Fix deprecated use of ActiveSupport::Deprecation singleton instance

Author: padde

CHANGELOG.md

@@ -1,5 +1,6 @@
 ### 0.5.1 (Next)
 
+* [TODO](https://github.com/ruby-grape/grape-swagger-rails/pull/TODO): Rails 7 compatibility - [@padde](https://github.com/padde).
 * Your contribution here.
 
 ### 0.5.0 (2024/04/06)

lib/grape-swagger-rails.rb

@@ -6,8 +6,8 @@
 module GrapeSwaggerRails
   class Options < OpenStruct
     def before_filter(&block)
-      ActiveSupport::Deprecation.warn('This option is deprecated and going to be removed in 1.0.0. ' \
-                                      'Please use `before_action` instead')
+      GrapeSwaggerRails.deprecator.warn('This option is deprecated and going to be removed in 1.0.0. ' \
+                                        'Please use `before_action` instead')
       before_action(&block)
     end
 
@@ -43,4 +43,8 @@ def before_action(&block)
     hide_url_input: false,
     hide_api_key_input: false
   )
+
+  def self.deprecator
+    @deprecator ||= ActiveSupport::Deprecation.new('1.0', 'GrapeSwaggerRails')
+  end
 end

spec/features/swagger_spec.rb

@@ -171,14 +171,16 @@
 
     describe '#before_filter' do
       before do
-        allow(ActiveSupport::Deprecation).to receive(:warn)
+        allow(GrapeSwaggerRails.deprecator).to receive(:warn)
       end
 
       it 'throws deprecation warning' do
         GrapeSwaggerRails.options.before_filter { true }
 
-        expect(ActiveSupport::Deprecation).to have_received(:warn).with('This option is deprecated ' \
-                                                                        'and going to be removed in 1.0.0. Please use `before_action` instead')
+        expect(GrapeSwaggerRails.deprecator).to have_received(:warn).with(
+          'This option is deprecated and going to be removed in 1.0.0. ' \
+          'Please use `before_action` instead'
+        )
       end
     end