MongoDB Exercise - Find the restaurant Id, name, and grades for those restaurants which achieved a specific grade, score on a specific date

Write a MongoDB query to find the restaurant Id, name, and grades for those restaurants which achieved a grade of "A" and scored 11 on an ISODate "2014-08-11T00:00:00Z" among many of survey dates.

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(
    {
        grades: {
            $elemMatch: {
                date: ISODate("2014-08-11T00:00:00Z"),
                grade: "A",
                score: 11
            }
        }
    },
    {
        restaurant_id: 1,
        name: 1,
        grades: 1
    }
).pretty();

Output:

[
  {
    _id: ObjectId('677902d0a15eae4037064bb9'),
    grades: [
      {
        date: ISODate('2014-08-11T00:00:00.000Z'),
        grade: 'A',
        score: 11
      },
      {
        date: ISODate('2013-12-10T00:00:00.000Z'),
        grade: 'A',
        score: 9
      },
      {
        date: ISODate('2013-06-10T00:00:00.000Z'),
        grade: 'A',
        score: 12
      },
      {
        date: ISODate('2012-06-08T00:00:00.000Z'),
        grade: 'A',
        score: 13
      },
      {
        date: ISODate('2012-01-25T00:00:00.000Z'),
        grade: 'A',
        score: 8
      },
      {
        date: ISODate('2011-09-13T00:00:00.000Z'),
        grade: 'A',
        score: 12
      }
    ],
    name: 'Don Filippo Restaurant',
    restaurant_id: '40372417'
  }
]

Explanation:

The said query in MongoDB that searches for restaurants that received an "A" grade with a score of 11 on August 11th, 2014. The result documents will only include the "restaurant_id", "name", and "grades" fields.
The search criteria will match documents where the "grades" field contains an array of subdocuments, where at least one subdocument has a "date" field that matches the ISODate "2014-08-11T00:00:00Z".
The same subdocument also has a "grade" field that equals "A" and also has a "score" field that equals 11.

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