public virtual bool Copy(object srcEntity, EntityEntry destEntry)
{
bool modified = false;
foreach (PropertyEntry property in destEntry.Properties)
{
if (!(property.Metadata.FieldInfo == null ||
property.Metadata.IsPrimaryKey() ||
property.Metadata.IsForeignKey() ||
property.Metadata.BeforeSaveBehavior == PropertySaveBehavior.Ignore || //IsStoreGeneratedAlways ||
property.Metadata.AfterSaveBehavior == PropertySaveBehavior.Throw || //IsReadOnlyAfterSave ||
property.Metadata.IsIgnored()))
{
IClrPropertyGetter getter = property.Metadata.GetGetter();
object srcValue = getter.GetClrValue(srcEntity);
if (srcValue != property.CurrentValue)
{
if (!_eventManager.OnPropertyChanging(property, srcValue).Cancel)
{
property.CurrentValue = srcValue;
_eventManager.OnPropertyChanged(property, srcValue);
modified = true;
}
}
}
}
return(modified);
}
private static T GetValueFromEntity <T>(IClrPropertyGetter clrPropertyGetter, object entity)
{
if (entity == null)
{
return(default(T));
}
return((T)clrPropertyGetter.GetClrValue(entity));
}
/// <inheritdoc />
public override void IncludeCollection <TEntity, TRelated, TElement>(
int includeId,
INavigation navigation,
INavigation inverseNavigation,
IEntityType targetEntityType,
IClrCollectionAccessor clrCollectionAccessor,
IClrPropertySetter inverseClrPropertySetter,
bool tracking,
TEntity entity,
Func <IEnumerable <TRelated> > relatedEntitiesFactory,
Func <TEntity, TRelated, bool> joinPredicate)
{
Check.NotNull(clrCollectionAccessor, nameof(clrCollectionAccessor));
Check.NotNull(inverseNavigation, nameof(inverseNavigation));
Check.NotNull(inverseClrPropertySetter, nameof(inverseClrPropertySetter));
ICollection <TRelated> collection = (ICollection <TRelated>)clrCollectionAccessor
.GetOrCreate(entity);
IClrPropertyGetter primaryKeyPropertyGetter = inverseNavigation
.DeclaringEntityType
.FindPrimaryKey()
.Properties
.Single()
.GetGetter();
IEnumerable <(TRelated, TRelated)> relatedEntities = relatedEntitiesFactory()
.Join(collection,
related => primaryKeyPropertyGetter.GetClrValue(related),
related => primaryKeyPropertyGetter.GetClrValue(related),
(related, original) => (related, original))
.ToList();
foreach ((TRelated related, TRelated original) in relatedEntities)
{
collection.Remove(original);
collection.Add(related);
inverseClrPropertySetter.SetClrValue(related, entity);
}
}
public void Get(object instance, object[] result, ref int offset)
{
object entity = _entityGetter.GetClrValue(instance);
if (entity == null)
{
throw new Exception("");
}
foreach (IClrPropertyGetter getter in _keyGetters)
{
result[offset] = getter.GetClrValue(entity);
offset++;
}
}
private static void TryAddArgumentFromSource(
ResolveFieldContext resolveFieldContext,
string argument,
IClrPropertyGetter getter)
{
if (resolveFieldContext.Arguments == null)
{
resolveFieldContext.Arguments = new Dictionary <string, object>();
}
var value = getter.GetClrValue(resolveFieldContext.Source);
Debug.Assert(value != null);
resolveFieldContext.Arguments[argument] = value;
}
public void Get(object instance, object[] result, ref int offset)
{
result[offset] = _keyGetter.GetClrValue(instance);
offset++;
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public override void AddDbParameter(DbCommand command, object?value)
{
Check.DebugAssert(value != null, "value is null");
base.AddDbParameter(command, _clrPropertyGetter.GetClrValue(value));
}
public override void AddDbParameter(DbCommand command, object value)
{
Debug.Assert(value != null);
base.AddDbParameter(command, _clrPropertyGetter.GetClrValue(value));
}
protected virtual EntityEntry Merge(object detached, object persisted, NavigationEntry parentNavigation, HashSet <object> visited)
{
_eventManager.OnEntityMerging(detached, persisted, parentNavigation);
EntityEntry persistedEntry = _entryServices.FindEntry(persisted) ?? _dbContext.Entry(persisted);
visited.Add(persistedEntry.Entity);
bool modified = Copy(detached, persistedEntry);
foreach (NavigationEntry navigationEntry in persistedEntry.Navigations)
{
bool owned = navigationEntry.Metadata.IsOwned();
bool associated = navigationEntry.Metadata.IsAssociated();
if (!(associated || owned))
{
continue;
}
IEntityType navType = navigationEntry.Metadata.GetTargetType();
IClrPropertyGetter getter = navigationEntry.Metadata.GetGetter();
object detachedValue = getter.GetClrValue(detached);
IEntityServices entityServices = _entityServicesFactory.GetEntityServices(navType);
if (navigationEntry.Metadata.IsCollection())
{
// a mutable list to store the result.
