Model One-to-One Relationships with Embedded Documents

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

// patron document
{
   _id: "joe",
   name: "Joe Bookreader"
}
// address document
{
   street: "123 Fake Street",
   city: "Faketon",
   state: "MA",
   zip: "12345"
}

{
   _id: "joe",
   name: "Joe Bookreader",
   address: {
              street: "123 Fake Street",
              city: "Faketon",
              state: "MA",
              zip: "12345"
            }
}