Fix assigning issues to users for Jira import

app/workers/gitlab/jira_import/import_issue_worker.rb

@@ -29,9 +29,11 @@ module Gitlab
 
       def create_issue(issue_attributes, project_id)
         label_ids = issue_attributes.delete('label_ids')
+        assignee_ids = issue_attributes.delete('assignee_ids')
         issue_id = insert_and_return_id(issue_attributes, Issue)
 
         label_issue(project_id, issue_id, label_ids)
+        assign_issue(project_id, issue_id, assignee_ids)
 
         issue_id
       end
@@ -49,6 +51,14 @@ module Gitlab
         Gitlab::Database.bulk_insert(LabelLink.table_name, label_link_attrs)
       end
 
+      def assign_issue(project_id, issue_id, assignee_ids)
+        return if assignee_ids.blank?
+
+        assignee_attrs = assignee_ids.map { |user_id| { issue_id: issue_id, user_id: user_id } }
+
+        Gitlab::Database.bulk_insert(IssueAssignee.table_name, assignee_attrs)
+      end
+
       def build_label_attrs(issue_id, label_id)
         time = Time.now
         {

spec/workers/gitlab/jira_import/import_issue_worker_spec.rb

@@ -19,9 +19,12 @@ describe Gitlab::JiraImport::ImportIssueWorker do
   subject { described_class.new }
 
   describe '#perform', :clean_gitlab_redis_cache do
+    let(:assignee_ids) { [user.id] }
     let(:issue_attrs) do
       build(:issue, project_id: project.id, title: 'jira issue')
-        .as_json.merge('label_ids' => [jira_issue_label_1.id, jira_issue_label_2.id]).compact
+        .as_json.merge(
+          'label_ids' => [jira_issue_label_1.id, jira_issue_label_2.id], 'assignee_ids' => assignee_ids
+        ).compact
     end
 
     context 'when any exception raised while inserting to DB' do
@@ -67,6 +70,23 @@ describe Gitlab::JiraImport::ImportIssueWorker do
           expect(issue.title).to eq('jira issue')
           expect(issue.project).to eq(project)
           expect(issue.labels).to match_array([label, jira_issue_label_1, jira_issue_label_2])
+          expect(issue.assignees).to eq([user])
+        end
+
+        context 'when assignee_ids is nil' do
+          let(:assignee_ids) { nil }
+
+          it 'creates an issue without assignee' do
+            expect(Issue.last.assignees).to be_empty
+          end
+        end
+
+        context 'when assignee_ids is an empty array' do
+          let(:assignee_ids) { [] }
+
+          it 'creates an issue without assignee' do
+            expect(Issue.last.assignees).to be_empty
+          end
         end
       end
     end