private bool TryBuildMap(MethodCallExpression node, out BsonValue result)
{
result = null;
var sourceSerializationExpression = node.Arguments[0] as ISerializationExpression;
if (sourceSerializationExpression != null)
{
var lambda = MongoExpressionVisitor.GetLambda(node.Arguments[1]);
if (lambda.Body is ISerializationExpression)
{
result = BuildValue(lambda.Body);
return(true);
}
var inputValue = BuildValue(node.Arguments[0]);
var asValue = lambda.Parameters[0].Name;
// HACK: need to add a leading $ sign to the replacement because of how we resolve values.
var body = FieldNameReplacer.Replace(lambda.Body, sourceSerializationExpression.SerializationInfo.ElementName, "$" + asValue);
var inValue = BuildValue(body);
result = new BsonDocument("$map", new BsonDocument
{
{ "input", inputValue },
{ "as", asValue },
{ "in", inValue }
});
return(true);
}
return(false);
}
public static Expression Replace(Expression node, string oldName, string newName)
{
var replacer = new FieldNameReplacer(oldName, newName);
return(replacer.Visit(node));
}
public static Expression Replace(Expression node, string oldName, string newName)
{
var replacer = new FieldNameReplacer(oldName, newName);
return replacer.Visit(node);
}
