Merge pull request #11435 from kennyj/move_to_query_cache

Move initializing process for @query_cache to QueryCache module.

activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb

@@ -20,6 +20,12 @@ def #{method_name}(*)                         # def update_with_query_dirty(*)
 
       attr_reader :query_cache, :query_cache_enabled
 
+      def initialize(*)
+        super
+        @query_cache         = Hash.new { |h,sql| h[sql] = {} }
+        @query_cache_enabled = false
+      end
+
       # Enable the query cache within the block.
       def cache
         old, @query_cache_enabled = @query_cache_enabled, true

activerecord/lib/active_record/connection_adapters/abstract_adapter.rb

@@ -95,8 +95,6 @@ def initialize(connection, logger = nil, pool = nil) #:nodoc:
         @last_use            = false
         @logger              = logger
         @pool                = pool
-        @query_cache         = Hash.new { |h,sql| h[sql] = {} }
-        @query_cache_enabled = false
         @schema_cache        = SchemaCache.new self
         @visitor             = nil
       end