Question

我正在使用文档数据库（Google Cloud Firestore），并且我正在尝试获取深层嵌套对象集合的所有数据。我还没有办法通过一个简单的调用向Firestore询问所有数据。

我的数据如下所示

Assessment: {
    documentid: string
    name: string,
    email: string,
    responses: Response[]
}
Response: {
    documentid: string
    question: string,
    answer: string
}

因此，我试图从评估集中获取所有评估 - 这会带回所有数据，但会回复评估，因此我需要再次调用以获取该数据。

这是我目前正在使用的代码，但它只返回附带答复的1评估，而不是我期待的150。

this.db
  .collection("Assessments")
  .snapshotChanges()
  .pipe(
    //append the documentid to each assessment
    flatMap(actions => {
      return actions.map(a => {
        const assessment = a.payload.doc.data() as Assessment;
        assessment.documentid = a.payload.doc.id;
        return assessment as Assessment;
      });
    }),
    concatMap(assessment => {
      return (
        this.documentDB
          .collection("Assessments")
          .doc(assessment.documentid)
          .collection("Responses")
          .snapshotChanges()
          .pipe(
              //append the documentid to each response
              map(actions => {
                return actions.map(a => {
                  const response = a.payload.doc.data() as WfResponse;
                  response.documentid = a.payload.doc.id;
                  return response;
                });
              }),
              //append the responses to the originial assessment object
              .map(responses => {
                responses.sort(this.sortBySortOrder);
                assessment.responses = responses;
                return assessment;
              })
          );
      );
    })
  )
  .subscribe(assessments => {
    this.queryResult.push(assessments as Assessment);
  });

Answer 1

Google Cloud Firestore似乎不支持此功能。

此问题已在其他地方以其他方式提出，并且他们似乎始终确认Google Cloud Firestore仅支持浅层查询。

请参阅：

https://github.com/GoogleCloudPlatform/google-cloud-php/issues/761

Firestore get all docs and subcollections of root collection

获取具有多个调用的对象的数据

1 个答案: