node.js - Firebase 无效的文档引用。文档引用必须有偶数个段

Question

这个查询有什么问题？

const db = firebase.firestore()
const query = db.doc(this.props.user.uid).collection('statements').orderBy('uploadedOn', 'desc').limit(50)

我收到以下错误:

Uncaught Error: Invalid document reference. Document references must have an even number of segments, but FrMd6Wqch8XJm32HihF14tl6Wui2 has 1
    at new FirestoreError (index.cjs.js:346)
    at Function.DocumentReference.forPath (index.cjs.js:15563)
    at Firestore.doc (index.cjs.js:15368)
    at UploadStatementPresentation.componentWillMount (UploadStatementPage.jsx:61)
    at UploadStatementPresentation.componentWillMount (createPrototypeProxy.js:44)
    at callComponentWillMount (react-dom.development.js:6872)
    at mountClassInstance (react-dom.development.js:6968)
    at updateClassComponent (react-dom.development.js:8337)
    at beginWork (react-dom.development.js:8982)
    at performUnitOfWork (react-dom.development.js:11814)

Answer 1

由于您没有具体说明您要查询的内容，我只是指出所有文档都必须在一个集合中，无一异常(exception)。所以，如果你这样说:

db.doc(this.props.user.uid)

Firestore 假定您传递给 doc() 的字符串包含集合和文档 ID，它们之间用斜线分隔。但这在您的情况下似乎极不可能。您需要确定 uid 在哪个集合中，并在构建对要查询的集合的引用时首先使用它。假设您在 uid 文档中确实有一个 statements 子集合，并且其他一些集合包含 uid 文档，您必须像这样指定完整路径:

db.collection('that-other-collection').doc(this.props.user.uid).collection('statements')

当然，只有您自己知道数据的实际结构。