private async ValueTask <object> LoadNavigationSingleton(object principalInstance, INavigation navigation, byte cascadeLevel)
{
byte levelToLookFor = _whatDoing == CascadeSoftDelWhatDoing.SoftDelete
? (byte)0 //if soft deleting then look for un-deleted entries
: (byte)(cascadeLevel + 1); //otherwise look for next level up
//for everything else we need to load the singleton with a IgnoreQueryFilters method
var navValueType = navigation.PropertyInfo.PropertyType;
var genericHelperType =
typeof(GenericSingletonLoader <>).MakeGenericType(typeof(TInterface), navValueType);
dynamic loader = Activator.CreateInstance(genericHelperType, _context, _config, _isAsync,
principalInstance, navigation.PropertyInfo, levelToLookFor);
var navValueTask = loader.GetFilteredSingleton();
if (_isAsync)
{
return(await navValueTask);
}
return(ValueTaskSyncCheckers.CheckSyncValueTaskWorkedDynamicAndReturnResult <object>(navValueTask));
}
private async ValueTask <IEnumerable> LoadNavigationCollection(object principalInstance, INavigation navigation,
byte cascadeLevel)
{
byte levelToLookFor = _whatDoing == CascadeSoftDelWhatDoing.SoftDelete
? (byte)0 //if soft deleting then look for un-deleted entries
: (byte)(cascadeLevel + 1); //otherwise look for next level up
var navValueType = navigation.PropertyInfo.PropertyType;
var innerType = navValueType.GetGenericArguments().Single();
var genericHelperType =
typeof(GenericCollectionLoader <>).MakeGenericType(typeof(TInterface), innerType);
dynamic loader = Activator.CreateInstance(genericHelperType, _context, _config, _isAsync,
principalInstance, navigation.PropertyInfo, levelToLookFor);
var navValueTask = loader.GetFilteredEntities();
if (_isAsync)
{
return(await navValueTask);
}
return(ValueTaskSyncCheckers.CheckSyncValueTaskWorkedDynamicAndReturnResult <IEnumerable>(navValueTask));
}
public async ValueTask WalkEntitiesSoftDelete(object principalInstance, byte cascadeLevel)
{
if (!(principalInstance is TInterface castToCascadeSoftDelete && principalInstance.GetType().IsClass) || _stopCircularLook.Contains(principalInstance))
{
return; //isn't something we need to consider, or we saw it before, so it returns
}
_stopCircularLook.Add(principalInstance); //we keep a reference to this to stop the method going in a circular loop
if (ApplyChangeIfAppropriate(castToCascadeSoftDelete, cascadeLevel))
{
//If the entity shouldn't be changed then we leave this entity and any of it children
return;
}
var principalNavs = _context.Entry(principalInstance)
.Metadata.GetNavigations()
.Where(x => !x.IsOnDependent && //navigational link goes to dependent entity(s)
//The developer has whatDoing a Cascade delete behaviour (two options) on this link
(x.ForeignKey.DeleteBehavior == DeleteBehavior.ClientCascade || x.ForeignKey.DeleteBehavior == DeleteBehavior.Cascade))
.ToList();
foreach (var navigation in principalNavs)
{
if (navigation.PropertyInfo == null)
{
//This could be changed by enhancing the navigation.PropertyInfo.GetValue(principalInstance);
throw new NotImplementedException("Currently only works with navigation links that are properties");
}
//It loads the current navigational value so that we can limit the number of database selects if the data is already loaded
var navValue = navigation.PropertyInfo.GetValue(principalInstance);
if (navigation.IsCollection)
{
if (_readEveryTime || navValue == null)
{
var navValueTask = LoadNavigationCollection(principalInstance, navigation, cascadeLevel);
if (_isAsync)
{
navValue = await navValueTask;
}
else
{
navValue = ValueTaskSyncCheckers.CheckSyncValueTaskWorkedDynamicAndReturnResult <IEnumerable>(navValueTask);
}
}
if (navValue == null)
{
return; //no relationship
}
foreach (var entity in navValue as IEnumerable)
{
var walkValueTask = WalkEntitiesSoftDelete(entity, (byte)(cascadeLevel + 1));
if (_isAsync)
{
await walkValueTask;
}
else
{
walkValueTask.CheckSyncValueTaskWorked();
}
}
}
else
{
if (_readEveryTime || navValue == null)
{
var navValueTask = LoadNavigationSingleton(principalInstance, navigation, cascadeLevel);
if (_isAsync)
{
navValue = await navValueTask;
}
else
{
navValue = navValueTask.CheckSyncValueTaskWorkedAndReturnResult();
}
}
if (navValue == null)
{
return; //no relationship
}
var walkValueTask = WalkEntitiesSoftDelete(navValue, (byte)(cascadeLevel + 1));
if (_isAsync)
{
await walkValueTask;
}
else
{
walkValueTask.CheckSyncValueTaskWorked();
}
}
}
}
