public Page <T> FindAll <T>(PageRequest r, Criteria criteria = null, RelationshipOption rOption = null)
{
var meta = _context.GetMetaData(typeof(T));
SetDefaultSortIfNotExist(r, meta);
var query = CypherTranslator.FindAll(meta, r, criteria);
using var session = NewSession();
return(session.ReadTransaction(tx =>
{
var records = tx.Run(query.Items).ToList();
var total = tx.Run(query.Count).Single()[0].As <long>();
var loadRelationship = ShouldLoadRelationship(rOption);
var items = EntityTransform.NewInstanceList(records, meta, iNode =>
{
var entity = EntityTransform.NewInstance(iNode, meta);
if (!loadRelationship)
{
return entity;
}
FetchRelationshipByNodeId(meta, entity, tx, rOption.Depth, new Dictionary <long, object>());
return entity;
}).As <IList <T> >();
return new Page <T>(r)
{
Items = items,
TotalItems = total
};
}));
}
public T FindById <T>(long id, RelationshipOption option = null)
{
var meta = _context.GetMetaData(typeof(T));
using var session = NewSession();
return(session.ReadTransaction(tx =>
{
var nodeRecord = tx.Run(CypherTranslator.FindNodeById(meta, id)).SingleOrDefault();
if (nodeRecord == null)
{
return default;
}
var entity = EntityTransform.NewInstance(nodeRecord, meta);
if (ShouldLoadRelationship(option))
{
FetchRelationshipByNodeId(meta, entity, tx, option.Depth, new Dictionary <long, object>());
}
return entity.As <T>();
}));
}
private void FetchRelationshipByNodeId(Meta meta, object entity, ITransaction tx, int depth, IDictionary <long, object> loaded)
{
if (depth == 0)
{
return;
}
var id = meta.GetId(entity).As <long>();
loaded.Add(id, entity);
foreach (var rp in meta.RelationshipProperties)
{
var rMeta = _context.GetMetaData(rp.EntityType);
var iRecords = tx.Run(CypherTranslator.FindRelationshipNodesById(meta, id, rp)).ToList();
if (iRecords.Count == 0)
{
continue;
}
var relatedEntityList = EntityTransform.NewInstanceList(iRecords, rMeta, iRecord =>
{
var iNode = iRecord[0].As <INode>();
// handle cycle relationship
if (loaded.TryGetValue(iNode.Id, out var exist))
{
return(exist);
}
var rEntity = EntityTransform.NewInstance(iNode, rMeta);
FetchRelationshipByNodeId(rMeta, rEntity, tx, depth - 1, loaded);
return(rEntity);
});
rp.SetValue(entity, rp.IsCollection ? relatedEntityList : relatedEntityList[0]);
}
}
