DATAMONGO-1902 - Add support for embedding objects. #896
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In case we don't feel comfortable merging the related PR in Spring Data Commons (spring-projects/spring-data-commons#480), let's move forward by introducing a store-specific embedded-annotation and sort out the duplications in |
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We now support embedded types in the sense of unwrapping nested objects into their parent Document to flatten out domain models where needed.
A domain class of:
public class User {
@id
private String userId;
@Embedded(onEmpty = USE_NULL)
private UserName name;
}
public class UserName {
private String firstname;
private String lastname;
}
renders:
{
"_id" : "1da2ba06-3ba7",
"firstname" : "Emma",
"lastname" : "Frost"
}
Reorder API methods, remove unused MongoPersistentProperty.isNullable method, reduce visibility where possible. Add Javadoc and tweak documentation wording. Introduce DotPath utility to abstract dot path concatenation.
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Feb 16, 2021
We now support embedded types in the sense of unwrapping nested objects into their parent Document to flatten out domain models where needed.
A domain class of:
public class User {
@id
private String userId;
@Embedded(onEmpty = USE_NULL)
private UserName name;
}
public class UserName {
private String firstname;
private String lastname;
}
renders:
{
"_id" : "1da2ba06-3ba7",
"firstname" : "Emma",
"lastname" : "Frost"
}
Resolves #2803.
Original pull request: #896.
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That's merged and polished now. |
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Depends on: spring-projects/spring-data-commons#2293
Embedded Types
Embedded entities are used to design value objects in your Java domain model whose properties are flattened out into the MongoDB Document.
Embedded Types Mapping
In the example below you see, that
User.nameis annotated with@Embedded.The consequence of this is that all properties of
UserNameare folded into theuserdocument.{ "_id" : "1da2ba06-3ba7", "firstname" : "Emma", "lastname" : "Frost" }It is possible to use complex types within an embedded object.
However those must not be, nor contain embedded fields themselves.