Merge pull request #20029 from jrafanie/pass_strings_to_where_classes…

…_not_class_objects

With rails 5.2, where clauses will no longer cast Class objects as Strings

(cherry picked from commit 346956c)

app/models/miq_report_result.rb

@@ -384,7 +384,7 @@ def self.with_current_user_groups
   end
 
   def self.with_chargeback
-    includes(:miq_report).where(:miq_reports => {:db => Chargeback.subclasses})
+    includes(:miq_report).where(:miq_reports => {:db => Chargeback.subclasses.collect(&:name)})
   end
 
   def self.with_saved_chargeback_reports(report_id = nil)