Angular 服务中的Apollo GraphQL查询重复集合项？

我在Angular 6应用程序的服务中使用了以下方法：

  public getPupilReport(): Observable<PupilReport> {
    return this.apollo.query<any>({
      query: gql`
            query query {
              pupilReports {
                new {
                  date
                  pupilReportTemplateId
                  pupilReportTemplate {
                    id
                    name
                    sortedPupilAttributeCollections {
                      sortOrder
                      pupilAttributeCollection {
                        id
                        name
                        sortedPupilAttributes {
                          sortOrder
                          pupilAttribute {
                            id
                            name
                            type
                          }
                        }
                      }
                    }
                  }
                }
              }
            }`,
    })
      .pipe(map(result => {
        var pupilReport = new PupilReport();
        if (result && result.data.pupilReports.new) {
          pupilReport = result.data.pupilReports.new;
        }
        return pupilReport;
      }));
  }

当相同的查询从apollo查询返回时，我得到以下数据（pupiAttribute集合和pupiAttribute都有相同的数据）

我在检查apollo查询返回的pupilReport对象的基础上解释第二组数据

---

有人能解释为什么会这样吗？来自集合本身的数据在服务器中是硬编码的，因此第二组数据不可能是正确的。我只能假设它与缓存有关。

重复数据的原因是阿波罗缓存系统正确地完成了它的工作

阿波罗通过它的_类型名和id（或_id）字段来识别一个对象。由于硬编码测试数据中的错误，存在具有重复ID的对象。更正我的数据，使相同类型的所有对象都具有唯一的ID（正如它们应该的那样）修复了此问题

如果id字段不可用或预期会复制id，则可以向InMemoryCache构造函数提供自定义dataIdFromObject函数，以告知Apollo如何正确规范化此类对象

请参阅以获得更好的解释

  "data": {
    "pupilReports": {
      "new": {
        "date": "0001-01-01",
        "pupilReportTemplateId": 0,
        "pupilReportTemplate": {
          "id": 99,
          "name": "KS3 Science",
          "sortedPupilAttributeCollections": [
            {
              "sortOrder": 1,
              "pupilAttributeCollection": {
                "id": 1,
                "name": "Attainment",
                "sortedPupilAttributes": [
                  {
                    "sortOrder": 1,
                    "pupilAttribute": {
                      "id": 1,
                      "name": "Physics",
                      "type": "Boolean"
                    }
                  },
                  {
                    "sortOrder": 2,
                    "pupilAttribute": {
                      "id": 1,
                      "name": "Biology",
                      "type": "Int32"
                    }
                  }
                ]
              }
            },
            {
              "sortOrder": 2,
              "pupilAttributeCollection": {
                "id": 1,
                "name": "Behaviour",
                "sortedPupilAttributes": [
                  {
                    "sortOrder": 1,
                    "pupilAttribute": {
                      "id": 3,
                      "name": "Attitude",
                      "type": "Int32"
                    }
                  },
                  {
                    "sortOrder": 2,
                    "pupilAttribute": {
                      "id": 4,
                      "name": "Effort",
                      "type": "Boolean"
                    }
                  }
                ]
              }
            }
          ]
        }
      }
    }
  }

  "data": {
    "pupilReports": {
      "new": {
        "date": "0001-01-01",
        "pupilReportTemplateId": 0,
        "pupilReportTemplate": {
          "id": 99,
          "name": "KS3 Science",
          "sortedPupilAttributeCollections": [
            {
              "sortOrder": 1,
              "pupilAttributeCollection": {
                "id": 1,
                "name": "Attainment",
                "sortedPupilAttributes": [
                  {
                    "sortOrder": 1,
                    "pupilAttribute": {
                      "id": 1,
                      "name": "Physics",
                      "type": "Boolean"
                    }
                  },
                  {
                    "sortOrder": 2,
                    "pupilAttribute": {
                      "id": 1,
                      "name": "Physics",
                      "type": "Boolean"
                    }
                  }
                ]
              }
            },
            {
              "sortOrder": 2,
              "pupilAttributeCollection": {
                "id": 1,
                "name": "Attainment",
                "sortedPupilAttributes": [
                  {
                    "sortOrder": 1,
                    "pupilAttribute": {
                      "id": 1,
                      "name": "Physics",
                      "type": "Boolean"
                    }
                  },
                  {
                    "sortOrder": 1,
                    "pupilAttribute": {
                      "id": 1,
                      "name": "Physics",
                      "type": "Boolean"
                    }
                  }
                ]
              }
            }
          ]
        }
      }
    }
  }