MongoDB Exercise - Find restaurants with grades greater than 5 and located in the borough Manhattan

Write a MongoDB query to find the restaurants that have all grades with a score greater than 5 and are located in the borough of Manhattan.

Structure of 'restaurants' collection :

{
  "address": {
     "building": "1007",
     "coord": [ -73.856077, 40.848447 ],
     "street": "Morris Park Ave",
     "zipcode": "10462"
  },
  "borough": "Bronx",
  "cuisine": "Bakery",
  "grades": [
     { "date": { "$date": 1393804800000 }, "grade": "A", "score": 2 },
     { "date": { "$date": 1378857600000 }, "grade": "A", "score": 6 },
     { "date": { "$date": 1358985600000 }, "grade": "A", "score": 10 },
     { "date": { "$date": 1322006400000 }, "grade": "A", "score": 9 },
     { "date": { "$date": 1299715200000 }, "grade": "B", "score": 14 }
  ],
  "name": "Morris Park Bake Shop",
  "restaurant_id": "30075445"
}

Query:

db.restaurants.find({
  "borough": "Manhattan",
  "grades": {
    "$not": {
      "$elemMatch": {
        "score": {
          "$lte": 5
        }
      }
    }
  }
})

Output:

{ "_id" : ObjectId("6422c02d1238e3bec47ca611"), "address" : { "building" : "522", "coord" : [ -73.95171, 40.767461 ], "street" : "East   74 Street", "zipcode" : "10021" }, "borough" : "Manhattan", "cuisine" : "American ", "grades" : [ { "date" : { "$date" : 1409616000000 }, "grade" : "A", "score" : 12 }, { "date" : { "$date" : 1387411200000 }, "grade" : "B", "score" : 16 }, { "date" : { "$date" : 1369699200000 }, "grade" : "A", "score" : 9 }, { "date" : { "$date" : 1354838400000 }, "grade" : "A", "score" : 13 }, { "date" : { "$date" : 1332979200000 }, "grade" : "A", "score" : 11 } ], "name" : "Glorious Food", "restaurant_id" : "40361521" }
{ "_id" : ObjectId("6422c04d1238e3bec47ca614"), "address" : { "building" : "759", "coord" : [ -73.9925306, 40.7309346 ], "street" : "Broadway", "zipcode" : "10003" }, "borough" : "Manhattan", "cuisine" : "Delicatessen", "grades" : [ { "date" : { "$date" : 1390262400000 }, "grade" : "A", "score" : 12 }, { "date" : { "$date" : 1357257600000 }, "grade" : "A", "score" : 11 }, { "date" : { "$date" : 1339027200000 }, "grade" : "A", "score" : 6 }, { "date" : { "$date" : 1326758400000 }, "grade" : "A", "score" : 8 } ], "name" : "Bully'S Deli", "restaurant_id" : "40361708" }

.....

Explanation:

The said query in MongoDB that returns all documents in the 'restaurants' collection that have at least one grade with a score of greater than 5 and that are located in the borough of Manhattan.

The condition searches for documents where the "grades" field contains at least one sub-document where the "score" field has a value more than 5, and the "borough" field has a value of "Manhattan".

Note: This output is generated using MongoDB server version 3.6

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