Direct access to recursive traversal methods

app/models/namespaces/traversal/recursive.rb

@@ -22,6 +22,7 @@ module Namespaces
         object_hierarchy(self.class.where(id: id))
           .all_objects
       end
+      alias_method :recursive_self_and_hierarchy, :self_and_hierarchy
 
       # Returns all the ancestors of the current namespaces.
       def ancestors
@@ -30,6 +31,7 @@ module Namespaces
         object_hierarchy(self.class.where(id: parent_id))
           .base_and_ancestors
       end
+      alias_method :recursive_ancestors, :ancestors
 
       # returns all ancestors upto but excluding the given namespace
       # when no namespace is given, all ancestors upto the top are returned
@@ -44,17 +46,20 @@ module Namespaces
         object_hierarchy(self.class.where(id: id))
           .base_and_ancestors(hierarchy_order: hierarchy_order)
       end
+      alias_method :recursive_self_and_ancestors, :self_and_ancestors
 
       # Returns all the descendants of the current namespace.
       def descendants
         object_hierarchy(self.class.where(parent_id: id))
           .base_and_descendants
       end
+      alias_method :recursive_descendants, :descendants
 
       def self_and_descendants
         object_hierarchy(self.class.where(id: id))
           .base_and_descendants
       end
+      alias_method :recursive_self_and_descendants, :self_and_descendants
 
       def object_hierarchy(ancestors_base)
         Gitlab::ObjectHierarchy.new(ancestors_base, options: { use_distinct: Feature.enabled?(:use_distinct_in_object_hierarchy, self) })

ee/app/finders/epics_finder.rb

@@ -162,7 +162,7 @@ class EpicsFinder < IssuableFinder
     elsif include_ancestors
       group.self_and_ancestors
     elsif include_descendants
-      group.self_and_descendants
+      group.recursive_self_and_descendants
     else
       Group.id_in(group.id)
     end

spec/support/shared_examples/namespaces/namespace_traversal_examples.rb

 # frozen_string_literal: true
 
 RSpec.shared_examples 'namespace traversal' do
+  shared_examples 'recursive version' do |method|
+    let(:recursive_method) { "recursive_#{method}" }
+
+    it "is equivalent to ##{method}" do
+      groups.each do |group|
+        expect(group.public_send(method)).to match_array group.public_send(recursive_method)
+      end
+    end
+
+    it "makes a recursive query" do
+      groups.each do |group|
+        expect { group.public_send(recursive_method).load }.to make_queries_matching(/WITH RECURSIVE/)
+      end
+    end
+  end
+
   describe '#self_and_hierarchy' do
     let!(:group) { create(:group, path: 'git_lab') }
     let!(:nested_group) { create(:group, parent: group) }
@@ -14,6 +30,12 @@ RSpec.shared_examples 'namespace traversal' do
       expect(nested_group.self_and_hierarchy).to contain_exactly(group, nested_group, deep_nested_group, very_deep_nested_group)
       expect(very_deep_nested_group.self_and_hierarchy).to contain_exactly(group, nested_group, deep_nested_group, very_deep_nested_group)
     end
+
+    describe '#recursive_self_and_hierarchy' do
+      let(:groups) { [group, nested_group, very_deep_nested_group] }
+
+      it_behaves_like 'recursive version', :self_and_hierarchy
+    end
   end
 
   describe '#ancestors' do
@@ -28,6 +50,12 @@ RSpec.shared_examples 'namespace traversal' do
       expect(nested_group.ancestors).to include(group)
       expect(group.ancestors).to eq([])
     end
+
+    describe '#recursive_ancestors' do
+      let(:groups) { [nested_group, deep_nested_group, very_deep_nested_group] }
+
+      it_behaves_like 'recursive version', :ancestors
+    end
   end
 
   describe '#self_and_ancestors' do
@@ -42,6 +70,12 @@ RSpec.shared_examples 'namespace traversal' do
       expect(nested_group.self_and_ancestors).to contain_exactly(group, nested_group)
       expect(group.self_and_ancestors).to contain_exactly(group)
     end
+
+    describe '#recursive_self_and_ancestors' do
+      let(:groups) { [nested_group, deep_nested_group, very_deep_nested_group] }
+
+      it_behaves_like 'recursive version', :self_and_ancestors
+    end
   end
 
   describe '#descendants' do
@@ -58,6 +92,12 @@ RSpec.shared_examples 'namespace traversal' do
       expect(nested_group.descendants.to_a).to include(deep_nested_group, very_deep_nested_group)
       expect(group.descendants.to_a).to include(nested_group, deep_nested_group, very_deep_nested_group)
     end
+
+    describe '#recursive_descendants' do
+      let(:groups) { [group, nested_group, deep_nested_group, very_deep_nested_group] }
+
+      it_behaves_like 'recursive version', :descendants
+    end
   end
 
   describe '#self_and_descendants' do
@@ -74,5 +114,11 @@ RSpec.shared_examples 'namespace traversal' do
       expect(nested_group.self_and_descendants).to contain_exactly(nested_group, deep_nested_group, very_deep_nested_group)
       expect(group.self_and_descendants).to contain_exactly(group, nested_group, deep_nested_group, very_deep_nested_group)
     end
+
+    describe '#recursive_self_and_descendants' do
+      let(:groups) { [group, nested_group, deep_nested_group, very_deep_nested_group] }
+
+      it_behaves_like 'recursive version', :self_and_descendants
+    end
   end
 end