MongoDB - Rewind an $unwind nested array after $lookup using $groupIf Mongo $lookup is a left outer join, then how come it excludes non-matching documents?Retrieve only the queried element in an object array in MongoDB collectionFind MongoDB records where array field is not emptyWhat's the $unwind operator in MongoDB?How to use nested grouping in MongoDBmongodb aggregation - unwind/group/project query combination$lookup on nested array of Objects$lookup nested array in mongodbUnwinding two nested array mongodb nodejs in group$unwind and $lookup with php mongodb

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MongoDB - Rewind an $unwind nested array after $lookup using $group


If Mongo $lookup is a left outer join, then how come it excludes non-matching documents?Retrieve only the queried element in an object array in MongoDB collectionFind MongoDB records where array field is not emptyWhat's the $unwind operator in MongoDB?How to use nested grouping in MongoDBmongodb aggregation - unwind/group/project query combination$lookup on nested array of Objects$lookup nested array in mongodbUnwinding two nested array mongodb nodejs in group$unwind and $lookup with php mongodb






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10















MongoDB aggregation gets exponentially complicated by the minute!



I am in so far as to $unwind a nested array and then perform a $lookup by the _id of each object from the unwinded nested array. My final attempt is to reverse the unwinding with $group. However, I am unable to reconstruct the original embedded array, with its original property name, along with the rest of the original immediate properties of each document.



Here is my attempt so far:



db.users.aggregate([

$unwind: "$profile",
$unwind:
path: "$profile.universities",
preserveNullAndEmptyArrays: true

,

$lookup:
from: "universities",
localField: "profile.universities._id",
foreignField: "_id",
as: "profile.universities"

,

$group:
_id: "$_id",
emails: "$first": "$emails" ,
profile: "$first": "$profile" ,
universities: "$push": "$profile.universities"


]).pretty()


What I get is something like this:




"_id" : "A_USER_ID",
"emails" : [

"address" : "AN_EMAIL_ADDRESS",
"verified" : false

],
"profile" :
"name" : "NAME",
"company" : "A COMPANY",
"title" : "A TITLE",
"phone" : "123-123-1234",
"disabled" : false,
"universities" : [

"_id" : "ID_1",
"name" : "UNIVERSITY_NAME_1",
"code" : "CODE_1",
"styles" : AN_OBJECT

]
,
"universities" : [
[

"_id" : "ID_1",
"name" : "UNIVERSITY_NAME_1",
"code" : "CODE_1",
"styles" : AN_OBJECT

],
[

"_id" : "ID_2",
"name" : "UNIVERSITY_NAME_2",
"code" : "CODE_2",
"styles" : AN_OBJECT

]
]



There are 2 issues with this result:



  1. The resulting universities is an array of arrays of one object each, since the $lookup returned a single element array for the original $profile.universities nested array. It should be just an array of objects.

  2. The resulting universities should take its original place as nested under profiles. I am aware why the original profile.universities is the way it is, because I am using the $first operator. My intent behind this is to retain all of the original properties of profile, in junction with retaining the original nested universities array.

Ultimately, what I need is something like this:




"_id" : "A_USER_ID",
"emails" : [

"address" : "AN_EMAIL_ADDRESS",
"verified" : false

],
"profile" :
"name" : "NAME",
"company" : "A COMPANY",
"title" : "A TITLE",
"phone" : "123-123-1234",
"disabled" : false,
"universities" : [

"_id" : "ID_1",
"name" : "UNIVERSITY_NAME_1",
"code" : "CODE_1",
"styles" : AN_OBJECT
,

"_id" : "ID_2",
"name" : "UNIVERSITY_NAME_2",
"code" : "CODE_2",
"styles" : AN_OBJECT

]




Is there another operator that I can use instead of $group to achieve this? Or am I understanding the purpose of $group incorrectly?



Edit: This is the original post, for context:
If Mongo $lookup is a left outer join, then how come it excludes non-matching documents?










share|improve this question
































    10















    MongoDB aggregation gets exponentially complicated by the minute!



    I am in so far as to $unwind a nested array and then perform a $lookup by the _id of each object from the unwinded nested array. My final attempt is to reverse the unwinding with $group. However, I am unable to reconstruct the original embedded array, with its original property name, along with the rest of the original immediate properties of each document.



