#2540 Add DTO mapping from Entity beans via generated mapper code

docs/LIBRARY.md

@@ -54,7 +54,8 @@ Ebean is an ORM library for Java and Kotlin focused on relational data access, t
 | `exists()` | Efficient existence checks | `new QCustomer().email.equalTo(email).exists();` |
 | `findOne()` | Unique/single-row retrieval | `new QCustomer().id.equalTo(id).findOne();` |
 | `findList()` | List retrieval | `new QCustomer().findList();` |
-| `asDto(...).findList()` | DTO projection reads | `new QOrder().asDto(OrderSummary.class).findList();` |
+| `asDto(...).findList()` | Flat DTO projection reads | `new QOrder().asDto(OrderSummary.class).findList();` |
+| `mapTo(...).findList()` | Nested DTO graph projection reads | `new QCustomer().mapTo(CustomerDto.class).findList();` |
 
 ### Entity mapping and lifecycle annotations
 
@@ -188,6 +189,7 @@ database.save(customer);
 | Model entity beans correctly | [entity-bean-creation.md](guides/entity-bean-creation.md) |
 | Use Lombok safely with entities | [lombok-with-ebean-entity-beans.md](guides/lombok-with-ebean-entity-beans.md) |
 | Write type-safe query bean queries | [writing-ebean-query-beans.md](guides/writing-ebean-query-beans.md) |
+| Map nested entity graphs to DTO graphs | [mapping-entity-graphs-to-dtos.md](guides/mapping-entity-graphs-to-dtos.md) |
 | Persist changes and manage transactions | [persisting-and-transactions-with-ebean.md](guides/persisting-and-transactions-with-ebean.md) |
 | Build test entities quickly | [testing-with-testentitybuilder.md](guides/testing-with-testentitybuilder.md) |
 

docs/guides/AGENTS.md

@@ -14,6 +14,7 @@ Key guides (fetch and follow when performing the relevant task):
 - Migrate to `Database.builder()`: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/migrating-to-database-builder.md
 - Migrate JSON APIs from Jackson core to avaje-json-core: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/migrating-json-jackson-core-to-avaje-json-core.md
 - Write queries with query beans: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/writing-ebean-query-beans.md
+- Mapping entity graphs to DTOs (`mapTo`): https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/mapping-entity-graphs-to-dtos.md
 - Derived / formula properties (`@Formula`, `@Formula2`): https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/derived-formula-properties.md
 - Persisting and transactions: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/persisting-and-transactions-with-ebean.md
 - Query metrics and naming: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/ebean-query-metrics.md

docs/guides/README.md

@@ -47,6 +47,7 @@ existing Maven project. Complete the steps in order.
 | Guide | Description |
 |-------|-------------|
 | [Write Ebean queries with query beans](writing-ebean-query-beans.md) | Step-by-step guidance for AI agents to write type-safe Ebean queries; choose the right terminal method; tune `select()` / `fetch()` / `fetchQuery()`; and project to DTOs when entity beans are not the right output |
+| [Mapping entity graphs to DTOs (`mapTo`)](mapping-entity-graphs-to-dtos.md) | Map a nested entity graph query result to a nested DTO graph via `query.mapTo(Dto.class)`; `@DtoPath`/`@DtoRef` for renamed/flattened/id-only properties; identity-aware de-dup via `DtoMapContext`; computed/aggregate DTO values via `@Entity @View` + `@Formula2`/`@Sum`/`@Aggregation`; comparison with the flat `asDto()` pipeline |
 | [Immutable bean cache for read-only references](immutable-bean-cache.md) | Use `ImmutableBeanCache` and `ImmutableBeanCaches.loading(...)` to resolve assoc-one references in read-only/unmodifiable queries, including secondary `fetchQuery`/`fetchLazy` loads |
 | [Using `RawSql` with Ebean](using-rawsql-with-ebean.md) | Choose between `RawSqlBuilder.parse()`, `unparsed()`, and `withPlaceholders()`; the `${where}`/`${andWhere}`/`${having}`/`${andHaving}` placeholder reference for CTEs, window functions, and subqueries; column mapping; and using `RawSql` with query beans |
 
@@ -153,6 +154,7 @@ Key guides (fetch and follow these when performing the relevant task):
 - Database configuration: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/add-ebean-postgres-database-config.md
 - Migrate to `Database.builder()`: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/migrating-to-database-builder.md
 - Write queries with query beans: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/writing-ebean-query-beans.md
+- Mapping entity graphs to DTOs (`mapTo`): https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/mapping-entity-graphs-to-dtos.md
 - Immutable bean cache for read-only references: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/immutable-bean-cache.md
 - Ebean OpenTelemetry tracing: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/add-ebean-opentelemetry.md
 - Query metrics and naming: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/ebean-query-metrics.md
@@ -182,6 +184,7 @@ Key guides (fetch and follow these when performing the relevant task):
 - Database configuration: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/add-ebean-postgres-database-config.md
 - Migrate to `Database.builder()`: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/migrating-to-database-builder.md
 - Write queries with query beans: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/writing-ebean-query-beans.md
+- Mapping entity graphs to DTOs (`mapTo`): https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/mapping-entity-graphs-to-dtos.md
 - Persisting and transactions: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/persisting-and-transactions-with-ebean.md
 - Test container setup: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/add-ebean-postgres-test-container.md
 - DB migration generation: https://raw.githubusercontent.com/ebean-orm/ebean/HEAD/docs/guides/add-ebean-db-migration-generation.md