/// <summary>
/// Loads the navigation collection.
/// </summary>
/// <param name="entityEntry">The entity entry.</param>
/// <param name="navigation">The navigation.</param>
/// <param name="context">The context.</param>
protected virtual void LoadCollection(EntityEntry entityEntry, IConventionNavigation navigation, DbContext context)
{
var foreignKeyProperty = navigation.ForeignKey.Properties[0];
var loadStatusAware = navigation.GetGetter().GetClrValue(entityEntry.Entity) as ILoadingStatusAwareList;
if (loadStatusAware?.LoadingStatus == LoadingStatus.Loaded || loadStatusAware?.LoadingStatus == LoadingStatus.Loading)
{
// already loaded or loading
return;
}
if (loadStatusAware is null && navigation.GetGetter().GetClrValue(entityEntry.Entity) != null)
{
// already loaded or loading
return;
}
if (loadStatusAware is null)
{
throw new InvalidOperationException($"The collection is not implementing {nameof(ILoadingStatusAware)}");
}
loadStatusAware.LoadingStatus = LoadingStatus.Loading;
if (this.RepositoryManager.GetRepository(foreignKeyProperty.DeclaringEntityType.ClrType) is ILoadByProperty repository)
{
var foreignKeyValue = entityEntry.Property(navigation.ForeignKey.PrincipalKey.Properties[0].Name).CurrentValue;
var items = repository.LoadByProperty(foreignKeyProperty, foreignKeyValue);
foreach (var obj in items)
{
if (!loadStatusAware.Contains(obj))
{
loadStatusAware.Add(obj);
}
}
loadStatusAware.LoadingStatus = LoadingStatus.Loaded;
}
else
{
this.logger.LogWarning($"No repository found which supports loading by foreign key for type ${foreignKeyProperty.DeclaringEntityType.ClrType}.");
loadStatusAware.LoadingStatus = LoadingStatus.Failed;
}
}
/// <summary>
/// Loads the data navigation property and sets it in the entity.
/// </summary>
/// <param name="entityEntry">The entity entry from the context.</param>
/// <param name="navigation">The navigation property.</param>
protected virtual void LoadNavigationProperty(EntityEntry entityEntry, IConventionNavigation navigation)
{
if (navigation.ForeignKey.DeclaringEntityType != navigation.DeclaringEntityType)
{
// inverse property
return;
}
var keyProperty = navigation.ForeignKey.Properties[0];
var idValue = entityEntry.Property(keyProperty.Name).CurrentValue;
Guid id = (idValue as Guid?) ?? Guid.Empty;
if (id != Guid.Empty)
{
var getter = navigation.GetGetter();
var currentValue = getter.GetClrValue(entityEntry.Entity);
if (currentValue is IIdentifiable identifiable && identifiable.Id == id)
{
// loaded already
return;
}
IRepository?repository = null;
try
{
repository = this.RepositoryManager.GetRepository(navigation.TargetEntityType.ClrType);
}
catch (RepositoryNotFoundException ex)
{
this.logger.LogError(ex, $"Repository not found: {ex.Message}");
}
if (repository != null)
{
#pragma warning disable EF1001 // Internal EF Core API usage.
if (navigation is Navigation {
Setter : { }
} concreteNavigation)
{
concreteNavigation.Setter.SetClrValue(entityEntry.Entity, repository.GetById(id));
}
else
{
this.logger.LogError($"Could not find setter for navigation {navigation}");
}
#pragma warning restore EF1001 // Internal EF Core API usage.
}
else
{
this.logger.LogError($"Repository not found for navigation target type {navigation.TargetEntityType}.");
}
}