Fixes namespace_id for user with no groups import

app/views/import/shared/_new_project_form.html.haml

@@ -15,7 +15,7 @@
           .input-group-prepend.static-namespace.has-tooltip{ title: user_url(current_user.username) + '/' }
             .input-group-text.border-0
               #{user_url(current_user.username)}/
-          = hidden_field_tag :namespace_id, value: current_user.namespace_id
+          = hidden_field_tag :namespace_id, current_user.namespace_id
   .form-group.col-12.col-sm-6.project-path
     = label_tag :path, _('Project slug'), class: 'label-bold'
     = text_field_tag :path, @path, placeholder: "my-awesome-project", class: "js-path-name form-control", tabindex: 2, required: true

changelogs/unreleased/cat-fix-namespaceid-import-39078.yml

+---
+title: Fixes project import failures when user is not part of any groups
+merge_request: 26038
+author:
+type: fixed

spec/views/import/gitlab_projects/new.html.haml_spec.rb

@@ -5,17 +5,18 @@ require 'spec_helper'
 describe 'import/gitlab_projects/new.html.haml' do
   include Devise::Test::ControllerHelpers
 
-  let(:user) { build_stubbed(:user, namespace: build_stubbed(:namespace)) }
+  let(:namespace) { build_stubbed(:namespace) }
+  let(:user) { build_stubbed(:user, namespace: namespace) }
 
   before do
     allow(view).to receive(:current_user).and_return(user)
   end
 
   context 'when the user has no other namespaces' do
-    it 'shows a namespace_id hidden field tag' do
+    it 'adds a namespace_id hidden field tag with the namespace id as value' do
       render
 
-      expect(rendered).to have_css('input[name="namespace_id"]', count: 1, visible: false)
+      expect(rendered).to have_css("input[name='namespace_id'][value='#{namespace.id}']", count: 1, visible: false)
     end
   end