add a test that demonstrates the change to the query on this branch supports the old params and the new v3 namespace params, and add the dirty flag for json column updates

lib/travis/api/v3/models/settings.rb

@@ -11,7 +11,8 @@ module Travis::API::V3
     end
 
     def update(settings = {})
-      repository.user_settings.update(settings)
+      repository.settings = repository.user_settings.update(settings).to_json
+      repository.settings_will_change!
       repository.save!
     end
   end

lib/travis/api/v3/query.rb

@@ -35,7 +35,7 @@ module Travis::API::V3
     @@prefixed_params_accessor = <<-RUBY
       def %<prefix>s_params
         @%<prefix>s ||= begin
-          params = @params.select { |key, _| key.start_with?('%<prefix>s.'.freeze) }
+          params.select { |key, _| key.start_with?('%<prefix>s.'.freeze) }
           Hash[params.map { |key, value| [key.split('.'.freeze).last, value] }]
         end
       end

spec/v3/services/settings_spec.rb

@@ -91,7 +91,7 @@ describe Travis::API::V3::Services::Settings, set_app: true do
     end
 
     describe 'authenticated, existing repo' do
-      let(:params) { JSON.dump('settings.build_pushes' => false) }
+      let(:params) { JSON.dump('settings.build_pushes' => false, 'maximum_number_of_builds' => 4) }
 
       before do
         repo.update_attributes(settings: JSON.dump('maximum_number_of_builds' => 20))
@@ -105,8 +105,9 @@ describe Travis::API::V3::Services::Settings, set_app: true do
           'builds_only_with_travis_yml' => false,
           'build_pushes' => false,
           'build_pull_requests' => true,
-          'maximum_number_of_builds' => 20
+          'maximum_number_of_builds' => 4
         )
+        expect(repo.reload.user_settings.maximum_number_of_builds).to eq(4)
       end
     end
   end