Question 263249 in Mongodb Question posted in
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Mongodb – how to access the value of key which contains an array of objects in mongo db

I have to access the value of name in Cuisine key , the data in database is stored in this form , the key Cuisine is an array of Objects which has keys cuisine and name i have to filter according to name .how to write a filter Query for this ?

  "_id": "1",
  "name": "Gulab",
  "city_name": "Delhi",
  "city": 1,
  "area": 11,
  "locality": "Pitampura, New Delhi",
  "thumb": "https://b.zmtcdn.com/data/pictures/chains/3/6303/640252389ddc3f264dd0e9f2741e73cd.jpg",
  "cost": 450,
  "address": "Shop 1, Plot D,  Pitampura, New Delhi Complex, Chincholi, Delhi-110006, Delhi",
  "type": [
    {
      "mealtype": 1,
      "name": "breakfast"
    },
    {
      "mealtype": 3,
      "name": "dinner"
    }
  ],
  "Cuisine": [
    {
      "cuisine": 1,
      "name": "North Indain"
    },
    {
      "cuisine": 4,
      "name": "Fast Food"
    }
  ]
}````
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2

Answers


  1. 0

    To filter your MongoDB documents based on the value of a key within an array, you can use the $elemMatch operator.

    db.myCollection.find({
  "Cuisine": {
    $elemMatch: {
      "name": "Fast Food"
    }
  }
})

    This query will return all documents where at least one subdocument in the "Cuisine" array has a "name" field with the value "Fast Food."

    You can adjust the conditions within the $elemMatch operator to filter based on other criteria within the subdocuments.

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  2. 0

    I have a similar confusion as expressed by jQueeny in the comments. Assuming that you want to find documents that have a specific Cuisine.name, the query is very straightforward:

    db.collection.find({
  "Cuisine.name": "Fast Food"
})

    See how it works in this playground example.

    The $elemMatch operator mentioned in the other answer is not needed here since it is a single equality condition. More information about querying arrays of documents can be found here in the documentation and guidance on querying embedded documents in general is here.

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