private Object unmarshall(PersistentEntity persistentEntity, Long id, Map<String, Object> data) {

    log.debug("unmarshalling entity {}, props {}, {}", id, data);
    EntityAccess entityAccess = new EntityAccess(persistentEntity, persistentEntity.newInstance());
    entityAccess.setConversionService(persistentEntity.getMappingContext().getConversionService());
    entityAccess.setIdentifier(id);
    data.remove("__id__");

    for (PersistentProperty property :
        entityAccess.getPersistentEntity().getPersistentProperties()) {

      String propertyName = property.getName();
      if (property instanceof Simple) { // implicitly sets version property as well
        entityAccess.setProperty(propertyName, data.remove(propertyName));
        //            } else if (property instanceof OneToOne) {
        //                log.error("property " + property.getName() + " is of type " +
        // property.getClass().getSuperclass());
      } else if (property instanceof ToOne) {
        ToOne to = (ToOne) property;

        CypherResult cypherResult =
            getSession()
                .getNativeInterface()
                .execute(
                    CypherBuilder.findRelationshipEndpointIdsFor(to),
                    Collections.singletonMap("id", id));

        Map<String, Object> row = IteratorUtil.singleOrNull(cypherResult);
        if (row != null) {
          Long endpointId = (Long) row.get("id");
          entityAccess.setProperty(
              propertyName,
              getMappingContext()
                  .getProxyFactory()
                  .createProxy(session, to.getAssociatedEntity().getJavaClass(), endpointId));
        }
      } else if ((property instanceof OneToMany) || (property instanceof ManyToMany)) {

        LazyEnititySet lazyEnititySet =
            new LazyEnititySet(
                entityAccess,
                (Association) property,
                getMappingContext().getProxyFactory(),
                getSession());
        entityAccess.setProperty(propertyName, lazyEnititySet);

      } else {
        throw new IllegalArgumentException(
            "property $property.name is of type ${property.class.superclass}");
      }
    }

    if (!data.isEmpty()) {
      GroovyObject go = (GroovyObject) (entityAccess.getEntity());
      go.setProperty(Neo4jGormEnhancer.UNDECLARED_PROPERTIES, data);
    }

    firePostLoadEvent(entityAccess.getPersistentEntity(), entityAccess);
    return entityAccess.getEntity();
  }
  private void persistAssociationsOfEntity(
      PersistentEntity pe, EntityAccess entityAccess, boolean isUpdate) {

    Object obj = entityAccess.getEntity();
    DirtyCheckable dirtyCheckable = null;
    if (obj instanceof DirtyCheckable) {
      dirtyCheckable = (DirtyCheckable) obj;
    }

    for (PersistentProperty pp : pe.getAssociations()) {
      if ((!isUpdate) || ((dirtyCheckable != null) && dirtyCheckable.hasChanged(pp.getName()))) {

        Object propertyValue = entityAccess.getProperty(pp.getName());

        if ((pp instanceof OneToMany) || (pp instanceof ManyToMany)) {
          Association association = (Association) pp;

          if (propertyValue != null) {

            if (association.isBidirectional()) { // Populate other side of bidi
              for (Object associatedObject : (Iterable) propertyValue) {
                EntityAccess assocEntityAccess =
                    createEntityAccess(association.getAssociatedEntity(), associatedObject);
                assocEntityAccess.setProperty(association.getReferencedPropertyName(), obj);
              }
            }

            Iterable targets = (Iterable) propertyValue;
            persistEntities(association.getAssociatedEntity(), targets);

            boolean reversed = RelationshipUtils.useReversedMappingFor(association);

            if (!reversed) {
              if (!(propertyValue instanceof LazyEnititySet)) {
                LazyEnititySet les =
                    new LazyEnititySet(
                        entityAccess,
                        association,
                        getMappingContext().getProxyFactory(),
                        getSession());
                les.addAll(targets);
                entityAccess.setProperty(association.getName(), les);
              }
            }
          }
        } else if (pp instanceof ToOne) {
          if (propertyValue != null) {
            ToOne to = (ToOne) pp;

            if (to.isBidirectional()) { // Populate other side of bidi
              EntityAccess assocEntityAccess =
                  createEntityAccess(to.getAssociatedEntity(), propertyValue);
              if (to instanceof OneToOne) {
                assocEntityAccess.setProperty(to.getReferencedPropertyName(), obj);
              } else {
                Collection collection =
                    (Collection) assocEntityAccess.getProperty(to.getReferencedPropertyName());
                if (collection == null) {
                  collection = new ArrayList();
                  assocEntityAccess.setProperty(to.getReferencedPropertyName(), collection);
                }
                if (!collection.contains(obj)) {
                  collection.add(obj);
                }
              }
            }

            persistEntity(to.getAssociatedEntity(), propertyValue);

            boolean reversed = RelationshipUtils.useReversedMappingFor(to);
            String relType = RelationshipUtils.relationshipTypeUsedFor(to);

            if (!reversed) {
              getSession()
                  .addPendingInsert(
                      new RelationshipPendingInsert(
                          entityAccess,
                          relType,
                          new EntityAccess(to.getAssociatedEntity(), propertyValue),
                          getCypherEngine()));
            }
          }
        } else {
          throw new IllegalArgumentException(
              "wtf don't know how to handle " + pp + "(" + pp.getClass() + ")");
        }
      }
    }
  }