/// <summary>
/// Gets all resource json:api relationships objects for the given CLR resource type.
/// </summary>
/// <typeparam name="TResource">Type of CLR resource or resource identifier to get relationships collection for.</typeparam>
/// <returns>Collection of <c>Relationships</c> objects in document order.</returns>
public static IEnumerable <Relationships> GetResourceRelationshipsCollection <TResource>(this IDocumentReader documentReader)
where TResource : class, IResource
{
Contract.Requires(documentReader != null);
var clrResourceType = typeof(TResource);
var apiResourceRelationshipsCollection = documentReader.GetResourceRelationshipsCollection(clrResourceType);
return(apiResourceRelationshipsCollection);
}