Fix for missing service when importing from EE to CE

Signed-off-by: Rémy Coutable <remy@rymai.me>

changelogs/unreleased/fix-import-export-ee-services.yml

+---
+title: Fix missing service error importing from EE to CE
+merge_request: 8144
+author:

lib/gitlab/import_export/project_tree_restorer.rb

@@ -120,7 +120,7 @@ module Gitlab
                                                        members_mapper: members_mapper,
                                                        user: @user,
                                                        project_id: restored_project.id)
-        end
+        end.compact
         relation_hash_list.is_a?(Array) ? relation_array : relation_array.first
       end

lib/gitlab/import_export/relation_factory.rb

@@ -40,6 +40,8 @@ module Gitlab
       # the relation_hash, updating references with new object IDs, mapping users using
       # the "members_mapper" object, also updating notes if required.
       def create
+        return nil if unknown_service?
+
         setup_models
         generate_imported_object
@@ -217,6 +219,11 @@ module Gitlab
             existing_object
           end
       end
+
+      def unknown_service?
+        @relation_name == :services && parsed_relation_hash['type'] &&
+          !Object.const_defined?(parsed_relation_hash['type'])
+      end
     end
   end
 end

spec/lib/gitlab/import_export/project.json

@@ -7411,6 +7411,28 @@
       "category": "common",
       "default": false,
       "wiki_page_events": true
+    },
+    {
+      "id": 101,
+      "title": "JenkinsDeprecated",
+      "project_id": 5,
+      "created_at": "2016-06-14T15:01:51.031Z",
+      "updated_at": "2016-06-14T15:01:51.031Z",
+      "active": false,
+      "properties": {
+
+      },
+      "template": false,
+      "push_events": true,
+      "issues_events": true,
+      "merge_requests_events": true,
+      "tag_push_events": true,
+      "note_events": true,
+      "build_events": true,
+      "category": "common",
+      "default": false,
+      "wiki_page_events": true,
+      "type": "JenkinsDeprecatedService"
     }
   ],
   "hooks": [