Fix project import to group when there are project milestones

changelogs/unreleased/issue_35580.yml

+---
+title: Fix project milestones import when projects belongs to a group
+merge_request:
+author:

lib/gitlab/import_export/project_tree_restorer.rb

 module Gitlab
   module ImportExport
     class ProjectTreeRestorer
+      # Relations which cannot have both group_id and project_id at the same time
+      RESTRICT_PROJECT_AND_GROUP = %i(milestones).freeze
+
       def initialize(user:, shared:, project:)
         @path = File.join(shared.export_path, 'project.json')
         @user = user
@@ -118,9 +121,11 @@ module Gitlab
       end
 
       def create_relation(relation, relation_hash_list)
+        relation_type = relation.to_sym
+
         relation_array = [relation_hash_list].flatten.map do |relation_hash|
-          Gitlab::ImportExport::RelationFactory.create(relation_sym: relation.to_sym,
-                                                       relation_hash: parsed_relation_hash(relation_hash),
+          Gitlab::ImportExport::RelationFactory.create(relation_sym: relation_type,
+                                                       relation_hash: parsed_relation_hash(relation_hash, relation_type),
                                                        members_mapper: members_mapper,
                                                        user: @user,
                                                        project: restored_project)
@@ -129,8 +134,16 @@ module Gitlab
         relation_hash_list.is_a?(Array) ? relation_array : relation_array.first
       end
 
-      def parsed_relation_hash(relation_hash)
-        relation_hash.merge!('group_id' => restored_project.group.try(:id), 'project_id' => restored_project.id)
+      def parsed_relation_hash(relation_hash, relation_type)
+        if RESTRICT_PROJECT_AND_GROUP.include?(relation_type)
+          params = {}
+          params['group_id'] = restored_project.group.try(:id) if relation_hash['group_id']
+          params['project_id'] = restored_project.id if relation_hash['project_id']
+        else
+          params = { 'group_id' => restored_project.group.try(:id), 'project_id' => restored_project.id }
+        end
+
+        relation_hash.merge(params)
       end
     end
   end

spec/lib/gitlab/import_export/project.light.json

@@ -2,6 +2,20 @@
   "description": "Nisi et repellendus ut enim quo accusamus vel magnam.",
   "visibility_level": 10,
   "archived": false,
+  "milestones": [
+    {
+      "id": 1,
+      "title": "test milestone",
+      "project_id": 8,
+      "description": "test milestone",
+      "due_date": null,
+      "created_at": "2016-06-14T15:02:04.415Z",
+      "updated_at": "2016-06-14T15:02:04.415Z",
+      "state": "active",
+      "iid": 1,
+      "group_id": null
+    }
+  ],
   "labels": [
     {
       "id": 2,
@@ -13,20 +27,6 @@
       "template": false,
       "description": "",
       "type": "ProjectLabel",
-      "priorities": [
-      ]
-    },
-    {
-      "id": 3,
-      "title": "test3",
-      "color": "#428bca",
-      "group_id": 8,
-      "created_at": "2016-07-22T08:55:44.161Z",
-      "updated_at": "2016-07-22T08:55:44.161Z",
-      "template": false,
-      "description": "",
-      "project_id": null,
-      "type": "GroupLabel",
       "priorities": [
         {
           "id": 1,
@@ -39,10 +39,80 @@
       ]
     }
   ],
+  "issues": [
+    {
+      "id": 1,
+      "title": "Fugiat est minima quae maxime non similique.",
+      "assignee_id": null,
+      "project_id": 8,
+      "author_id": 1,
+      "created_at": "2017-07-07T18:13:01.138Z",
+      "updated_at": "2017-08-15T18:37:40.807Z",
+      "branch_name": null,
+      "description": "Quam totam fuga numquam in eveniet.",
+      "state": "opened",
+      "iid": 20,
+      "updated_by_id": 1,
+      "confidential": false,
+      "deleted_at": null,
+      "due_date": null,
+      "moved_to_id": null,
+      "lock_version": null,
+      "time_estimate": 0,
+      "closed_at": null,
+      "last_edited_at": null,
+      "last_edited_by_id": null,
+      "group_milestone_id": null,
+      "label_links": [
+        {
+          "id": 11,
+          "label_id": 6,
+          "target_id": 1,
+          "target_type": "Issue",
+          "created_at": "2017-08-15T18:37:40.795Z",
+          "updated_at": "2017-08-15T18:37:40.795Z",
+          "label": {
+            "id": 6,
+            "title": "group label",
+            "color": "#A8D695",
+            "project_id": null,
+            "created_at": "2017-08-15T18:37:19.698Z",
+            "updated_at": "2017-08-15T18:37:19.698Z",
+            "template": false,
+            "description": "",
+            "group_id": 5,
+            "type": "GroupLabel",
+            "priorities": []
+          }
+        },
+        {
+          "id": 11,
+          "label_id": 2,
+          "target_id": 1,
+          "target_type": "Issue",
+          "created_at": "2017-08-15T18:37:40.795Z",
+          "updated_at": "2017-08-15T18:37:40.795Z",
+          "label": {
+            "id": 6,
+            "title": "project label",
+            "color": "#A8D695",
+            "project_id": null,
+            "created_at": "2017-08-15T18:37:19.698Z",
+            "updated_at": "2017-08-15T18:37:19.698Z",
+            "template": false,
+            "description": "",
+            "group_id": 5,
+            "type": "ProjectLabel",
+            "priorities": []
+          }
+        }
+      ]
+    }
+  ],
   "snippets": [
 
