Removed unused ext module.

Author: dblock

CHANGELOG.md

@@ -9,6 +9,7 @@
 * [#157](https://github.com/slack-ruby/slack-ruby-bot-server/pull/157): Added test env setup guide for linux users - [@crazyoptimist](https://github.com/crazyoptimist).
 * [#158](https://github.com/slack-ruby/slack-ruby-bot-server/pull/158): Replace `cursor_pagination` with `pagy_cursor` - [@crazyoptimist](https://github.com/crazyoptimist).
 * [#160](https://github.com/slack-ruby/slack-ruby-bot-server/pull/160): Document upgrading to 2.0.0 - [@crazyoptimist](https://github.com/crazyoptimist).
+* [#161](https://github.com/slack-ruby/slack-ruby-bot-server/pull/161): Removed unused `ext` module - [@dblock](https://github.com/dblock).
 * Your contribution here.
 
 #### 1.2.1 (2022/03/06)

lib/slack-ruby-bot-server/ext.rb

@@ -1,3 +1,2 @@
-%w[bson/object_id grape/sort_extension].each do |ext|
-  require_relative "ext/#{ext}"
-end
+require_relative 'ext/bson/object_id'
+require_relative 'ext/grape/sort_extension'

lib/slack-ruby-bot-server/ext/bson/object_id.rb

@@ -1,12 +1,14 @@
 # see https://groups.google.com/forum/#!msg/mongoid/MaXFVw7D_4s/T3sl6Flg428J
-module BSON
-  class ObjectId
-    def as_json(_options = {})
-      to_s
-    end
+if defined?(:BSON)
+  module BSON
+    class ObjectId
+      def as_json(_options = {})
+        to_s
+      end
 
-    def to_bson_key(encoded = ''.force_encoding(BINARY))
-      to_s.to_bson_key(encoded)
+      def to_bson_key(encoded = ''.force_encoding(BINARY))
+        to_s.to_bson_key(encoded)
+      end
     end
   end
 end