Add compatibility for .trace_with in graphql-ruby 2.3+

Author: janko

docs/graphql.asciidoc

@@ -18,6 +18,6 @@ To enable GraphQL support, add the included Tracer to your schema:
 class MySchema < GraphQL::Schema
   # ...
 
-  tracer ElasticAPM::GraphQL # <-- include this
+  trace_with ElasticAPM::GraphQL # <-- include this
 end
 ----

lib/elastic_apm/graphql.rb

@@ -48,6 +48,14 @@ module GraphQL
       # "authorized" => "graphql.authorized",
     }.freeze
 
+    KEYS_TO_NAME.each_key do |trace_method|
+      module_eval <<-RUBY, __FILE__, __LINE__
+      def #{trace_method}(**data)
+        ::ElasticAPM::GraphQL.trace("#{trace_method}", data) { super }
+      end
+      RUBY
+    end
+
     # rubocop:disable Style/ExplicitBlockArgument
     def self.trace(key, data)
       return yield unless KEYS_TO_NAME.key?(key)

spec/integration/graphql_spec.rb

@@ -95,7 +95,7 @@ def post(slug:)
 
         class GraphQLTestAppSchema < GraphQL::Schema
           query QueryType
-          tracer ElasticAPM::GraphQL
+          trace_with ElasticAPM::GraphQL
         end
       end