From 02a3f0ab34aa06d014821c0a6988bfac0b6dd471 Mon Sep 17 00:00:00 2001
From: Yasuo Honda <yasuo.honda@gmail.com>
Date: Tue, 16 Apr 2024 21:11:55 +0900
Subject: [PATCH] Use OpenStruct only if available

This commit uses OpenStruct only if available because of the following reasons:

- Starting from Ruby 3.4.0dev, Using `ostruct` raises the following warning.
> ostruct was loaded from the standard library, but will no longer be part of the default gems since Ruby 3.5.0. Add ostruct to your Gemfile or gemspec.

- And when the warning category is `:performance` it also raises this warning.
> "OpenStruct use is discouraged for performance reasons

Refer to
https://bugs.ruby-lang.org/issues/20309
https://github.com/ruby/ruby/pull/10428
https://github.com/ruby/ostruct/pull/56
Fix #561
---
 lib/jbuilder.rb | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/jbuilder.rb b/lib/jbuilder.rb
index 3cf41d8..b6258c7 100644
--- a/lib/jbuilder.rb
+++ b/lib/jbuilder.rb
@@ -4,8 +4,11 @@
 require 'jbuilder/key_formatter'
 require 'jbuilder/errors'
 require 'json'
-require 'ostruct'
 require 'active_support/core_ext/hash/deep_merge'
+begin
+  require 'ostruct'
+rescue LoadError
+end
 
 class Jbuilder
   @@key_formatter = nil
@@ -28,7 +31,7 @@ def self.encode(*args, &block)
   end
 
   BLANK = Blank.new
-  NON_ENUMERABLES = [ ::Struct, ::OpenStruct ].to_set
+  NON_ENUMERABLES = defined?(::OpenStruct) ? [::Struct, ::OpenStruct].to_set : [::Struct].to_set
 
   def set!(key, value = BLANK, *args, &block)
     result = if ::Kernel.block_given?