使用Spring Data的ProjectionOperation类在MongoDB上创建聚合查询时,使用带有“ $”(例如’test $’)字符的字段会导致IllegalArgumentException
验证spring数据mongodb源时,我注意到在AggregationField类的构造函数中,对字段名称进行了清理. Fields.java Class
private static String cleanUp(String source) {
if (Aggregation.SystemVariable.isReferingToSystemVariable(source)) {
return source;
}
int dollarIndex = source.lastIndexOf('$');
return dollarIndex == -1 ? source : source.substring(dollarIndex + 1);
}
MongoDB中字段的命名法不鼓励使用“ $”字符,否则这是Spring Data问题吗？
最佳答案
MongoDB官方驱动程序当前不支持的reference documentation clearly states：
IMPORTANT
The MongoDB Query Language cannot always meaningfully express queries over documents whose field names contain these characters (see SERVER-30575). Until support is added in the query language,the use of $and . in field names is not recommended and is not supported by the official MongoDB drivers.
{quote}
