Make BodyProxy correctly delegate keyword arguments on Ruby 2.7+

3 files changed, 9 insertions, 0 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c5f5416e..59a8ba32 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -41,6 +41,7 @@ All notable changes to this project will be documented in this file. For info on
 
 ### Fixed
 
+- `BodyProxy` correctly delegates keyword arguments to the body object on Ruby 2.7+. ([@jeremyevans](https://github.com/jeremyevans))
 - `BodyProxy#method` correctly handles methods delegated to the body object. ([@jeremyevans](https://github.com/jeremyevans))
 - `Request#host` and `Request#host_with_port` handle IPv6 addresses correctly. ([@AlexWayfer](https://github.com/AlexWayfer))
 - `Lint` checks when response hijacking that `rack.hijack` is called with a valid object. ([@jeremyevans](https://github.com/jeremyevans))
diff --git a/lib/rack/body_proxy.rb b/lib/rack/body_proxy.rb
index 12347916..ebb7db39 100644
--- a/lib/rack/body_proxy.rb
+++ b/lib/rack/body_proxy.rb
@@ -29,5 +29,6 @@ module Rack
     def method_missing(method_name, *args, &block)
       @body.__send__(method_name, *args, &block)
     end
+    ruby2_keywords(:method_missing) if respond_to?(:ruby2_keywords, true)
   end
 end
diff --git a/test/spec_body_proxy.rb b/test/spec_body_proxy.rb
index fe70d2ef..1199f2f1 100644
--- a/test/spec_body_proxy.rb
+++ b/test/spec_body_proxy.rb
@@ -63,6 +63,13 @@ describe Rack::BodyProxy do
     proxy.method(:banana).call.must_equal :pear
   end
 
+  it 'allows calling delegated methods with keywords' do
+    body  = Object.new
+    def body.banana(foo: nil); foo end
+    proxy = Rack::BodyProxy.new(body) { }
+    proxy.banana(foo: 1).must_equal 1
+  end
+
   it 'not respond to :to_ary' do
     body = Object.new.tap { |o| def o.to_ary() end }
     body.respond_to?(:to_ary).must_equal true