在POST / PUT期间，所有对象的单个自定义反序列化器作为其ID或嵌入的整个对象 [英] single custom deserializer for all objects as their ids or embedded whole objects during POST/PUT

问题描述

  @Entity 
公共产品{
 @Id 
 public int id; 
 
 public String name; 
 
 @ManyToOne（cascade = {CascadeType.DETACH}）
类别类别
 
 @ManyToMany（fetch = FetchType.EAGER，cascade = {CascadeType.DETACH}） 
设置<类别> secondaryCategories; 
 
 
} 
  

此实体：

  @Entity 
 public Category {
 @Id 
 public int id; 
 
 public String name; 
} 
  

我希望能够用json发送POST

来自客户端的{name：name，类别：2，secondaryCategories：[3,4,5]} / p>

并且能够反序列化如下：

  {name：名称，类别：{id：2}，secondaryCategories：[{id：3}，{id：4}，{id：5}]} 
  

以防发送时间为

  {name：name，category ：{id：2}，secondaryCategories：[{id：3}，{id：4}，{id：5}]} 
  

我希望它仍能像现在一样工作

我需要什么样的注释和自定义反序列化器？希望反序列化器可以用于所有可能具有id作为属性的对象

谢谢！

编辑

• 查看首选zafrost的 @JsonCreator 答案（ https://stackoverflow.com/a/46618366/986160 ）


• 查看我的完整信息回答（ https://stackoverflow.com/a/46618193/986160 ）以扩展 StdDeserializer 并使用默认反序列化通过 ObjectMapper

解决方案

另一种方法是使用 @JsonCreator 工厂方法，如果你可以修改你的实体

 私有类产品{
 @JsonProperty（category）
私有类别类别; 
 
 @JsonProperty（secondaryCategories）
 private List< Category> secondaryCategories; 
} 
 
 
私有类别类别$ 
 @JsonProperty（id）
 private int id; 
 
 @JsonCreator 
 public static Category factory（int id）{
 Category p = new Category（）; 
 p.id = id; 
 //或某个db调用
返回p; 
} 
} 
  

甚至这样的东西也应该起作用

 私有类别类别{
 private int id; 
 
 public Category（）{} 
 
 @JsonCreator 
 public Category（int id）{
 this.id = id; 
} 
} 
  

@Entity
public Product {
   @Id
   public int id;

   public String name;

   @ManyToOne(cascade = {CascadeType.DETACH} )
   Category category

   @ManyToMany(fetch = FetchType.EAGER, cascade = {CascadeType.DETACH} )
   Set<Category> secondaryCategories;


}

and this entity:

@Entity
public Category {
   @Id
   public int id;

   public String name;
}

I would like to be able to send a POST with json

{ name: "name", category: 2, secondaryCategories: [3,4,5] } from client-side

and be able to be deserialized like:

{ name: "name", category: {id: 2 }, secondaryCategories: [{id: 3}, {id: 4}, {id: 5}] }

in case it was sent as

 { name: "name", category: {id: 2 }, secondaryCategories: [{id: 3}, {id: 4}, {id: 5}] }

I would like it to still work as now

what kind of annotation and custom deserializer I need? Hopefully the deserializer can work for all possible objects that have id as a property

Thanks!

Edit

• See the preferred zafrost's @JsonCreator answer (https://stackoverflow.com/a/46618366/986160)
• See my complete answer (https://stackoverflow.com/a/46618193/986160) for extending StdDeserializer and using default deserialization through ObjectMapper

解决方案

Another approach is to use @JsonCreator factory method if you can modify your Entity

private class Product {
    @JsonProperty("category")
    private Category category;

    @JsonProperty("secondaryCategories")
    private List<Category> secondaryCategories;
}


private class Category {
    @JsonProperty("id")
    private int id;

    @JsonCreator
    public static Category factory(int id){
        Category p = new Category();
        p.id = id;
        // or some db call 
        return p;
    }
}

Or even something like this should also work

private class Category {
    private int id;

    public Category() {}

    @JsonCreator
    public Category(int id) {
        this.id = id;
    }
}

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