Question

我需要使用spring数据mongo db创建聚合plepleine。我正在使用下面的代码来过滤对象数组。效果很好

Aggregation aggregation = newAggregation(
                match(new Criteria().andOperator(criteriaList.toArray(new Criteria[criteriaList.size()]))),
                project().and(new AggregationExpression() {
                    @Override
                    public Document toDocument(AggregationOperationContext aggregationOperationContext) {
                        Document filterExpression = new Document();
                        filterExpression.put("input", "$dailyVisitorStats");
                        filterExpression.put("as", "dailyVisitorStat");
                        filterExpression.put("cond", new Document("$eq", Arrays.asList("$$dailyVisitorStat.weekNum", weekNum)));
                        return new Document("$filter", filterExpression);
                    }
                }).as("dailyVisitorStats")

但是对于其他用例，我需要添加两个条件。在上面的“ Cond”示例中，我需要添加

之类的条件

{ $and: [
       { $eq: [ "$$dailyVisitorStat.weekNum", 22 ] },
        { $gte: [ "$$dailyVisitorStat.today", ISODate("2019-06-01T00:00:00.000Z" ) ] },
        { $lte: [ "$$dailyVisitorStat.today", ISODate("2019-06-01T23:59:59.000Z" ) ] }
      ] }
  }

原始的MongoDb $ Project阶段如下所示。我试图在春季mongo中写同样的东西

{
  "dailyVisitorStats":{
  $filter: {
     input: "$dailyVisitorStats",
     as: "dailyVisitorStat",
     cond: { $and: [
       { $eq: [ "$$dailyVisitorStat.weekNum", 22 ] },
        { $gte: [ "$$dailyVisitorStat.today", ISODate("2019-06-01T00:00:00.000Z" ) ] },
        { $lte: [ "$$dailyVisitorStat.today", ISODate("2019-06-01T23:59:59.000Z" ) ] }
      ] }
  }
}
}

我该怎么做？

Answer 1

您可以尝试以下代码段吗？我无法在mongo实例上运行它，但是从语法上（希望）在逻辑上是正确的。

Aggregation aggregation = newAggregation(
        match(new Criteria().andOperator(criteriaList.toArray(new Criteria[criteriaList.size()]))),
        project().and(ArrayOperators.Filter.filter("dailyVisitorStats")
                .as("dailyVisitorStat")
                .by(BooleanOperators.And.and(
                        ComparisonOperators.Eq.valueOf("dailyVisitorStat.weekNum").equalTo(weekNum),
                        ComparisonOperators.Gte.valueOf("dailyVisitorStat.today").greaterThanEqualTo(date1),
                        ComparisonOperators.Lte.valueOf("dailyVisitorStat.today").lessThanEqualTo(date2))))
            .as("dailyVisitorStats"));

我使用了DATAMONGO-1491的$filter支持

Spring MongoDB中的聚合管道

1 个答案: