Add related data field

You can add relations to content items through the UI by adding a Related data custom field. For more information, see Add a Related data custom field.

Related data fields can also be added to static modules using the following code:

using System;
using System.Collections.Generic;
using Telerik.Sitefinity.Model;
using Telerik.Sitefinity.ModuleEditor.Web.Services.Model;
using Telerik.Sitefinity.Modules.News.Web.UI;
using Telerik.Sitefinity.News.Model;
using Telerik.Sitefinity.Services;
using Telerik.Sitefinity.Utilities.TypeConverters;
using Telerik.Sitefinity.Web.UI.Fields;

namespace SitefinityWebApp
{
   public class AddRelatedDataField
   {
       public void AddField(string contentTypeFullName, string fieldName)
       {
           Type contentType = TypeResolutionService.ResolveType(contentTypeFullName);
           var customFieldContext = new CustomFieldsContext(contentType);
           UserFriendlyDataType userFriendlyDataType = UserFriendlyDataType.RelatedData;
           var field = new WcfField()
           {
               Name = fieldName,
               ContentType = contentTypeFullName,
               FieldTypeKey = userFriendlyDataType.ToString(),
               IsCustom = true,

               //Field definition
               Definition = new WcfFieldDefinition()
               {
                   Title = fieldName,
                   FieldName = fieldName,
                   FieldType = typeof(RelatedDataField).FullName,
                   AllowMultipleSelection = true,
                   FrontendWidgetTypeName = typeof(NewsView).FullName, //For Example: news view added for a frontend widget
                   RelatedDataProvider = string.Empty,
                   RelatedDataType = typeof(NewsItem).FullName //For Example: news item added as related data type
               }
           };
           Dictionary<string, WcfField> relatedDataFields = new Dictionary<string, WcfField>();
           relatedDataFields.Add(fieldName, field);

           customFieldContext.AddOrUpdateCustomFields(relatedDataFields, contentType.Name);
           customFieldContext.SaveChanges();

           //The soft restart of Sitefinity CMS is needed in order to add the recently added custom fields to OA context
           // SystemManager.RestartApplication(false); -- This is obsolete

           // This is from the documentation: https://docs.sitefinity.com/for-developers-application-restart
           //  SystemManager.RestartApplication("Restart invoked through the Sitefinity CMS API", SystemRestartFlags.Default, true);

       }
   }
}

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Add News as related data field