5.5. 新建实体实例

可以使用 POST 请求地址创建新的 sales$Order 实体实例：

http://localhost:8080/app/rest/v2/entities/sales$Order

必须将 OAuth token 放在带有 Bearer 类型的 Authorization 请求头中。

请求体必须包含一个描述新实体实例的 JSON 对象，例如：

{
  "number": "00017",
  "date": "2016-09-01",
  "description": "Back to school",
  "items": [
    {
      "_entityName": "sales$OrderItem",
      "price": 100,
      "name": "School bag"
    },
    {
      "_entityName": "sales$OrderItem",
      "price": 9.90,
      "name": "Pencils"
    }
  ],
  "customer": {
    "id": "4aa9a9d8-01df-c8df-34c8-c385b566ea05"
  }
}

以下是 cURL POST 请求的示例，该请求创建了一个新的 Order 实例：

curl -H "Authorization: Bearer d335902c-9cb4-455e-bf92-24ca1d66d72f" -H "Content-Type: application/json" -X POST -d "{\"date\": \"2018-10-12 15:47:28\", \"amount\":  9.90, \"customer\": {\"id\": \"383ebce2-b295-7378-36a1-bcf93693821f\"}}" http://localhost:8080/app/rest/v2/entities/sales$Order

订单项（items）集合和 customer 的引用需要通过请求体传递。我们来看看如何处理这些属性。

首先，我们快速浏览一下 Order 类：

package com.company.sales.entity;

import com.haulmont.chile.core.annotations.Composition;
import com.haulmont.chile.core.annotations.NamePattern;
import com.haulmont.cuba.core.entity.StandardEntity;
import com.haulmont.cuba.core.entity.annotation.OnDelete;
import com.haulmont.cuba.core.global.DeletePolicy;

import javax.persistence.*;
import java.util.Date;
import java.util.Set;

@NamePattern("%s|number")
@Table(name = "SALES_ORDER")
@Entity(name = "sales$Order")
public class Order extends StandardEntity {
    private static final long serialVersionUID = 7565070704618724997L;

    @Column(name = "NUMBER_")
    protected String number;

    @Temporal(TemporalType.DATE)
    @Column(name = "DATE_")
    protected Date date;

    @Column(name = "DESCRIPTION")
    protected String description;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "CUSTOMER_ID")
    protected Customer customer;

    @Composition
    @OnDelete(DeletePolicy.CASCADE)
    @OneToMany(mappedBy = "order")
    protected Set<OrderItem> items;

    //getters and setters omitted
}

items 集合属性使用 @Composition 注解。用于实体创建和更新的 REST API 方法将为此类集合的所有成员创建新的实体实例。在我们的例子中，将使用 Order 实体创建两个 OrderItem 实体实例。

customer 引用没有 @Composition 注解，这也是为什么 REST API 会尝试查找具有给定 id 的客户并将其设置给 customer 字段。如果未找到客户，则不会创建订单，并且该方法将返回错误。

在成功执行方法的情况下，返回所创建实体的完整对象关系图：

{
  "_entityName": "sales$Order",
  "id": "5d7ff8e3-7828-ba94-d6ba-155c5c4f2a50",
  "date": "2016-09-01",
  "description": "Back to school",
  "version": 1,
  "number": "00017",
  "createdBy": "admin",
  "createTs": "2016-10-13 18:12:21.047",
  "updateTs": "2016-10-13 18:12:21.047",
  "items": [
    {
      "_entityName": "sales$OrderItem",
      "id": "3158b8ed-7b7a-568e-aec5-0822c3ebbc24",
      "createdBy": "admin",
      "price": 9.9,
      "name": "Pencils",
      "createTs": "2016-10-13 18:12:21.047",
      "version": 1,
      "updateTs": "2016-10-13 18:12:21.047",
      "order": {
        "_entityName": "sales$Order",
        "id": "5d7ff8e3-7828-ba94-d6ba-155c5c4f2a50"
      }
    },
    {
      "_entityName": "sales$OrderItem",
      "id": "72774b8b-4fea-6403-7b52-4a6a749215fc",
      "createdBy": "admin",
      "price": 100,
      "name": "School bag",
      "createTs": "2016-10-13 18:12:21.047",
      "version": 1,
      "updateTs": "2016-10-13 18:12:21.047",
      "order": {
        "_entityName": "sales$Order",
        "id": "5d7ff8e3-7828-ba94-d6ba-155c5c4f2a50"
      }
    }
  ],
  "customer": {
    "_entityName": "sales$Customer",
    "id": "4aa9a9d8-01df-c8df-34c8-c385b566ea05",
    "firstName": "Toby",
    "lastName": "Burns",
    "createdBy": "admin",
    "createTs": "2016-10-13 15:32:01.657",
    "version": 1,
    "updateTs": "2016-10-13 15:32:01.657"
  }
}