_email(Fabricate(:admin), iceking).groups.count).to eq(0)
+      end
+    end
   end
 
   context 'an existing user' do