Fix ordering by VMs in NetworkManagers list

Fix ordering by VMs in NetworkManagers list

Fixes BZ:
https://bugzilla.redhat.com/show_bug.cgi?id=1383307

app/models/manageiq/providers/network_manager.rb

@@ -25,6 +25,21 @@ class << model_name
  has_many :load_balancer_health_checks, :foreign_key => :ems_id, :dependent => :destroy
  has_many :load_balancer_health_check_members, :through => :load_balancer_health_checks
 
+ # Generates ORDER BY ((SELECT COUNT(*) FROM "vms" WHERE "ext_management_systems"."parent_ems_id" = "vms"."ems_id"))
+ # So unlike the parent class definition, this looks at "ext_management_systems"."parent_ems_id" instead of
+ # "ext_management_systems"."id"
+ # If we are able to define a has_many :vms, :through => :parent_manager, that does actual join, this code should
+ # not be needed.
+ virtual_total :total_vms, :vms, {
+ :arel => lambda do |t|
+ foreign_table = Vm.arel_table
+ local_key = :parent_ems_id
+ foreign_key = :ems_id
+ arel_column = Arel.star.count
+ t.grouping(foreign_table.project(arel_column).where(t[local_key].eq(foreign_table[foreign_key])))
+ end
+ }
+
  alias all_cloud_networks cloud_networks
 
  belongs_to :parent_manager,