在Spring Boot中使用InheritanceType.JOINED from JPA和Spring Data Rest时，如何将子实体合并到单个_嵌入式阵列中？

我在SpringBoot1.5.10中使用SpringDataJPA和SpringDataREST。我有三个用

@Entity

注释的类：

Message

、

AMessage

和

BMessage

（图2、3、4）。类

AMessage

和

BMessage

extend

Message

class（图1）。我有一个

MessageRepository

，它通过SpringDataREST公开。当我请求在

http://host:port/messages

，即使我正在从

/messages

端点检索数据，我也会得到一个响应，该响应在

\u embedded

对象下包含两个单独的数组（一个用于AMessage，一个用于BMessage）（图5）。我只想从

消息

实体中检索列。如何做到这一点

我已将我的代码上载到

图1:层次结构

           Message
              |
   ----------------------
   |                    |
AMessage             BMessage

图2:消息类（父级）

图3:消息类（子类）

图4:b消息类（子类）

图5:获取消息响应（A消息和B消息分开）

http://localhost:8080/messages

{
  "_embedded": {
    "aMessages": [
      {
        "messageColumn1": "MColumn1",
        "messageType": "A",
        "messageAColumn1": "AColumn1",
        "_links": {
          "self": {
            "href": "http://localhost:8080/aMessage/1"
          },
          "aMessage": {
            "href": "http://localhost:8080/aMessage/1"
          }
        }
      }
    ],
    "bMessages": [
      {
        "messageColumn1": "MColumn1",
        "messageType": "B",
        "messageBColumn1": "BColumn1",
        "_links": {
          "self": {
            "href": "http://localhost:8080/bMessage/2"
          },
          "bMessage": {
            "href": "http://localhost:8080/bMessage/2"
          }
        }
      }
    ]
  },
  "_links": {
    "self": {
      "href": "http://localhost:8080/messages{?page,size,sort}",
      "templated": true
    },
    "profile": {
      "href": "http://localhost:8080/profile/messages"
    }
  },
  "page": {
    "size": 20,
    "totalElements": 2,
    "totalPages": 1,
    "number": 0
  }
}

{
  "_embedded": {
    "messages": [
      {
        "messageColumn1": "MColumn1",
        "messageType": "A",
        "messageAColumn1": "AColumn1",
        "_links": {
          "self": {
            "href": "http://localhost:8080/aMessages/1"
          },
          "aMessage": {
            "href": "http://localhost:8080/aMessages/1"
          }
        }
      },
      {
        "messageColumn1": "MColumn1",
        "messageType": "B",
        "messageBColumn1": "BColumn1",
        "_links": {
          "self": {
            "href": "http://localhost:8080/bMessages/2"
          },
          "aMessages": {
            "href": "http://localhost:8080/bMessages/2"
          }
        }
      }
    ]
  },
  "_links": {
    "self": {
      "href": "http://localhost:8080/messages{?page,size,sort}",
      "templated": true
    },
    "profile": {
      "href": "http://localhost:8080/profile/messages"
    }
  },
  "page": {
    "size": 20,
    "totalElements": 2,
    "totalPages": 1,
    "number": 0
  }
}

---

决心！为

AMessage

和

BMessage

创建了新的存储库。用

@RepositoryRestResource（collectionResourceRel=“messages”）

注释每个存储库。这导致在

上执行
GET
时，消息被合并到
\u嵌入式
对象下的单个数组中http://localhost:8080/messages

{
  "_embedded": {
    "aMessages": [
      {
        "messageColumn1": "MColumn1",
        "messageType": "A",
        "messageAColumn1": "AColumn1",
        "_links": {
          "self": {
            "href": "http://localhost:8080/aMessage/1"
          },
          "aMessage": {
            "href": "http://localhost:8080/aMessage/1"
          }
        }
      }
    ],
    "bMessages": [
      {
        "messageColumn1": "MColumn1",
        "messageType": "B",
        "messageBColumn1": "BColumn1",
        "_links": {
          "self": {
            "href": "http://localhost:8080/bMessage/2"
          },
          "bMessage": {
            "href": "http://localhost:8080/bMessage/2"
          }
        }
      }
    ]
  },
  "_links": {
    "self": {
      "href": "http://localhost:8080/messages{?page,size,sort}",
      "templated": true
    },
    "profile": {
      "href": "http://localhost:8080/profile/messages"
    }
  },
  "page": {
    "size": 20,
    "totalElements": 2,
    "totalPages": 1,
    "number": 0
  }
}

{
  "_embedded": {
    "messages": [
      {
        "messageColumn1": "MColumn1",
        "messageType": "A",
        "messageAColumn1": "AColumn1",
        "_links": {
          "self": {
            "href": "http://localhost:8080/aMessages/1"
          },
          "aMessage": {
            "href": "http://localhost:8080/aMessages/1"
          }
        }
      },
      {
        "messageColumn1": "MColumn1",
        "messageType": "B",
        "messageBColumn1": "BColumn1",
        "_links": {
          "self": {
            "href": "http://localhost:8080/bMessages/2"
          },
          "aMessages": {
            "href": "http://localhost:8080/bMessages/2"
          }
        }
      }
    ]
  },
  "_links": {
    "self": {
      "href": "http://localhost:8080/messages{?page,size,sort}",
      "templated": true
    },
    "profile": {
      "href": "http://localhost:8080/profile/messages"
    }
  },
  "page": {
    "size": 20,
    "totalElements": 2,
    "totalPages": 1,
    "number": 0
  }
}

{
  "_embedded": {
    "messages": [
      {
        "messageColumn1": "MColumn1",
        "messageType": "A",
        "messageAColumn1": "AColumn1",
        "_links": {
          "self": {
            "href": "http://localhost:8080/aMessages/1"
          },
          "aMessage": {
            "href": "http://localhost:8080/aMessages/1"
          }
        }
      },
      {
        "messageColumn1": "MColumn1",
        "messageType": "B",
        "messageBColumn1": "BColumn1",
        "_links": {
          "self": {
            "href": "http://localhost:8080/bMessages/2"
          },
          "aMessages": {
            "href": "http://localhost:8080/bMessages/2"
          }
        }
      }
    ]
  },
  "_links": {
    "self": {
      "href": "http://localhost:8080/messages{?page,size,sort}",
      "templated": true
    },
    "profile": {
      "href": "http://localhost:8080/profile/messages"
    }
  },
  "page": {
    "size": 20,
    "totalElements": 2,
    "totalPages": 1,
    "number": 0
  }
}