[英]detached entity passed to persist when using RequestFactory
I'm trying to use the RequestFactory but I have trouble changing existing records. 我正在尝试使用RequestFactory,但是我无法更改现有记录。 I keep getting a org.hibernate.PersistentObjectException: detached entity passed to persist while I do not understand what's wrong. 我不断收到org.hibernate.PersistentObjectException:独立的实体传递给持久化,而我不明白这是怎么回事。
I have a the following class: 我有以下课程:
@Service(Product.class)
public interface ProductRequest extends RequestContext {
Request<Long> countProducts();
Request<ProductProxy> findProduct(Long id);
Request<List<ProductProxy>> findAllProducts();
InstanceRequest<ProductProxy, Void> persist();
InstanceRequest<ProductProxy, Void> remove();
}
I have a function that lists all products (retrieved via findAllProducts()) and then I want to change one product. 我有一个列出所有产品的功能(通过findAllProducts()检索),然后我想更改一个产品。 For this purpose I use the following code: 为此,我使用以下代码:
public void changeProductDetails(ProductProxy prod) {
ProductRequest newProductRequest = MyApplication.getRequestFactory().productRequest();
ProductProxy editedProduct = newProductRequest.edit(prod);
editedProduct.setPurpose("new purpose string");
newProductRequest.persist().using(editedProduct).fire(new Receiver<Void>() {
@Override
public void onSuccess(Void arg0)
{
System.out.println("Product changed");
}
});
}
What is wrong, is that persist should not be called to detached objects. 错误的是,不应对分离的对象调用持久性。 Purpose of persist -method is to persist new objects. 持久化方法的目的是持久化新对象。
What you want to do is to merge changes from the detached object. 您想要做的是合并来自分离对象的更改。 That is done via method named merge in Hibernate/JPA. 这是通过Hibernate / JPA中名为merge的方法完成的。
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