1 files changed, 11 insertions, 4 deletions
diff --git a/activerecord/lib/active_record/query_cache.rb b/activerecord/lib/active_record/query_cache.rb
index 28194c7c46..43a21e629e 100644
--- a/activerecord/lib/active_record/query_cache.rb
+++ b/activerecord/lib/active_record/query_cache.rb
@@ -26,15 +26,22 @@ module ActiveRecord
     end
 
     def self.run
-      ActiveRecord::Base.connection_handler.connection_pool_list.
-        reject { |p| p.query_cache_enabled }.each { |p| p.enable_query_cache! }
+      pools = []
+
+      ActiveRecord::Base.connection_handlers.each do |key, handler|
+        pools << handler.connection_pool_list.reject { |p| p.query_cache_enabled }.each { |p| p.enable_query_cache! }
+      end
+
+      pools.flatten
     end
 
     def self.complete(pools)
       pools.each { |pool| pool.disable_query_cache! }
 
-      ActiveRecord::Base.connection_handler.connection_pool_list.each do |pool|
-        pool.release_connection if pool.active_connection? && !pool.connection.transaction_open?
+      ActiveRecord::Base.connection_handlers.each do |_, handler|
+        handler.connection_pool_list.each do |pool|
+          pool.release_connection if pool.active_connection? && !pool.connection.transaction_open?
+        end
       end
     end