Do not import legacy triggers from project JSON

lib/gitlab/import_export/relation_factory.rb

@@ -78,6 +78,9 @@ module Gitlab
       def create
         return if unknown_service?
 
+        # Do not import legacy triggers
+        return if !Feature.enabled?(:use_legacy_pipeline_triggers, @project) && legacy_trigger?
+
         setup_models
 
         generate_imported_object
@@ -278,6 +281,10 @@ module Gitlab
           !Object.const_defined?(parsed_relation_hash['type'])
       end
 
+      def legacy_trigger?
+        @relation_name == 'Ci::Trigger' && @relation_hash['owner_id'].nil?
+      end
+
       def find_or_create_object!
         return relation_class.find_or_create_by(project_id: @project.id) if @relation_name == :project_feature
 

spec/lib/gitlab/import_export/project.json

@@ -6633,6 +6633,13 @@
       "owner_id": 1,
       "created_at": "2017-01-16T15:25:28.637Z",
       "updated_at": "2017-01-16T15:25:28.637Z"
+    },
+    {
+      "id": 456,
+      "token": "33a66349b5ad01fc00174af87804e40",
+      "project_id": 5,
+      "created_at": "2017-01-16T15:25:29.637Z",
+      "updated_at": "2017-01-16T15:25:29.637Z"
     }
   ],
   "deploy_keys": [],

spec/lib/gitlab/import_export/project_tree_restorer_spec.rb

@@ -32,6 +32,10 @@ describe Gitlab::ImportExport::ProjectTreeRestorer do
     end
 
     context 'JSON' do
+      before do
+        stub_feature_flags(use_legacy_pipeline_triggers: false)
+      end
+
       it 'restores models based on JSON' do
         expect(@restored_project_json).to be_truthy
       end
@@ -198,8 +202,9 @@ describe Gitlab::ImportExport::ProjectTreeRestorer do
       end
 
       context 'tokens are regenerated' do
-        it 'has a new CI trigger token' do
-          expect(Ci::Trigger.where(token: 'cdbfasdf44a5958c83654733449e585')).to be_empty
+        it 'has new CI trigger tokens' do
+          expect(Ci::Trigger.where(token: %w[cdbfasdf44a5958c83654733449e585 33a66349b5ad01fc00174af87804e40]))
+            .to be_empty
         end
 
         it 'has a new CI build token' do
@@ -212,7 +217,7 @@ describe Gitlab::ImportExport::ProjectTreeRestorer do
           expect(@project.merge_requests.size).to eq(9)
         end
 
-        it 'has the correct number of triggers' do
+        it 'only restores valid triggers' do
           expect(@project.triggers.size).to eq(1)
         end