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relations in mongodb one to many

Lakshay Sharma answered on December 27, 2022 Popularity 9/10 Helpfulness 2/10

answer relations in mongodb one to many

related relations in mongodb one to one

relations in mongodb one to many

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// patron document
{
   _id: "joe",
   name: "Joe Bookreader"
}
// address documents
{
   patron_id: "joe", // reference to patron document
   street: "123 Fake Street",
   city: "Faketon",
   state: "MA",
   zip: "12345"
}
{
   patron_id: "joe",
   street: "1 Some Other Street",
   city: "Boston",
   state: "MA",
   zip: "12345"
}

If your application frequently retrieves the address data with the name information, then your application needs to issue multiple queries to resolve the references. A more optimal schema would be to embed the address data entities in the patron data, as in the following document:

{
   "_id": "joe",
   "name": "Joe Bookreader",
   "addresses": [
                {
                  "street": "123 Fake Street",
                  "city": "Faketon",
                  "state": "MA",
                  "zip": "12345"
                },
                {
                  "street": "1 Some Other Street",
                  "city": "Boston",
                  "state": "MA",
                  "zip": "12345"
                }
              ]
 }

Popularity 9/10 Helpfulness 2/10 Language whatever

Source: www.mongodb.com

Tags: mongodb one-to-many whatever

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Contributed on Dec 27 2022

Lakshay Sharma

0 Answers Avg Quality 2/10

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relations in mongodb one to one

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-2

Currently, the movie collection contains several fields that the application does not need to show a simple overview of a movie, such as fullplot and rating information. Instead of storing all of the movie data in a single collection, you can split the collection into two collections:

The movie collection contains basic information on a movie. This is the data that the application loads by default:

// movie collection
{
  "_id": 1,
  "title": "The Arrival of a Train",
  "year": 1896,
  "runtime": 1,
  "released": ISODate("1896-01-25"),
  "type": "movie",
  "directors": [ "Auguste Lumière", "Louis Lumière" ],
  "countries": [ "France" ],
  "genres": [ "Documentary", "Short" ],
}

The movie_details collection contains additional, less frequently-accessed data for each movie:

// movie_details collection
{
  "_id": 156,
  "movie_id": 1, // reference to the movie collection
  "poster": "http://ia.media-imdb.com/images/M/MV5BMjEyNDk5MDYzOV5BMl5BanBnXkFtZTgwNjIxMTEwMzE@._V1_SX300.jpg",
  "plot": "A group of people are standing in a straight line along the platform of a railway station, waiting for a train, which is seen coming at some distance. When the train stops at the platform, ...",
  "fullplot": "A group of people are standing in a straight line along the platform of a railway station, waiting for a train, which is seen coming at some distance. When the train stops at the platform, the line dissolves. The doors of the railway-cars open, and people on the platform help passengers to get off.",
  "lastupdated": ISODate("2015-08-15T10:06:53"),
  "imdb": {
    "rating": 7.3,
    "votes": 5043,
    "id": 12
  },
  "tomatoes": {
    "viewer": {
      "rating": 3.7,
      "numReviews": 59
    },
    "lastUpdated": ISODate("2020-01-29T00:02:53")
  }
}

This method improves read performance because it requires the application to read less data to fulfill its most common request. The application can make an additional database call to fetch the less-frequently accessed data if needed.

Popularity 7/10 Helpfulness 1/10 Language whatever

Source: www.mongodb.com

Tags: mongodb one-to-one whatever

Link to this answer
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Contributed on Dec 27 2022

Lakshay Sharma

0 Answers Avg Quality 2/10

relations in mongodb one to many

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