Create a data model that uses embedded documents to describe a one-to-one relationship between connected data. Embedding connected data in a single document can reduce the number of read operations required to obtain data. In general, structure your schema so your application receives all of its required information in a single read operation. For example, you can use the the embedded one-to-one model to describe the following relationships:
- Country to capital city
- User account to email address
- Building to address
Example
The example schema contains two entities, a patron and an address:
// patron document
{
_id: "joe",
name: "Joe Bookreader"
}
// address document
{
street: "123 Fake Street",
city: "Faketon",
state: "MA",
zip: "12345"
}Embedded Document Pattern
The address data is frequently retrieved with the patron information. To allow your application to retreive all necessary information with a single query, embed the address information inside of the patron document:
{
_id: "joe",
name: "Joe Bookreader",
address: {
street: "123 Fake Street",
city: "Faketon",
state: "MA",
zip: "12345"
}
}