gistfile1.txt

var units = imageMetadata.Units.Some() ? imageMetadata.Units : new Dictionary<string, int>();
var ratePlans = imageMetadata.RatePlans.Some() ? imageMetadata.RatePlans : new Dictionary<string, int>();
var relatedDocuments = units.Concat(ratePlans);

var patchCommands = new List<ScriptedPatchCommandData>();
foreach (var relatedDocument in relatedDocuments)
{
	var photo = new Photo
	{
		Url = imageMetadata.Id,
		Title = imageMetadata.Title,
		Description = imageMetadata.Description,
		SortOrder = relatedDocument.Value,
	};

	patchCommands.Add(new ScriptedPatchCommandData
	{
		Key = relatedDocument.Key,
		Patch = new ScriptedPatchRequest()
		{
			Script = @"
			if(!_.has(this, 'Photos')) {
				_.extend(this, { 'Photos': []});
			}

      this.Photos.RemoveWhere(function(photo) {
				return photo.Url === url;
      });

			this.Photos.push(newPhoto);",
			Values =
			{
				{"url", imageMetadata.Id},
				{"newPhoto", RavenJObject.FromObject(photo)}
			}
		}
	});
}

_session.Advanced.GetDatabaseCommands().Batch(patchCommands);