protected internal virtual Expression VisitOrderBy(OrderByExpression node)
{
return(node.Update(
Visit(node.Source),
Visit(node.Clauses, VisitOrderByClause)));
}
protected internal virtual Expression VisitOrderBy(OrderByExpression node)
{
return node.Update(
Visit(node.Source),
Visit(node.Clauses, VisitOrderByClause));
}
private void TranslateOrderBy(OrderByExpression node)
{
Translate(node.Source);
BsonDocument sort = new BsonDocument();
foreach (var clause in node.Clauses)
{
var field = FieldExpressionFlattener.FlattenFields(clause.Expression) as IFieldExpression;
if (field == null)
{
throw new NotSupportedException("Only fields are allowed in a $sort.");
}
var direction = clause.Direction == SortDirection.Ascending ? 1 : -1;
if (sort.Contains(field.FieldName))
{
var message = string.Format("Redundant ordering fields are not supported: {0}.", field.FieldName);
throw new NotSupportedException(message);
}
sort.Add(field.FieldName, direction);
}
_stages.Add(new BsonDocument("$sort", sort));
}
private void VisitOrderBy(OrderByExpression node)
{
Visit(node.Source);
BsonDocument sort = new BsonDocument();
foreach (var clause in node.Clauses)
{
var serializationExpression = (SerializationExpression)clause.Expression;
var info = serializationExpression.SerializationInfo;
var name = info.ElementName;
var direction = clause.Direction == SortDirection.Ascending ? 1 : -1;
if (!sort.Contains(name))
{
sort.Add(name, direction);
}
else if (sort[name] != direction)
{
sort.Remove(name);
sort.Add(name, direction);
}
}
_stages.Add(new BsonDocument("$sort", sort));
}
