refactor code once again to fix IID issues

lib/gitlab/import_export/group_project_finder.rb

@@ -31,7 +31,9 @@ module Gitlab
       private
 
       def where_clause
-        @attributes.except(:group, :project).map do |key, value|
+        return { project_id: @project.id } unless milestone? || label?
+
+        @attributes.slice(:title).map do |key, value|
           project_clause = table[key].eq(value).and(table[:project_id].eq(@project.id))
 
           if @group
@@ -48,13 +50,36 @@ module Gitlab
 
       def project_attributes
         @attributes.except(:group).tap do |atts|
-          atts['type'] = 'ProjectLabel' if label?
+          if label?
+            atts['type'] = 'ProjectLabel'
+          elsif milestone?
+            if atts['group_id']
+              atts['iid'] = nil
+              atts.delete('group_id')
+            else
+              claim_iid
+            end
+          end
         end
       end
 
       def label?
         @klass == Label || @klass < Label
       end
+
+      def milestone?
+        @klass == Milestone
+      end
+
+      def claim_iid
+        group_milestone = @project.milestones.find_by(iid: @attributes['iid'])
+
+        group_milestone.update!(iid: max_milestone_iid + 1) if group_milestone
+      end
+
+      def max_milestone_iid
+        [@attributes['iid'], @project.milestones.maximum(:iid)].compact.max
+      end
     end
   end
 end

lib/gitlab/import_export/relation_factory.rb

@@ -257,15 +257,7 @@ module Gitlab
       end
 
       def existing_object
-        @existing_object ||=
-          begin
-            existing_object = find_or_create_object!
-
-            # Done in two steps, as MySQL behaves differently than PostgreSQL using
-            # the +find_or_create_by+ method and does not return the ID the second time.
-            existing_object.update!(parsed_relation_hash)
-            existing_object
-          end
+        @existing_object ||= find_or_create_object!
       end
 
       def unknown_service?
@@ -275,29 +267,17 @@ module Gitlab
 
       def find_or_create_object!
         # Can't use IDs as validation exists calilng `.group` or `.project`
-        finder_hash = { project: @project }.tap do |hash|
+        finder_hash = parsed_relation_hash.tap do |hash|
           hash[:group] = @project.group if relation_class.attribute_method?('group_id')
+          hash[:project] = @project
           hash[:title] = parsed_relation_hash['title'] if parsed_relation_hash['title']
+          hash.delete('project_id')
         end
 
         if label?
-          label = GroupProjectFinder.find_or_new(Label, finder_hash)
-          parsed_relation_hash.delete('priorities') if label.persisted?
-          parsed_relation_hash.delete('type')
-
-          label.save!
-          label
+          GroupProjectFinder.find_or_new(Label, finder_hash)
         else
-          object = GroupProjectFinder.find_or_create(relation_class, finder_hash)
-
-          if milestone?
-            parsed_relation_hash.delete('group_id') if object.project
-            parsed_relation_hash.delete('project_id') if object.group
-            parsed_relation_hash.delete('iid')
-            parsed_relation_hash.delete('id')
-          end
-
-          object
+          GroupProjectFinder.find_or_create(relation_class, finder_hash)
         end
       end
 

spec/lib/gitlab/import_export/group_project_finder_spec.rb

@@ -16,15 +16,15 @@ describe Gitlab::ImportExport::GroupProjectFinder do
 
       expect(described_class.find_or_new(Label,
                                          title: 'group label',
-                                         'project_id' => project.id,
-                                         'group_id' => project.group.id)).to eq(group_label)
+                                         project: project,
+                                         group: project.group)).to eq(group_label)
     end
 
     it 'initializes a new label' do
       label = described_class.find_or_new(Label,
                                           title: 'group label',
-                                          'project_id' => project.id,
-                                          'group_id' => project.group.id)
+                                          project: project,
+                                          group: project.group)
 
       expect(label.persisted?).to be false
     end
@@ -32,8 +32,8 @@ describe Gitlab::ImportExport::GroupProjectFinder do
     it 'creates a new label' do
       label = described_class.find_or_create(Label,
                                              title: 'group label',
-                                             'project_id' => project.id,
-                                             'group_id' => project.group.id)
+                                             project: project,
+                                             group: project.group)
 
       expect(label.persisted?).to be true
     end
@@ -45,24 +45,24 @@ describe Gitlab::ImportExport::GroupProjectFinder do
 
       expect(described_class.find_or_new(Milestone,
                                          title: 'group milestone',
-                                         'project_id' => project.id,
-                                         'group_id' => project.group.id)).to eq(milestone)
+                                         project: project,
+                                         group: project.group)).to eq(milestone)
     end
 
     it 'initializes a new milestone' do
       milestone = described_class.find_or_new(Milestone,
-                                          title: 'group milestone',
-                                          'project_id' => project.id,
-                                          'group_id' => project.group.id)
+                                              title: 'group milestone',
+                                              project: project,
+                                              group: project.group)
 
       expect(milestone.persisted?).to be false
     end
 
     it 'creates a new milestone' do
       milestone = described_class.find_or_create(Milestone,
-                                             title: 'group milestone',
-                                             'project_id' => project.id,
-                                             'group_id' => project.group.id)
+                                                 title: 'group milestone',
+                                                 project: project,
+                                                 group: project.group)
 
       expect(milestone.persisted?).to be true
     end