/// <summary>
/// Deserialize the relations for a relation type.
/// </summary>
private IEnumerable <uSyncChange> DeserializeRelations(XElement node, IRelationType relationType, SyncSerializerOptions options)
{
var changes = new List <uSyncChange>();
var existing = relationService
.GetAllRelationsByRelationType(relationType.Id)
.ToList();
var relations = node.Element("Relations");
// do we do this, or do we remove them all!
if (relations == null)
{
return(Enumerable.Empty <uSyncChange>());
}
var newRelations = new List <string>();
foreach (var relationNode in relations.Elements("Relation"))
{
var parentKey = relationNode.Element("Parent").ValueOrDefault(Guid.Empty);
var childKey = relationNode.Element("Child").ValueOrDefault(Guid.Empty);
if (parentKey == Guid.Empty || childKey == Guid.Empty)
{
continue;
}
var parentItem = entityService.Get(parentKey);
var childItem = entityService.Get(childKey);
if (parentItem == null || childItem == null)
{
continue;
}
if (!existing.Any(x => x.ParentId == parentItem.Id && x.ChildId == childItem.Id))
{
// missing from the current list... add it.
relationService.Save(new Relation(parentItem.Id, childItem.Id, relationType));
changes.Add(uSyncChange.Create(relationType.Alias, parentItem.Name, childItem.Name));
}
newRelations.Add($"{parentItem.Id}_{childItem.Id}");
}
if (options.DeleteItems())
{
var obsolete = existing.Where(x => !newRelations.Contains($"{x.ParentId}_{x.ChildId}"));
foreach (var obsoleteRelation in obsolete)
{
changes.Add(uSyncChange.Delete(relationType.Alias, obsoleteRelation.ParentId.ToString(), obsoleteRelation.ChildId.ToString()));
relationService.Delete(obsoleteRelation);
}
}
return(changes);
}