PageDataField Group Field Model

namespace Root.Core.Models.GlobalFields.PageData
{
    using System;
    using System.Collections.Generic;

    using Deliverystack.Core.Models.Repositories;

    using Root.Core.Models.Controls;
    using Root.Core.Models.Entries.Author;
    using Root.Core.Models.Fields;

    public class PageDataField
    {
        //require repository
        private PageDataField()
        {
        }

        public PageDataField(IRepository repository)
        {
            Repository = repository;
        }

        public IRepository Repository { get; set; }

        public string Title { get; set; }


        private string _shortTitle = null;

        public string ShortTitle
        {
            get
            {
                if (String.IsNullOrEmpty(_shortTitle))
                {
                    _shortTitle = Title;
                }

                return _shortTitle;
            }

            set
            {
                _shortTitle = value;
            }
        }
        public string Keywords { get; set; }
        public string Description { get; set; }

        public List<ReferenceField<AuthorEntry>> Authors { get; set; }
//public List<AuthorEntry> Authors { get; set; }

        // nullable to support deserialization of empty value
        public ChangeFrequency? ChangeFrequency { get; set; } = Controls.ChangeFrequency.Never;

        // nullable to support deserialization of empty value
        public double? Priority { get; set; } = double.MinValue;

        public bool ExcludeFromSitemap { get; set; }

        public string View { get; set; }

        public string PartialView { get; set; }
    }
}

//TODO: public List<Entry> Children { get; set; }

//TODO: Initialize() could do the following for all List<T> where T : EntryModel?

// alternative approach where Authors is List<AuthorEntry>
// in which case Entries have only UID and CTUID.
// to implement as a property, pass repository some other way

/*        public AuthorEntry[] GetAuthors(IRepository repository)
        {
            if (Authors == null || Authors.Count < 1)
            {
                return new AuthorEntry[0];
            }

            if (!_authorsFetched)
            {
                for (int i = 0; i < Authors.Count; i++)
                {
                    Authors[i] =
                        repository.Get<AuthorEntry>(Authors[i].EntryUid, Authors[i].ContentTypeUid);
                }
            }

            return Authors.ToArray();
        }*/