Do not omit nil results using graphql_dig_at

spec/graphql/types/base_edge_spec.rb

@@ -71,6 +71,6 @@ RSpec.describe Types::BaseEdge do
       .to contain_exactly(member_project.name, maintainer_project.name, public_project.name)
 
     expect(graphql_dig_at(result, 'data', 'projects', 'edges', 'proofOfAdminRights'))
-      .to contain_exactly('ok')
+      .to contain_exactly(nil, 'ok', nil)
   end
 end

spec/requests/api/graphql/packages/package_spec.rb

@@ -68,7 +68,7 @@ RSpec.describe 'package details' do
         subject
 
         expect(graphql_data_at(:package, :versions, :nodes, :version)).to be_present
-        expect(graphql_data_at(:package, :versions, :nodes, :versions, :nodes)).to be_empty
+        expect(graphql_data_at(:package, :versions, :nodes, :versions, :nodes)).to eq [nil, nil]
       end
     end
   end

spec/support/helpers/graphql_helpers.rb

@@ -515,7 +515,10 @@ module GraphqlHelpers
     # ['project', 'boards', 'edges', 0, 'node', 'lists']
     keys.reduce(data) do |memo, key|
       if memo.is_a?(Array)
-        key.is_a?(Integer) ? memo[key] : memo.flat_map { |e| Array.wrap(e[key]) }
+        key.is_a?(Integer) ? memo[key] : memo.compact.flat_map do |e|
+          x = e[key]
+          x.nil? ? [x] : Array.wrap(x)
+        end
       else
         memo&.dig(key)
       end

spec/support/shared_examples/requests/api/graphql/packages/group_and_project_packages_list_shared_examples.rb

@@ -55,7 +55,7 @@ RSpec.shared_examples 'group and project packages query' do
     end
 
     it 'deals with metadata' do
-      expect(target_shas).to contain_exactly(composer_metadatum.target_sha)
+      expect(target_shas.compact).to contain_exactly(composer_metadatum.target_sha)
     end
 
     it 'returns the count of the packages' do

spec/support_specs/helpers/graphql_helpers_spec.rb

@@ -43,6 +43,21 @@ RSpec.describe GraphqlHelpers do
 
       expect(graphql_dig_at(data, :foo, :nodes, :bar, :nodes, :id)).to eq([1, 2, 3, 4])
     end
+
+    it 'does not omit nils at the leaves' do
+      data = {
+        'foo' => {
+          'nodes' => [
+            { 'bar' => { 'nodes' => [{ 'id' => nil }, { 'id' => 2 }] } },
+            { 'bar' => { 'nodes' => [{ 'id' => 3 }, { 'id' => nil }] } },
+            { 'bar' => nil }
+          ]
+        },
+        'irrelevant' => 'the field is a red-herring'
+      }
+
+      expect(graphql_dig_at(data, :foo, :nodes, :bar, :nodes, :id)).to eq([nil, 2, 3, nil])
+    end
   end
 
   describe 'var' do