feat: remove deprecated tracing syntax

lib/trailblazer/rails/controller.rb

@@ -3,7 +3,7 @@ module Controller
     # TODO: deprecate {*dependencies}.
     def run_v21(operation, *dependencies, **variables, &block)
       result = if Rails.application.config.trailblazer.enable_tracing
-                 _run_operation_v21(operation, :trace, *dependencies, **variables).tap { |r| _operation_trace(r) }
+                 _run_operation_v21(operation, :wtf?, *dependencies, **variables)
                else
                  _run_operation_v21(operation, :call, *dependencies, **variables)
                end
@@ -53,10 +53,6 @@ def _run_operation_v21(operation, call_method, *dependencies, **variables)
       )
     end
 
-    def _operation_trace(result)
-      puts result.wtf?
-    end
-
     def _assign_trb_ivars(result)
       @model = result[:model]
       @form  = _wrap_with_trb_form(result["contract.default"], @model.class)

test/integration/songs_controller_test.rb

@@ -2,6 +2,22 @@
 require 'minitest/capybara'
 
 class SongsControllerTest < Minitest::Capybara::Spec
+  it 'can trace' do
+    # Capture the standard output
+    stdout = StringIO.new
+    original_stdout = $stdout
+    $stdout = stdout
+    Rails.application.config.trailblazer.enable_tracing = true
+    visit "/songs/new"
+    # Assert that the output contains the expected string
+    assert_equal "Song::Operation::New\n|-- \e[32mStart.default\e[0m\n|-- \e[32mmodel.build\e[0m\n|-- \e[32mcontract.build\e[0m\n`-- End.success\n",
+      stdout.string
+
+  ensure
+    $stdout = original_stdout
+    Rails.application.config.trailblazer.enable_tracing = false
+  end
+
   it "new" do
     visit "/songs/new"
     assert page.has_css? "form.new_song[action='/songs']"