Enable non-unique node names based on parent content type in Umbraco v9

CustomDocumentRepository.cs

public class CustomDocumentRepository : DocumentRepository
    {
        private static readonly string[] allowNonUniqueChildNames = { EventsPage.ModelTypeAlias, NewsPage.ModelTypeAlias };

        public CustomDocumentRepository(
            IScopeAccessor scopeAccessor,
            AppCaches appCaches,
            ILogger<DocumentRepository> logger,
            ILoggerFactory loggerFactory,
            IContentTypeRepository contentTypeRepository,
            ITemplateRepository templateRepository,
            ITagRepository tagRepository,
            ILanguageRepository languageRepository,
            IRelationRepository relationRepository,
            IRelationTypeRepository relationTypeRepository,
            PropertyEditorCollection propertyEditors,
            DataValueReferenceFactoryCollection dataValueReferenceFactories,
            IDataTypeService dataTypeService,
            IJsonSerializer serializer,
            IEventAggregator eventAggregator) : base(scopeAccessor, appCaches, logger, loggerFactory, contentTypeRepository, templateRepository, tagRepository, languageRepository, relationRepository, relationTypeRepository, propertyEditors, dataValueReferenceFactories, dataTypeService, serializer, eventAggregator)
        {
        }

        protected override string EnsureUniqueNodeName(int parentId, string nodeName, int id = 0)
        {
            var parent = this.Get(parentId);

            if (allowNonUniqueChildNames.InvariantContains(parent.ContentType.Alias))
            {
                return nodeName;
            }
            
            return base.EnsureUniqueNodeName(parentId, nodeName, id);
        }
    }