Forespørgsel MongoDB søgning kun i bestemte timer

Jeg tror, ​​du kan bruge $hour, $day ... til at opdele datoen i aggregering. For eksempel:

mine data:

db.orders.find()
{ "_id" : ObjectId("5760bf21b05d6825e05fa23d"), "item" : "test1", 
          "create_at" : ISODate("2016-04-30T11:00:00Z") }
{ "_id" : ObjectId("5760bf30b05d6825e05fa23e"), "item" : "test2", 
          "create_at" : ISODate("2016-04-30T12:00:00Z") }
{ "_id" : ObjectId("5760bf37b05d6825e05fa23f"), "item" : "test3",  
          "create_at" : ISODate("2016-04-30T13:00:00Z") }

min forespørgsel:

db.orders.aggregate([{$project:{hour:{$hour:"$create_at"}}}, 
                 {$match:{hour:{"$in":[11,12]}}}])
{ "_id" : ObjectId("5760bf21b05d6825e05fa23d"), "hour" : 11 }
{ "_id" : ObjectId("5760bf30b05d6825e05fa23e"), "hour" : 12 }

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