MongoDb Post formatting of $lookup aggregation with limited data -

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i have 2 collection coll1 , coll2. want apply $lookup on fields "_id" , "comm_field" used query:

db.coll1.aggregate([     {       $lookup:         {           from: "coll2",           localfield: "_id",           foreignfield: "comm_field",           as: "inventory_docs"         }    },    {        $project:{"_id" : 0, "inventory_docs" : 1}    },    { $unwind:"$inventory_docs"} ])

and output as:

/* 1 */ {     "inventory_docs" : {         "_id" : objectid("ssdfsfsdfsdfsfsdfsdfsdfsfsdf"),         "comm_field" : numberlong(1111),         "status" : "active"     } }  /* 2 */ {     "inventory_docs" : {         "_id" : objectid("erteterterterterterterterter"),         "comm_field" : numberlong(1111),         "status" : "active"     } }  /* 3 */ {     "inventory_docs" : {         "_id" : objectid("vbvbfvbdbbcvbvcbcdrgvbcbcbcv"),         "comm_field" : numberlong(2222),         "status" : "active"     } }

is there way can see output like:

        {             "_id" : objectid("ssdfsfsdfsdfsfsdfsdfsdfsfsdf"),             "comm_field" : numberlong(1111),             "status" : "active"         }         {             "_id" : objectid("erteterterterterterterterter"),             "comm_field" : numberlong(1111),             "status" : "active"         }         {             "_id" : objectid("vbvbfvbdbbcvbvcbcdrgvbcbcbcv"),             "comm_field" : numberlong(2222),             "status" : "active"         }

so want output in format {---}, not in {"inventory_docs":{---}}

neil's answer worked. addition of { $replaceroot: { newroot: "$inventory_docs" } } did job. neil.

db.coll1.aggregate([     {       $lookup:         {           from: "coll2",           localfield: "_id",           foreignfield: "comm_field",           as: "inventory_docs"         }    },    {        $project:{"_id" : 0, "inventory_docs" : 1}    },    { $unwind:"$inventory_docs"},    { $replaceroot: { newroot: "$inventory_docs" } } ])




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