verketten Arrays innerhalb Arrays verschachtelt in einem anderen Array verschachtelt

Question

Ohne auf, wie genau habe ich hier, kann mir jemand helfen, den Inhalt dieser verschachtelten Arrays Aggregation in Mongo verketten:

verketten

{ "missing_users" : [ 
      [ 
       [ 
        "attachment_5089820813-30177-ulr2vz.csv", 
        "User not found for 201610-EEC-100-A01-31562" 
       ], 
       [ 
        "attachment_50820160813-30177-ulr2vz.csv", 
        "User not found for 201610-EEC-001-001-31567" 
       ], 
       [ 
        "attachment_5089820813-30177-ulr2vz.csv", 
        "User not found for 201610-EEC-001-001-31547)" 
       ],   
      ], 
      [ 
       [ 
        "attachment_508160813-28337-5qpqyb.csv", 
        "User not found for 201610-ETX-010-001-33550)" 
       ], 
       [ 
        "attachment_50520160813-28337-5qpqyb.csv", 
        "User not found for 201610-ETX-010-001-33330)" 
       ], 
       [ 
        "attachment_50895813-28337-5qpqyb.csv", 
        "User not found for 201610-ETX-010-001-33580)" 
       ], 
       [ 
        "attachment_50813-28337-5qpqyb.csv", 
        "User not found for 201610-ETX-010-001-33450)" 
       ], 
       [ 
        "attachment_508916813-28337-5qpqyb.csv", 
        "User not found for 201610-ETX-010-001-33550)" 
       ] 
      ] 
     ] 
} 

I wäre glücklich mit nur einem Array der Strings innerhalb der tief verschachtelten Arrays, aber ich bin auch nur am zweiten Wert der am tiefsten verschachtelten Arrays interessiert.

Dies wäre angemessen:

results : ["attachment_5089820813-30177-ulr2vz.csv", 
     "User not found for 201610-EEC-100-A01-31562", 
     "attachment_5089820813-30177-ulr2vz.csv", 
     "User not found for 201610-EEC-100-A01-31562", 
     "attachment_5089820813-30177-ulr2vz.csv", 
     "User not found for 201610-EEC-100-A01-31562"] 

Aber ich will wirklich nur das:

results : ["User not found for 201610-EEC-100-A01-31762", 
      "User not found for 201610-EEC-100-A01-31862", 
      "User not found for 201610-EEC-100-A01-35602"] 

Answer 1

ich dies versuchen .. tut das unten stehende Hilfe?

s1:PRIMARY> db.ary.aggregate([{"$unwind":"$missing_users"},{"$unwind":"$missing_users"},{"$unwind":"$missing_users"},{"$group":{"_id":"$_id","missing_users":{"$push":"$missing_users"}}}]).pretty(); 

\ output

{ 
     "_id" : ObjectId("57aead0a4d7aa623b01b5820"), 
     "missing_users" : [ 
       "attachment_5089820813-30177-ulr2vz.csv", 
       "User not found for 201610-EEC-100-A01-31562", 
       "attachment_50820160813-30177-ulr2vz.csv", 
       "User not found for 201610-EEC-001-001-31567", 
       "attachment_5089820813-30177-ulr2vz.csv", 
       "User not found for 201610-EEC-001-001-31547)", 
       "attachment_508160813-28337-5qpqyb.csv", 
       "User not found for 201610-ETX-010-001-33550)", 
       "attachment_50520160813-28337-5qpqyb.csv", 
       "User not found for 201610-ETX-010-001-33330)", 
       "attachment_50895813-28337-5qpqyb.csv", 
       "User not found for 201610-ETX-010-001-33580)", 
       "attachment_50813-28337-5qpqyb.csv", 
       "User not found for 201610-ETX-010-001-33450)", 
       "attachment_508916813-28337-5qpqyb.csv", 
       "User not found for 201610-ETX-010-001-33550)" 
     ] 
} 
s1:PRIMARY>