Fix physical switches be removed after the refresh

app/models/ems_refresh/save_inventory_infra.rb

@@ -78,7 +78,7 @@ def save_ems_infra_inventory(ems, hashes, target = nil, disconnect = true)
 
  new_relats = hashes_relats(hashes)
  link_ems_inventory(ems, target, prev_relats, new_relats, disconnect)
- remove_obsolete_switches
+ remove_obsolete_switches(ems.switches)
 
  ems
  end
@@ -331,10 +331,11 @@ def save_switches_inventory(host, hashes)
  host.switches.delete(deletes)
  end
 
- def remove_obsolete_switches
+ def remove_obsolete_switches(switches)
  # delete from switches as s where s.shared is NULL and s.id not in (select switch_id from host_switches)
  # delete from switches as s where s.shared = 't' and s.id not in (select switch_id from host_switches)
- Switch.where.not(:id => HostSwitch.all.collect(&:switch).uniq).destroy_all
+ switch_ids = HostSwitch.all.collect(&:switch_id)
+ switches.where.not(:id => switch_ids).destroy_all
  end
 
  def save_lans_inventory(switch, hashes)