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$filter inside $project MongoDB Using Spring Data

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天命终不由人
天命终不由人 2020-12-20 03:40

I have a subdocument that is an array of a parent document. \"devices\"

In that array I\'ve got a property which is a Date property.

I want

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  • 感动是毒
    感动是毒 (楼主)
    2020-12-20 04:07

    I managed to solve my problem with the Spring boot Version 1.4.1.RELEASE and I did this:

    Aggregation aggregation = newAggregation(
            match(Criteria.where("devices.evaluationDate").is(date)),
            project().and(new AggregationExpression() {
                @Override
                public DBObject toDbObject(AggregationOperationContext aggregationOperationContext) {
                    DBObject filterExpression = new BasicDBObject();
                    filterExpression.put("input", "$devices");
                    filterExpression.put("as", "device");
                    filterExpression.put("cond", new BasicDBObject("$eq", Arrays. asList("$$device.evaluationDate", date)));
                    return new BasicDBObject("$filter", filterExpression);
                }
            }).as("devices")
    );

    AggregationResults list = mongoOperations.aggregate(aggregation,
            MyClass.class, MyClass.class);



    I elaborated based on this: Does Spring Data MongoDb support $filter array aggregations operator?
    


    My project was on Spring boot 1.4.0.RELEASE but that version didnt have the AggregationExpression interface PUBLIC, so i just updated to 1.4.1.RELEASE and i did work.
    
    
    
             
    
                                                        
    
            
            
    
              
                
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