trigger_variables should consider trigger_request existstance always

app/models/ci/build.rb

@@ -221,14 +221,24 @@ module Ci
       variables += user_variables
       variables += project.group.secret_variables_for(ref, project).map(&:to_runner_variable) if project.group
       variables += secret_variables(environment: environment)
-      variables += trigger_request.user_variables if trigger_request
-      variables += pipeline.variables.map(&:to_runner_variable)
+      variables += trigger_variables
       variables += pipeline.pipeline_schedule.job_variables if pipeline.pipeline_schedule
       variables += persisted_environment_variables if environment
       variables
     end
+    def trigger_variables
+      return [] unless trigger_request # or pipeline.trigger?
+
+      @trigger_variables ||=
+        if pipeline.variables.any? # If it's swtiched to Ci::PipelineVariables
+          pipeline.variables.map(&:to_runner_variable)
+        else # else it's still using trigger_request.variables
+          trigger_request.user_variables # Deprecated
+        end
+    end
+
     def merge_request
       return @merge_request if defined?(@merge_request)

app/presenters/ci/build_presenter.rb

@@ -17,16 +17,5 @@ module Ci
         "Job is redundant and is auto-canceled by Pipeline ##{auto_canceled_by_id}"
       end
     end
-
-    def old_or_new_trigger_variables
-      return @old_or_new_trigger_variables if defined?(@old_or_new_trigger_variables)
-
-      if build.pipeline.variables.any?
-        @old_or_new_trigger_variables =
-          build.pipeline.variables&.map { |v| { v.key => v.value } } &.reduce({}, :merge)
-      else
-        @old_or_new_trigger_variables = build.trigger_request.variables
-      end
-    end
   end
 end

app/views/projects/jobs/_sidebar.html.haml

@@ -46,14 +46,14 @@
             %span.build-light-text Token:
             #{@build.trigger_request.trigger.short_token}
-          - if @build.old_or_new_trigger_variables
+          - if @build.trigger_variables.any?
             %p
               %button.btn.group.btn-group-justified.reveal-variables Reveal Variables
             %dl.js-build-variables.trigger-build-variables.hide
-              - @build.old_or_new_trigger_variables.each do |key, value|
-                %dt.js-build-variable.trigger-build-variable= key
-                %dd.js-build-value.trigger-build-value= value
+              - @build.trigger_variables.each do |trigger_variable|
+                %dt.js-build-variable.trigger-build-variable= trigger_variable[:key]
+                %dd.js-build-value.trigger-build-value= trigger_variable[:value]
       %div{ class: (@build.pipeline.stages_count > 1 ? "block" : "block-last") }
         %p

spec/models/ci/build_spec.rb

@@ -1690,6 +1690,44 @@ describe Ci::Build do
     end
   end
+  describe '#trigger_variables' do
+    let(:build) { create(:ci_build, pipeline: pipeline, trigger_request: trigger_request) }
+    let(:trigger) { create(:ci_trigger, project: project) }
+    let(:trigger_request) { create(:ci_trigger_request, pipeline: pipeline, trigger: trigger) }
+
+    subject { build.trigger_variables }
+
+    it { is_expected.to eq(true) }
+
+    context 'when variable is stored in ci_pipeline_variables' do
+      let!(:pipeline_variable) { create(:ci_pipeline_variable, pipeline: pipeline) }
+
+      context 'when pipeline is triggered by trigger API' do
+        it 'returns variables' do
+          is_expected.to eq([pipeline_variable.to_runner_variable])
+        end
+      end
+
+      context 'when pipeline is not triggered by trigger API' do
+        let(:build) { create(:ci_build, pipeline: pipeline) }
+
+        it 'does not return variables' do
+          is_expected.to eq([])
+        end
+      end
+    end
+
+    context 'when variable is stored in ci_trigger_requests.variables' do
+      before do
+        trigger_request.update_attribute(:variables, { 'TRIGGER_KEY_1' => 'TRIGGER_VALUE_1' } )
+      end
+
+      it 'returns variables' do
+        is_expected.to eq(trigger_request.user_variables)
+      end
+    end
+  end
+
   describe 'state transition: any => [:pending]' do
     let(:build) { create(:ci_build, :created) }