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POHow do I compose a date range query in Mongodb's aggregation framework?
 

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  1. POHow do I compose a date range query in Mongodb's aggregation framework?
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    <p>My goal is to perform a match and group based on date range using mongodb 2.2 and latest c# driver.</p> <p>I'm having trouble creating a match query in the aggregation framework that uses datetimes. I dont know if my datatype is incorrect (the poco has a datetime and the object was utc at save) or if the query is incorrect, which is more likely.</p> <pre><code>//Here is the doc format that I'm querying: { "DateTime" : new Date("2/20/2013 17:29:03"), "DateTimeString" : "20130220", "PurchaseAmount" : 1.91, "ProductId" : "51293ac844da932e941fa2c4", "_id" : "20130220/51293ac844da932e941fa2c4" } </code></pre> <p>//and here is the aggregation query i'm attempting</p> <pre><code> var timeStamp = DateTime.UtcNow.AddDays(-20); var startDate = timeStamp.Date; var endDate = timeStamp.AddDays(1).Date; var match = new BsonDocument { { "$match", new BsonDocument { { "ProductId" , "51293ac844da932e941fa2c4"} } } }; var match2 = new BsonDocument { { "$match", new BsonDocument { *** { "$gte" , new BsonDocument{{"DateTime", timeStamp}} } //, *** // { "$lt" , endDate} } } }; var group = new BsonDocument { { "$group", new BsonDocument { { "_id", new BsonDocument { { "ProductId" , "$ProductId"} ,{ "DateTime" , "$DateTime" } } }, { "AvgOrder", new BsonDocument { { "$avg", "$PurchaseAmount" } } } } } }; var pipeline = new[] { match, match2, group }; var aggregateResult = dbSession.GetCollection&lt;RecentOrders&gt;().Aggregate(pipeline); </code></pre> <p>Please see the <em>*</em>. I want to provide specific time ranges and calculate the average orders for that customer over that interval (by minute, hour, or day ranges). I believe that I have it working except for the date range query portion (match2). I think the issue is the tricky combination of new BsonDocuments and the query. Thanks so much if you can help!</p>
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