Simplify the code with Forwardable, leave object_id and __send__ methods

lib/batch_loader.rb

@@ -1,12 +1,16 @@
 # frozen_string_literal: true
 
 require "set"
+require "forwardable"
+
 require "batch_loader/version"
 require "batch_loader/executor_proxy"
 require "batch_loader/middleware"
 require "batch_loader/graphql"
 
 class BatchLoader
+  extend Forwardable
+
   NoBatchError = Class.new(StandardError)
 
   def self.for(item)
@@ -74,15 +78,11 @@ class << self
   end
 
   def replace_with!(value)
-    BatchLoader.send(:without_warnings) do
-      ignore_method_names = %i[singleton_method_added].freeze
-      singleton_class.class_eval do
-        (value.methods - ignore_method_names).each do |method_name|
-          define_method(method_name) do |*args, &block|
-            value.public_send(method_name, *args, &block)
-          end
-        end
-      end
+    @loaded_value = value
+
+    singleton_class.class_eval do
+      ignore_method_names = %i[object_id __send__ singleton_method_added].freeze
+      def_delegators :@loaded_value, *(value.methods - ignore_method_names)
     end
   end
 
@@ -98,19 +98,6 @@ def executor_proxy
     end
   end
 
-  class << self
-    private
-
-    def without_warnings(&block)
-      warning_level = $VERBOSE
-      $VERBOSE = nil
-      block.call
-      $VERBOSE = warning_level
-    end
-  end
-
-  without_warnings do
-    leave_method_names = %i[batch batch_loader? respond_to?].freeze
-    (instance_methods - leave_method_names).each { |method_name| undef_method(method_name) }
-  end
+  leave_method_names = %i[object_id __send__ batch batch_loader? respond_to?].freeze
+  (instance_methods - leave_method_names).each { |method_name| undef_method(method_name) }
 end

spec/benchmarks/loading.rb

@@ -31,11 +31,11 @@
 # with BatchLoader without cache 1.000  i/100ms
 
 # Calculating -------------------------------------
-# without BatchLoader            965.088k (±15.1%) i/s - 3.399M   in 3.864552s
-# with BatchLoader with cache    991.089k (± 8.0%) i/s - 3.272M
-# with BatchLoader without cache 75.239k (±18.1%) i/s  - 345.350k in 4.883875s
+# without BatchLoader            939.708k (±19.2%) i/s - 3.241M   in 3.907448s
+# with BatchLoader with cache    990.611k (± 8.3%) i/s - 3.283M
+# with BatchLoader without cache 76.292k (±18.0%) i/s  - 350.402k in 4.886185s
 
 # Comparison:
-# with BatchLoader with cache:    991089.2 i/s
-# without BatchLoader:            965088.1 i/s - same-ish: difference falls within error
-# with BatchLoader without cache: 75238.7 i/s  - 13.17x slower
+# with BatchLoader with cache:    990611.0 i/s
+# without BatchLoader:            939708.2 i/s - same-ish: difference falls within error
+# with BatchLoader without cache: 76292.0 i/s  - 12.98x  slower