IList mergedList = Activator.CreateInstance(typeof(List <>).MakeGenericType(navType.ClrType)) as IList;
// create hash table for O(N) merge.
Dictionary <KeyValue, object> dbTable = entityServices.CreateTable((IEnumerable)navigationEntry.CurrentValue);
if (detachedValue != null)
{
foreach (var detachedItem in (IEnumerable)detachedValue)
{
object persistedItem;
KeyValue entityKey = entityServices.GetKeyValue(detachedItem);
if (dbTable.TryGetValue(entityKey, out persistedItem))
{
mergedList.Add(owned
? Merge(detachedItem, persistedItem, navigationEntry, visited).Entity
: persistedItem);
dbTable.Remove(entityKey); // remove it from the table, to avoid deletion.
}
else
{
mergedList.Add(owned ? Add(detachedItem, navigationEntry, visited).Entity
: Attach(detachedItem, navigationEntry).Entity);
}
}
}
// the rest of the items in the dbTable should be removed.
foreach (var dbItem in dbTable)
{
Delete(dbItem.Value, navigationEntry, visited);
}
// let EF do the rest of the work.
navigationEntry.CurrentValue = mergedList;
}
else
{
if (visited.Contains(navigationEntry.CurrentValue))
{
continue;
}
if (entityServices.Equal(detachedValue, navigationEntry.CurrentValue))
{
// merge owned references and do nothing for associated references.
if (owned)
{
navigationEntry.CurrentValue = Merge(detachedValue, navigationEntry.CurrentValue, navigationEntry, visited).Entity;
}
}
else
{
if (navigationEntry.CurrentValue != null)
{
if (owned)
{
Delete(navigationEntry.CurrentValue, navigationEntry, visited);
}
}
if (detachedValue != null)
{
navigationEntry.CurrentValue = owned ?
Add(detachedValue, navigationEntry, visited).Entity :
Attach(detachedValue, navigationEntry).Entity;
}
else
{
// fix: if we use lazy loading we can delete correct value
// for example: [FK] ItemId -> Item (is null)
// ItemId = 1 (from RESTfull for example), Item = null
var fk = navigationEntry.Metadata.ForeignKey?.Properties?.SingleOrDefault();
var data = fk?.GetGetter().GetClrValue(detached);
if (data != null && data.GetType().IsPrimitive&& !data.GetType().IsDefaultValue(data))
{
continue;
}
navigationEntry.CurrentValue = null;
}
}
}
}
return(_eventManager.OnEntityMerged(detached, persistedEntry, modified, parentNavigation).EntityEntry);
}
/// <inheritdoc />
public override void IncludeCollection <TEntity, TRelated, TElement>(
int includeId,
INavigation navigation,
INavigation inverseNavigation,
IEntityType targetEntityType,
IClrCollectionAccessor clrCollectionAccessor,
IClrPropertySetter inverseClrPropertySetter,
bool tracking,
TEntity entity,
Func <IEnumerable <TRelated> > relatedEntitiesFactory,
Func <TEntity, TRelated, bool> joinPredicate)
{
Check.NotNull(clrCollectionAccessor, nameof(clrCollectionAccessor));
Check.NotNull(inverseNavigation, nameof(inverseNavigation));
Check.NotNull(inverseClrPropertySetter, nameof(inverseClrPropertySetter));
ICollection <TRelated> collection = (ICollection <TRelated>)clrCollectionAccessor
.GetOrCreate(entity);
IClrPropertyGetter primaryKeyPropertyGetter = navigation
.GetTargetType()
.FindPrimaryKey()
.Properties
.Single()
.GetGetter();
IDictionary <object, TRelated> replacementMap = relatedEntitiesFactory()
.ToDictionary(
related => primaryKeyPropertyGetter.GetClrValue(related));
IEnumerable <object> newCollectionItems = collection
.Select(original =>
replacementMap.TryGetValue(
primaryKeyPropertyGetter.GetClrValue(original),
out TRelated related)
? related
: original)
.Cast <object>()
