Disable BatchLoader replace_methods by default

Method replacement is expensive on objects with a large number of
methods and the overhead of method_missing is small so we disable this
by default.

Changelog: performance

app/models/audit_event.rb

@@ -71,7 +71,7 @@ class AuditEvent < ApplicationRecord
   end
 
   def lazy_author
-    BatchLoader.for(author_id).batch(replace_methods: false) do |author_ids, loader|
+    BatchLoader.for(author_id).batch do |author_ids, loader|
       User.select(:id, :name, :username).where(id: author_ids).find_each do |user|
         loader.call(user.id, user)
       end

app/models/commit.rb

@@ -133,7 +133,7 @@ class Commit
     end
 
     def lazy(container, oid)
-      BatchLoader.for({ container: container, oid: oid }).batch(replace_methods: false) do |items, loader|
+      BatchLoader.for({ container: container, oid: oid }).batch do |items, loader|
         items_by_container = items.group_by { |i| i[:container] }
 
         items_by_container.each do |container, commit_ids|

app/models/concerns/avatarable.rb

@@ -110,7 +110,7 @@ module Avatarable
 
   def retrieve_upload_from_batch(identifier)
     BatchLoader.for(identifier: identifier, model: self)
-               .batch(key: self.class, cache: true, replace_methods: false) do |upload_params, loader, args|
+               .batch(key: self.class) do |upload_params, loader, args|
       model_class = args[:key]
       paths = upload_params.flat_map do |params|
         params[:model].upload_paths(params[:identifier])

app/models/project.rb

@@ -1791,7 +1791,7 @@ class Project < ApplicationRecord
   def open_issues_count(current_user = nil)
     return Projects::OpenIssuesCountService.new(self, current_user).count unless current_user.nil?
 
-    BatchLoader.for(self).batch(replace_methods: false) do |projects, loader|
+    BatchLoader.for(self).batch do |projects, loader|
       issues_count_per_project = ::Projects::BatchOpenIssuesCountService.new(projects).refresh_cache_and_retrieve_data
 
       issues_count_per_project.each do |project, count|
@@ -2256,7 +2256,7 @@ class Project < ApplicationRecord
 
   # rubocop: disable CodeReuse/ServiceClass
   def forks_count
-    BatchLoader.for(self).batch(replace_methods: false) do |projects, loader|
+    BatchLoader.for(self).batch do |projects, loader|
       fork_count_per_project = ::Projects::BatchForksCountService.new(projects).refresh_cache_and_retrieve_data
 
       fork_count_per_project.each do |project, count|

app/services/concerns/users/participable_service.rb

@@ -83,7 +83,7 @@ module Users
     end
 
     def lazy_user_availability(user)
-      BatchLoader.for(user.id).batch(replace_methods: false) do |user_ids, loader|
+      BatchLoader.for(user.id).batch do |user_ids, loader|
         user_ids.each_slice(1_000) do |sliced_user_ids|
           UserStatus
             .select(:user_id, :availability)

config/initializers/batch_loader.rb

 # frozen_string_literal: true
 
 Rails.application.config.middleware.use(BatchLoader::Middleware)
+
+# Disables replace_methods by default.
+# See https://github.com/exAspArk/batch-loader#replacing-methods for more information.
+module BatchLoaderWithoutMethodReplacementByDefault
+  def batch(replace_methods: false, **kw_args, &batch_block)
+    super
+  end
+end
+
+BatchLoader.prepend(BatchLoaderWithoutMethodReplacementByDefault)

ee/app/models/ee/audit_event.rb

@@ -47,7 +47,7 @@ module EE
     def lazy_entity
       BatchLoader.for(entity_id)
         .batch(
-          key: entity_type, default_value: ::Gitlab::Audit::NullEntity.new, replace_methods: false
+          key: entity_type, default_value: ::Gitlab::Audit::NullEntity.new
         ) do |ids, loader, args|
           model = Object.const_get(args[:key], false)
           model.where(id: ids).find_each { |record| loader.call(record.id, record) }

ee/app/models/vulnerabilities/finding.rb

@@ -153,7 +153,7 @@ module Vulnerabilities
     end
 
     def load_feedback
-      BatchLoader.for(finding_key).batch(replace_methods: false) do |finding_keys, loader|
+      BatchLoader.for(finding_key).batch do |finding_keys, loader|
         project_ids = finding_keys.map { |key| key[:project_id] }
         categories = finding_keys.map { |key| key[:category] }
         fingerprints = finding_keys.map { |key| key[:project_fingerprint] }

ee/lib/ee/gitlab/background_migration/populate_uuids_for_security_findings.rb

@@ -190,7 +190,7 @@ module EE
           scope :without_uuid, -> { where(uuid: nil) }
 
           def feedback
-            BatchLoader.for(finding_key).batch(replace_methods: false) do |finding_keys, loader|
+            BatchLoader.for(finding_key).batch do |finding_keys, loader|
               project_ids = finding_keys.map { |key| key[:project_id] }
               categories = finding_keys.map { |key| key[:category] }
               fingerprints = finding_keys.map { |key| key[:project_fingerprint] }

lib/api/entities/issuable_entity.rb

@@ -24,7 +24,7 @@ module API
       # entity according to the current top-level entity options, such
       # as the current_user.
       def lazy_issuable_metadata
-        BatchLoader.for(object).batch(key: [current_user, :issuable_metadata], replace_methods: false) do |models, loader, args|
+        BatchLoader.for(object).batch(key: [current_user, :issuable_metadata]) do |models, loader, args|
           current_user = args[:key].first
 
           issuable_metadata = Gitlab::IssuableMetadata.new(current_user, models)

lib/gitlab/background_migration/populate_finding_uuid_for_vulnerability_feedback.rb

@@ -38,7 +38,7 @@ module Gitlab
         end
 
         def vulnerability_finding
-          BatchLoader.for(finding_key).batch(replace_methods: false) do |finding_keys, loader|
+          BatchLoader.for(finding_key).batch do |finding_keys, loader|
             project_ids = finding_keys.map { |key| key[:project_id] }
             categories = finding_keys.map { |key| key[:category] }
             fingerprints = finding_keys.map { |key| key[:project_fingerprint] }