arrays - MongoDB aggregate result with two different keys -


i have put question helped me obtain array obtaining result in aggregation mongodb query ( mongodb aggregate array 2 fields )

my problem right obtain combine 2 different keys.

i have products collection general products on it: 

{   "_id" : objectid("554b9f223d77c810e8915539"),   "brand" : "airtex",   "product" : "e7113m",   "type" : "fuel pump",   "warehouse_sku" : [     "1_5551536f3d77c870fc388a04",     "2_55515e163d77c870fc38b00a"    ] }

and have following child product (it has multiple general products on it)

{     "_id" : objectid("55524d0c3d77c8ba9cb2d9fd"),     "brand" : "performance",     "product" : "p41k",     "type" : "fuel pump component",     "general_products" : [         objectid("554b9f123d77c810e891552f"),         objectid("554b9f143d77c810e8915530"),         objectid("554b9f173d77c810e8915533"),         objectid("554b99b83d77c810e8915436"),         objectid("554b9f2e3d77c810e8915549")     ],     "warehouse_sku" : [         "1_555411043d77c8066b3b6720",         "1_555411073d77c8066b3b6728"     ] }

my problem here want general products _id , inside child products matches specific warehouse_sku pattern. desired result this:

{ "_id" : objectid("554b9f2e3d77c810e8915549") } { "_id" : objectid("554b99b83d77c810e8915436") } { "_id" : objectid("554b9f173d77c810e8915533") } { "_id" : objectid("554b9f143d77c810e8915530") } { "_id" : objectid("554b9f123d77c810e891552f") } { "_id" : objectid("554b9f223d77c810e8915539") }

i have made multiple queries like:

1) 

db.products.aggregate([ ... {$match:{warehouse_sku: /^1/ }}, ... {$unwind:"$general_products"}, ... {$group:{_id: "$general_products"}} ... ])

but _id general product not on it: 

{ "_id" : objectid("554b9f2e3d77c810e8915549") } { "_id" : objectid("554b99b83d77c810e8915436") } { "_id" : objectid("554b9f173d77c810e8915533") } { "_id" : objectid("554b9f143d77c810e8915530") } { "_id" : objectid("554b9f123d77c810e891552f") }

2)

db.products.aggregate([ ... {$match:{warehouse_sku: /^1/ }}, ... {$group:{_id: "$_id"}} ... ])

but give me _id general , child products [don't want it] not _id's general products inside child product:

{ "_id" : objectid("55524d0c3d77c8ba9cb2d9fd") } { "_id" : objectid("554b9f223d77c810e8915539") }

use following aggregation pipeline desired list of objectids. uses $ifnull aggregation operator add _id field if array general_products field not exist:

db.products.aggregate([     {         "$match": {"warehouse_sku": /^1/ }     },     {         "$group": {             "_id": {                 "_id": "$_id",                 "general_products": "$general_products"             },             "data": {                 "$addtoset": "$_id"             }         }     },     {         "$project": {             "_id": 0,             "general_products": {                 "$ifnull": ["$_id.general_products", "$data"]             }         }     },     {         "$unwind": "$general_products"     },     {         "$group": {             "_id": null,             "list_products": {                 "$addtoset": "$general_products"             }         }     } ]);

this give document array list_products objectids:

/* 1 */ {     "result" : [          {             "_id" : null,             "list_products" : [                  objectid("554b9f223d77c810e8915539"),                  objectid("554b9f2e3d77c810e8915549"),                  objectid("554b99b83d77c810e8915436"),                  objectid("554b9f173d77c810e8915533"),                  objectid("554b9f143d77c810e8915530"),                  objectid("554b9f123d77c810e891552f")             ]         }     ],     "ok" : 1 }

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