    Here is my attempt so far:



    db.users.aggregate([

    $unwind: "$profile",
    $unwind:
    path: "$profile.universities",
    preserveNullAndEmptyArrays: true

    ,

    $lookup:
    from: "universities",
    localField: "profile.universities._id",
    foreignField: "_id",
    as: "profile.universities"

    ,

    $group:
    _id: "$_id",
    emails: "$first": "$emails" ,
    profile: "$first": "$profile" ,
    universities: "$push": "$profile.universities"


    ]).pretty()


    What I get is something like this:




    "_id" : "A_USER_ID",
    "emails" : [

    "address" : "AN_EMAIL_ADDRESS",
    "verified" : false

    ],
    "profile" :
    "name" : "NAME",
    "company" : "A COMPANY",
    "title" : "A TITLE",
    "phone" : "123-123-1234",
    "disabled" : false,
    "universities" : [

    "_id" : "ID_1",
    "name" : "UNIVERSITY_NAME_1",
    "code" : "CODE_1",
    "styles" : AN_OBJECT

    ]
    ,
    "universities" : [
    [

    "_id" : "ID_1",
    "name" : "UNIVERSITY_NAME_1",
    "code" : "CODE_1",
    "styles" : AN_OBJECT

    ],
    [

    "_id" : "ID_2",
    "name" : "UNIVERSITY_NAME_2",
    "code" : "CODE_2",
    "styles" : AN_OBJECT

    ]
    ]



    There are 2 issues with this result:



    1. The resulting universities is an array of arrays of one object each, since the $lookup returned a single element array for the original $profile.universities nested array. It should be just an array of objects.

    2. The resulting universities should take its original place as nested under profiles. I am aware why the original profile.universities is the way it is, because I am using the $first operator. My intent behind this is to retain all of the original properties of profile, in junction with retaining the original nested universities array.

    Ultimately, what I need is something like this:




    "_id" : "A_USER_ID",
    "emails" : [

    "address" : "AN_EMAIL_ADDRESS",
    "verified" : false

    ],
    "profile" :
    "name" : "NAME",
    "company" : "A COMPANY",
    "title" : "A TITLE",
    "phone" : "123-123-1234",
    "disabled" : false,
    "universities" : [

    "_id" : "ID_1",
    "name" : "UNIVERSITY_NAME_1",
    "code" : "CODE_1",
    "styles" : AN_OBJECT
    ,

    "_id" : "ID_2",
    "name" : "UNIVERSITY_NAME_2",
    "code" : "CODE_2",
    "styles" : AN_OBJECT

    ]




    Is there another operator that I can use instead of $group to achieve this? Or am I understanding the purpose of $group incorrectly?



    Edit: This is the original post, for context:
    If Mongo $lookup is a left outer join, then how come it excludes non-matching documents?










    share|improve this question




























      10












      10








      10


      3






      MongoDB aggregation gets exponentially complicated by the minute!



      I am in so far as to $unwind a nested array and then perform a $lookup by the _id of each object from the unwinded nested array. My final attempt is to reverse the unwinding with $group. However, I am unable to reconstruct the original embedded array, with its original property name, along with the rest of the original immediate properties of each document.



      Here is my attempt so far:



      db.users.aggregate([

      $unwind: "$profile",
      $unwind:
      path: "$profile.universities",
      preserveNullAndEmptyArrays: true

      ,

      $lookup:
      from: "universities",
      localField: "profile.universities._id",
      foreignField: "_id",
      as: "profile.universities"

      ,

      $group:
      _id: "$_id",
      emails: "$first": "$emails" ,
      profile: "$first": "$profile" ,
      universities: "$push": "$profile.universities"


      ]).pretty()


      What I get is something like this:




      "_id" : "A_USER_ID",
      "emails" : [

      "address" : "AN_EMAIL_ADDRESS",
      "verified" : false

      ],
      "profile" :
      "name" : "NAME",
      "company" : "A COMPANY",
      "title" : "A TITLE",
      "phone" : "123-123-1234",
      "disabled" : false,
      "universities" : [

      "_id" : "ID_1",
      "name" : "UNIVERSITY_NAME_1",
      "code" : "CODE_1",
      "styles" : AN_OBJECT

      ]
      ,
      "universities" : [
      [

      "_id" : "ID_1",
      "name" : "UNIVERSITY_NAME_1",
      "code" : "CODE_1",
      "styles" : AN_OBJECT

      ],
      [

      "_id" : "ID_2",
      "name" : "UNIVERSITY_NAME_2",
      "code" : "CODE_2",
      "styles" : AN_OBJECT

      ]
      ]



      There are 2 issues with this result:



      1. The resulting universities is an array of arrays of one object each, since the $lookup returned a single element array for the original $profile.universities nested array. It should be just an array of objects.

