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How To Enrich DTO With Virtual Properties Via Spring Projections

Note: You may also like to read the recipe, "How To Create DTO Via Spring Data Projections"

Description: This is an application sample that fetches only the needed columns from the database via Spring Data Projections (DTO) and enrich the result via virtual properties.

Key points:

  • we fetch from the database only the author name and age
  • in the projection interface, AuthorNameAge, use the @Value and Spring SpEL to point to a backing property from the domain model (in this case, the domain model property age is exposed via the virtual property years)
  • in the projection interface, AuthorNameAge, use the @Value and Spring SpEL to enrich the result with two virtual properties that don't have a match in the domain model (in this case, rank and books)

Output example:

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