TJ-Bot
```java
@Data
@NoArgsConstructor
@AllArgsConstructor
public class LessonDTO {
private Long id;
@NotBlank(message="Name must not be blank")
private String name;
@NotBlank(message="Must have an instructor")
private String instructorName
k(message="Description must not be blank")
private String description;
@NotNull(message="Category must not be null")
private CategoryDTO category;
}
@Data
@NoArgsConstructor
@AllArgsConstructor
public class CategoryDTO {
private Long id;
@NotBlank(message="Name must not be blank")
private String name;
}
In the `LessonDTO` class, we have a field `category` of type `CategoryDTO`. When trying to map a `LessonDTO` object to a database entity using a mapping framework like MapStruct or ModelMapper, you may encounter issues with mapping the `category` field. This is because the mapping framework does not know how to map a `CategoryDTO` object to the corresponding database entity.
To resolve this mapping issue, you can create custom mappers or converters in your mapping framework configuration. These mappers will define how to map a `CategoryDTO` object to the appropriate database entity fields. For example, you can create a custom mapper that extracts the necessary information from the `CategoryDTO` object and sets it in the database entity.
By implementing custom mappers or converters for complex objects like `CategoryDTO`, you can ensure that your mapping framework correctly handles all fields and relationships in your DTO classes. This will help prevent any mapping issues and ensure smooth integration between your DTO objects and database entities.
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