      2. The resulting universities should take its original place as nested under profiles. I am aware why the original profile.universities is the way it is, because I am using the $first operator. My intent behind this is to retain all of the original properties of profile, in junction with retaining the original nested universities array.

      Ultimately, what I need is something like this:




      "_id" : "A_USER_ID",
      "emails" : [

      "address" : "AN_EMAIL_ADDRESS",
      "verified" : false

      ],
      "profile" :
      "name" : "NAME",
      "company" : "A COMPANY",
      "title" : "A TITLE",
      "phone" : "123-123-1234",
      "disabled" : false,
      "universities" : [

      "_id" : "ID_1",
      "name" : "UNIVERSITY_NAME_1",
      "code" : "CODE_1",
      "styles" : AN_OBJECT
      ,

      "_id" : "ID_2",
      "name" : "UNIVERSITY_NAME_2",
      "code" : "CODE_2",
      "styles" : AN_OBJECT

      ]




      Is there another operator that I can use instead of $group to achieve this? Or am I understanding the purpose of $group incorrectly?



      Edit: This is the original post, for context:
      If Mongo $lookup is a left outer join, then how come it excludes non-matching documents?










      share|improve this question
















      MongoDB aggregation gets exponentially complicated by the minute!



      I am in so far as to $unwind a nested array and then perform a $lookup by the _id of each object from the unwinded nested array. My final attempt is to reverse the unwinding with $group. However, I am unable to reconstruct the original embedded array, with its original property name, along with the rest of the original immediate properties of each document.



      Here is my attempt so far:



      db.users.aggregate([

      $unwind: "$profile",
      $unwind:
      path: "$profile.universities",
      preserveNullAndEmptyArrays: true

      ,

      $lookup:
      from: "universities",
      localField: "profile.universities._id",
      foreignField: "_id",
      as: "profile.universities"

      ,

      $group:
      _id: "$_id",
      emails: "$first": "$emails" ,
      profile: "$first": "$profile" ,
      universities: "$push": "$profile.universities"


      ]).pretty()


      What I get is something like this:




      "_id" : "A_USER_ID",
      "emails" : [

      "address" : "AN_EMAIL_ADDRESS",
      "verified" : false

      ],
      "profile" :
      "name" : "NAME",
      "company" : "A COMPANY",
      "title" : "A TITLE",
      "phone" : "123-123-1234",
      "disabled" : false,
      "universities" : [

      "_id" : "ID_1",
      "name" : "UNIVERSITY_NAME_1",
      "code" : "CODE_1",
      "styles" : AN_OBJECT

      ]
      ,
      "universities" : [
      [

      "_id" : "ID_1",
      "name" : "UNIVERSITY_NAME_1",
      "code" : "CODE_1",
      "styles" : AN_OBJECT

      ],
      [

      "_id" : "ID_2",
      "name" : "UNIVERSITY_NAME_2",
      "code" : "CODE_2",
      "styles" : AN_OBJECT

      ]
      ]



      There are 2 issues with this result:



      1. The resulting universities is an array of arrays of one object each, since the $lookup returned a single element array for the original $profile.universities nested array. It should be just an array of objects.

      2. The resulting universities should take its original place as nested under profiles. I am aware why the original profile.universities is the way it is, because I am using the $first operator. My intent behind this is to retain all of the original properties of profile, in junction with retaining the original nested universities array.

