Added: Custom Rails controller resource test.

test/contrib/rails/apps/controllers.rb

@@ -88,6 +88,12 @@ def full
     @value = Rails.cache.write('empty-key', 50)
     render 'views/tracing/full.html.erb'
   end
+
+  def custom_resource
+    tracer = Datadog.configuration[:rails][:tracer]
+    tracer.active_span.resource = 'custom-resource'
+    head :ok
+  end
 end
 
 routes = {
@@ -102,7 +108,8 @@ def full
   '/error_template' => 'tracing#error_template',
   '/error_partial' => 'tracing#error_partial',
   '/missing_template' => 'tracing#missing_template',
-  '/missing_partial' => 'tracing#missing_partial'
+  '/missing_partial' => 'tracing#missing_partial',
+  '/custom_resource' => 'tracing#custom_resource'
 }
 
 if Rails.version >= '3.2.22.5'

test/contrib/rails/controller_test.rb

@@ -179,6 +179,17 @@ class TracingControllerTest < ActionController::TestCase
     assert_nil(span.get_tag('error.stack'), 'no error stack')
   end
 
+  test 'custom resource names can be set' do
+    get :custom_resource
+    assert_response :success
+    spans = @tracer.writer.spans
+    assert_equal(spans.length, 1)
+
+    spans.first.tap do |span|
+      assert_equal('custom-resource', span.resource)
+    end
+  end
+
   test 'combining rails and custom tracing is supported' do
     @tracer.trace('a-parent') do
       get :index