.ToList();
collection.Clear();
foreach (TRelated item in newCollectionItems)
{
inverseClrPropertySetter.SetClrValue(item, entity);
if (tracking)
{
InternalEntityEntry originalEntry = _stateManager.TryGetEntry(item);
if (originalEntry != null)
{
_stateManager.StopTracking(originalEntry);
}
base.StartTracking(
LoadEntity(
item,
targetEntityType,
entity,
inverseNavigation),
targetEntityType);
}
}
}
protected virtual EntityEntry Merge(object detached, object persisted, NavigationEntry parentNavigation, HashSet <object> visited)
{
var args = _eventManager.OnEntityMerging(detached, persisted, parentNavigation);
EntityEntry persistedEntry = _entryServices.FindEntry(persisted);
if (persistedEntry == null)
{
persistedEntry = _dbContext.Entry(persisted);
}
visited.Add(persistedEntry.Entity);
bool modified = Copy(detached, persistedEntry);
foreach (NavigationEntry navigationEntry in persistedEntry.Navigations)
{
bool owned = navigationEntry.Metadata.IsOwned();
bool associated = navigationEntry.Metadata.IsAssociated();
if (!(associated || owned))
{
continue;
}
IEntityType navType = navigationEntry.Metadata.GetTargetType();
IClrPropertyGetter getter = navigationEntry.Metadata.GetGetter();
object detachedValue = getter.GetClrValue(detached);
IEntityServices entityServices = _entityServicesFactory.GetEntityServices(navType);
if (navigationEntry.Metadata.IsCollection())
{
// a mutable list to store the result.
IList mergedList = Activator.CreateInstance(typeof(List <>).MakeGenericType(navType.ClrType)) as IList;
// create hash table for O(N) merge.
Dictionary <KeyValue, object> dbTable = entityServices.CreateTable((IEnumerable)navigationEntry.CurrentValue);
if (detachedValue != null)
{
foreach (object detachedItem in (IEnumerable)detachedValue)
{
object persistedItem;
KeyValue entityKey = entityServices.GetKeyValue(detachedItem);
if (dbTable.TryGetValue(entityKey, out persistedItem))
{
if (owned)
{
mergedList.Add(Merge(detachedItem, persistedItem, navigationEntry, visited).Entity);
}
else
{
mergedList.Add(persistedItem);
}
dbTable.Remove(entityKey); // remove it from the table, to avoid deletion.
}
else
{
mergedList.Add(owned ? Add(detachedItem, navigationEntry, visited).Entity
: Attach(detachedItem, navigationEntry).Entity);
}
}
}
// the rest of the items in the dbTable should be removed.
foreach (var dbItem in dbTable)
{
Delete(dbItem.Value, navigationEntry, visited);
}
// let EF do the rest of the work.
navigationEntry.CurrentValue = mergedList;
}
else
{
if (!visited.Contains(navigationEntry.CurrentValue)) // avoid stack overflow! (this might be also done checking if the property is dependent to parent)
{
if (entityServices.Equal(detachedValue, navigationEntry.CurrentValue))
{
// merge owned references and do nothing for associated references.
if (owned)
{
navigationEntry.CurrentValue = Merge(detachedValue, navigationEntry.CurrentValue, navigationEntry, visited).Entity;
}
}
else
{
if (navigationEntry.CurrentValue != null)
{
if (owned)
{
Delete(navigationEntry.CurrentValue, navigationEntry, visited);
}
}
if (detachedValue != null)
{
if (owned)
{
navigationEntry.CurrentValue = Add(detachedValue, navigationEntry, visited).Entity;
}
else
{
navigationEntry.CurrentValue = Attach(detachedValue, navigationEntry).Entity;
}
}
else
{
navigationEntry.CurrentValue = null;
}
}
}
}
}
return(_eventManager.OnEntityMerged(detached, persistedEntry, modified, parentNavigation).EntityEntry);
}