Ignore eager loading in Project.search UNION

The queries that are UNION'd together don't need any eager loading
(since we really only use the resulting SQL instead of having
ActiveRecord actually run the queries). By dropping any eager loaded
associations queries such as the following work instead of producing a
SQL error:

    Project.all.includes(:namespace).search('foo')

1 files changed, 6 insertions, 0 deletions

diff --git a/spec/models/project_spec.rb b/spec/models/project_spec.rb
index 59c5ffa6b9c..b8b9a455b83 100644
--- a/spec/models/project_spec.rb
+++ b/spec/models/project_spec.rb
@@ -634,6 +634,12 @@ describe Project, models: true do
     it 'returns projects with a matching namespace name regardless of the casing' do
       expect(described_class.search(project.namespace.name.upcase)).to eq([project])
     end
+
+    it 'returns projects when eager loading namespaces' do
+      relation = described_class.all.includes(:namespace)
+
+      expect(relation.search(project.namespace.name)).to eq([project])
+    end
   end
 
   describe '#rename_repo' do