/// <inheritdoc />
public virtual async Task RemoveFromToManyRelationshipAsync(TResource primaryResource, ISet <IIdentifiable> secondaryResourceIds,
CancellationToken cancellationToken)
{
_traceWriter.LogMethodStart(new
{
primaryResource,
secondaryResourceIds
});
ArgumentGuard.NotNull(secondaryResourceIds, nameof(secondaryResourceIds));
var relationship = (HasManyAttribute)_targetedFields.Relationships.Single();
await _resourceDefinitionAccessor.OnRemoveFromRelationshipAsync(primaryResource, relationship, secondaryResourceIds, cancellationToken);
if (secondaryResourceIds.Any())
{
object rightValue = relationship.GetValue(primaryResource);
HashSet <IIdentifiable> rightResourceIds = _collectionConverter.ExtractResources(rightValue).ToHashSet(IdentifiableComparer.Instance);
rightResourceIds.ExceptWith(secondaryResourceIds);
AssertIsNotClearingRequiredRelationship(relationship, primaryResource, rightResourceIds);
using var collector = new PlaceholderResourceCollector(_resourceFactory, _dbContext);
await UpdateRelationshipAsync(relationship, primaryResource, rightResourceIds, collector, cancellationToken);
await _resourceDefinitionAccessor.OnWritingAsync(primaryResource, OperationKind.RemoveFromRelationship, cancellationToken);
await SaveChangesAsync(cancellationToken);
await _resourceDefinitionAccessor.OnWriteSucceededAsync(primaryResource, OperationKind.RemoveFromRelationship, cancellationToken);
}
}