      Ultimately, what I need is something like this:




      "_id" : "A_USER_ID",
      "emails" : [

      "address" : "AN_EMAIL_ADDRESS",
      "verified" : false

      ],
      "profile" :
      "name" : "NAME",
      "company" : "A COMPANY",
      "title" : "A TITLE",
      "phone" : "123-123-1234",
      "disabled" : false,
      "universities" : [

      "_id" : "ID_1",
      "name" : "UNIVERSITY_NAME_1",
      "code" : "CODE_1",
      "styles" : AN_OBJECT
      ,

      "_id" : "ID_2",
      "name" : "UNIVERSITY_NAME_2",
      "code" : "CODE_2",
      "styles" : AN_OBJECT

      ]




      Is there another operator that I can use instead of $group to achieve this? Or am I understanding the purpose of $group incorrectly?



      Edit: This is the original post, for context:
      If Mongo $lookup is a left outer join, then how come it excludes non-matching documents?







      mongodb join mongodb-query aggregation-framework mongodb-aggregation






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited May 23 '17 at 12:24









      Community

      11 silver badge




      11 silver badge










      asked Sep 14 '16 at 13:14









      Sun LeeSun Lee

      2241 gold badge3 silver badges15 bronze badges




      2241 gold badge3 silver badges15 bronze badges

























          1 Answer
          1






          active

          oldest

          votes


















          19
















          Because the $lookup operator produces an array field, you need to $unwind the new field before the $group pipeline to get the desired result:



          db.users.aggregate([
          "$unwind": "$profile" ,
          "$unwind":
          "path": "$profile.universities",
          "preserveNullAndEmptyArrays": true
          ,
          "$lookup":
          "from": "universities",
          "localField": "profile.universities._id",
          "foreignField": "_id",
          "as": "universities"
          ,
          "$unwind": "$universities" ,
          "$group":
          "_id": "$_id",
          "emails": "$first": "$emails" ,
          "profile": "$first": "$profile" ,
          "universities": "$push": "$universities"
          ,
          "$project":
          "emails": 1,
          "profile.name" : 1,
          "profile.company": 1,
          "profile.title" : 1,
          "profile.phone" : 1,
          "profile.disabled": 1,
          "profile.universities": "$universities"

          ]).pretty()





          share|improve this answer






















          • 3





            Thanks @chridam, the second $unwind and $project did the trick! I had to modify two parts: 1. change the second unwind to "$unwind": "path": "$profile.universities", "preserveNullAndEmptyArrays": true, and 2. change the $group "universities" to "universities": "$push": "$profile.universities" and I was able to get my results.

            – Sun Lee
            Sep 14 '16 at 16:53










          Your Answer






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          1 Answer
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          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          19
















          Because the $lookup operator produces an array field, you need to $unwind the new field before the $group pipeline to get the desired result:



          db.users.aggregate([
          "$unwind": "$profile" ,
          "$unwind":
          "path": "$profile.universities",
          "preserveNullAndEmptyArrays": true
          ,
          "$lookup":
          "from": "universities",
          "localField": "profile.universities._id",
          "foreignField": "_id",
          "as": "universities"
          ,
          "$unwind": "$universities" ,
          "$group":
          "_id": "$_id",
          "emails": "$first": "$emails" ,
          "profile": "$first": "$profile" ,
          "universities": "$push": "$universities"
          ,
          "$project":
          "emails": 1,
          "profile.name" : 1,
          "profile.company": 1,
          "profile.title" : 1,
          "profile.phone" : 1,
          "profile.disabled": 1,
          "profile.universities": "$universities"

          ]).pretty()





          share|improve this answer






















          • 3





            Thanks @chridam, the second $unwind and $project did the trick! I had to modify two parts: 1. change the second unwind to "$unwind": "path": "$profile.universities", "preserveNullAndEmptyArrays": true, and 2. change the $group "universities" to "universities": "$push": "$profile.universities" and I was able to get my results.

