public static ValueTask <int> RelationalUpdateAsync <T>(this DbContext context, T entity) where T : class
{
var configuration = new RelationalUpdateConfiguration
{
UpdatedTypes = context.Entry(entity).GetCollectionTypes().ToList()
};
return(RelationalUpdateAsync(context, entity, configuration));
}
public static async ValueTask <int> RelationalUpdateAsync <T>(this DbContext context, T entity, RelationalUpdateConfiguration configuration) where T : class
{
var entry = context.Entry(entity);
var primaryKey = entry.GetPrimaryKeyValue();
var navigation = entry.Metadata.GetNavigations().ToList();
foreach (var collectionType in configuration.UpdatedTypes)
{
var propertyName = navigation.Where(p => p.ClrType.GetGenericArguments()[0] == collectionType.Type).Select(p => p.Name).FirstOrDefault();
if (string.IsNullOrEmpty(propertyName))
{
continue;
}
var collection = entry.Collection(propertyName);
var foreignKey = collection.Metadata.ForeignKey;
var primaryKeyName = collection.EntityEntry.GetPrimaryKeyName();
var dynamicList = await collection.CurrentValue.ToDynamicListAsync();
var primaryKeyList = dynamicList
.Select(p => p.GetType().GetProperty(primaryKeyName)?.GetValue(p, null))
.Where(p => p != GetDefaultValue(p.GetType()))
.ToList();
var fkName = foreignKey.Properties.FirstOrDefault()?.Name;
if (!collectionType.RemoveOnDatabase)
{
continue;
}
var databaseValues = await collection.Query().Where($"{fkName} == @0", primaryKey).ToDynamicListAsync();
foreach (dynamic o in databaseValues)
{
var id = o.GetType().GetProperty(primaryKeyName)?.GetValue(o, null);
if (primaryKeyList.Contains(id))
{
context.Entry(o).State = EntityState.Detached;
}
else
{
context.Remove(o);
}
}
}
if (configuration.TriggerSaveChanges)
{
return(await context.SaveChangesAsync());
}
return(0);
}