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mongodb lookup nested array

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Exuberant Eel answered on January 7, 2023 Popularity 9/10 Helpfulness 2/10

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answer mongodb lookup nested array

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db.collection.aggregate([
  { "$lookup": {
    "from": Albums.collection.name,
    "let": { "albums": "$albums" },
    "pipeline": [
       { "$match": { "$expr": { "$in": [ "$_id", "$$albums" ] } } },
       { "$lookup": {
         "from": Songs.collection.name,
         "let": { "songs": "$songs" },
         "pipeline": [
           { "$match": { "$expr": { "$in": [ "$_id", "$$songs" ] } } }
         ],
         "as": "songs"
       }}
     ],
     "as": "albums"
  }}
 ])

Popularity 9/10 Helpfulness 2/10 Language whatever

Source: stackoverflow.com

Tags: mongodb-lookup nested whatever

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Exuberant Eel

Contributed on Jan 07 2023

Exuberant Eel

0 Answers Avg Quality 2/10

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