            – Sun Lee
            Sep 14 '16 at 16:53















          19
















          Because the $lookup operator produces an array field, you need to $unwind the new field before the $group pipeline to get the desired result:



          db.users.aggregate([
          "$unwind": "$profile" ,
          "$unwind":
          "path": "$profile.universities",
          "preserveNullAndEmptyArrays": true
          ,
          "$lookup":
          "from": "universities",
          "localField": "profile.universities._id",
          "foreignField": "_id",
          "as": "universities"
          ,
          "$unwind": "$universities" ,
          "$group":
          "_id": "$_id",
          "emails": "$first": "$emails" ,
          "profile": "$first": "$profile" ,
          "universities": "$push": "$universities"
          ,
          "$project":
          "emails": 1,
          "profile.name" : 1,
          "profile.company": 1,
          "profile.title" : 1,
          "profile.phone" : 1,
          "profile.disabled": 1,
          "profile.universities": "$universities"

          ]).pretty()





          share|improve this answer






















          • 3





            Thanks @chridam, the second $unwind and $project did the trick! I had to modify two parts: 1. change the second unwind to "$unwind": "path": "$profile.universities", "preserveNullAndEmptyArrays": true, and 2. change the $group "universities" to "universities": "$push": "$profile.universities" and I was able to get my results.

            – Sun Lee
            Sep 14 '16 at 16:53













          19














          19










          19









          Because the $lookup operator produces an array field, you need to $unwind the new field before the $group pipeline to get the desired result:



          db.users.aggregate([
          "$unwind": "$profile" ,
          "$unwind":
          "path": "$profile.universities",
          "preserveNullAndEmptyArrays": true
          ,
          "$lookup":
          "from": "universities",
          "localField": "profile.universities._id",
          "foreignField": "_id",
          "as": "universities"
          ,
          "$unwind": "$universities" ,
          "$group":
          "_id": "$_id",
          "emails": "$first": "$emails" ,
          "profile": "$first": "$profile" ,
          "universities": "$push": "$universities"
          ,
          "$project":
          "emails": 1,
          "profile.name" : 1,
          "profile.company": 1,
          "profile.title" : 1,
          "profile.phone" : 1,
          "profile.disabled": 1,
          "profile.universities": "$universities"

          ]).pretty()





          share|improve this answer















          Because the $lookup operator produces an array field, you need to $unwind the new field before the $group pipeline to get the desired result:



          db.users.aggregate([
          "$unwind": "$profile" ,
          "$unwind":
          "path": "$profile.universities",
          "preserveNullAndEmptyArrays": true
          ,
          "$lookup":
          "from": "universities",
          "localField": "profile.universities._id",
          "foreignField": "_id",
          "as": "universities"
          ,
          "$unwind": "$universities" ,
          "$group":
          "_id": "$_id",
          "emails": "$first": "$emails" ,
          "profile": "$first": "$profile" ,
          "universities": "$push": "$universities"
          ,
          "$project":
          "emails": 1,
          "profile.name" : 1,
          "profile.company": 1,
          "profile.title" : 1,
          "profile.phone" : 1,
          "profile.disabled": 1,
          "profile.universities": "$universities"

          ]).pretty()






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Aug 7 at 15:21

























          answered Sep 14 '16 at 13:56









          chridamchridam

          73.1k16 gold badges122 silver badges160 bronze badges




          73.1k16 gold badges122 silver badges160 bronze badges










          • 3





            Thanks @chridam, the second $unwind and $project did the trick! I had to modify two parts: 1. change the second unwind to "$unwind": "path": "$profile.universities", "preserveNullAndEmptyArrays": true, and 2. change the $group "universities" to "universities": "$push": "$profile.universities" and I was able to get my results.

            – Sun Lee
            Sep 14 '16 at 16:53












          • 3





            Thanks @chridam, the second $unwind and $project did the trick! I had to modify two parts: 1. change the second unwind to "$unwind": "path": "$profile.universities", "preserveNullAndEmptyArrays": true, and 2. change the $group "universities" to "universities": "$push": "$profile.universities" and I was able to get my results.

            – Sun Lee
            Sep 14 '16 at 16:53







          3




          3





          Thanks @chridam, the second $unwind and $project did the trick! I had to modify two parts: 1. change the second unwind to "$unwind": "path": "$profile.universities", "preserveNullAndEmptyArrays": true, and 2. change the $group "universities" to "universities": "$push": "$profile.universities" and I was able to get my results.

          – Sun Lee
          Sep 14 '16 at 16:53





          Thanks @chridam, the second $unwind and $project did the trick! I had to modify two parts: 1. change the second unwind to "$unwind": "path": "$profile.universities", "preserveNullAndEmptyArrays": true, and 2. change the $group "universities" to "universities": "$push": "$profile.universities" and I was able to get my results.

          – Sun Lee
          Sep 14 '16 at 16:53








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