   ],
   "hooks": [
 
   ]
-}
+}
\ No newline at end of file

spec/lib/gitlab/import_export/project_tree_restorer_spec.rb

@@ -183,7 +183,8 @@ describe Gitlab::ImportExport::ProjectTreeRestorer do
     let(:restored_project_json) { project_tree_restorer.restore }
 
     before do
-      allow(ImportExport).to receive(:project_filename).and_return('project.light.json')
+      project_tree_restorer.instance_variable_set(:@path, "spec/lib/gitlab/import_export/project.light.json")
+
       allow(shared).to receive(:export_path).and_return('spec/lib/gitlab/import_export/')
     end
 
@@ -195,7 +196,7 @@ describe Gitlab::ImportExport::ProjectTreeRestorer do
 
           restored_project_json
 
-          expect(shared.errors.first).not_to include('test')
+          expect(shared.errors.first).to be_nil
         end
       end
     end
@@ -219,15 +220,42 @@ describe Gitlab::ImportExport::ProjectTreeRestorer do
       end
 
       before do
+        project_tree_restorer.instance_variable_set(:@path, "spec/lib/gitlab/import_export/project.light.json")
+
         restored_project_json
       end
 
-      it 'has group labels' do
-        expect(GroupLabel.count).to eq(1)
+      it 'correctly restores project' do
+        expect(restored_project_json).to be_truthy
+        expect(shared.errors).to be_empty
+      end
+
+      it 'has labels' do
+        expect(project.labels.count).to eq(2)
+      end
+
+      it 'creates group label' do
+        expect(project.group.labels.count).to eq(1)
       end
 
       it 'has label priorities' do
-        expect(GroupLabel.first.priorities).not_to be_empty
+        expect(project.labels.first.priorities).not_to be_empty
+      end
+
+      it 'has milestones' do
+        expect(project.milestones.count).to eq(1)
+      end
+
+      it 'has issue' do
+        expect(project.issues.count).to eq(1)
+        expect(project.issues.first.labels.count).to eq(2)
+      end
+
+      it 'has issue with group label and project label' do
+        labels = project.issues.first.labels
+
+        expect(labels.where(type: "GroupLabel").count).to eq(1)
+        expect(labels.where(type: "ProjectLabel").count).to eq(1)
       end
     end
   end