android - 如何使用 GreenDAO 的双向多对多关系？

Question

阅读文档的关系页面后，我可以使用这样的多对多关系：

@Entity
public class Product {
    @Id private Long id;

    @ToMany
    @JoinEntity(
            entity = JoinProductsWithOrders.class,
            sourceProperty = "productId",
            targetProperty = "orderId"
    )
    private List<Order> ordersWithThisProduct;
}

@Entity
public class JoinProductsWithOrders {
    @Id private Long id;
    private Long productId;
    private Long orderId;
}

@Entity
public class Order {
    @Id private Long id;
}

现在，使用此代码，我可以建立双向关系并从 Order 访问与其关联的产品列表吗？或者我也应该在 Order 类中添加一个产品列表？像这样的东西：

...
@Entity
public class Order {
    @Id private Long id;

    @ToMany //I don't know if this is corect btw.
    private List<Product>  productsForThisOrder;
}

Answer 1

你应该这样做：

@Entity
public class Order {
    @Id private Long id;

    @ToMany
    @JoinEntity(
        entity = JoinProductsWithOrders.class,
        sourceProperty = "orderId",
        targetProperty = "productId"
    )
    private List<Product>  productsForThisOrder;
}