列出所有未引用的现有子集合[重复]

subCollection1 和 subCollection2 ?

rootCollection {
    aDocument: {
        someField: { value: 1 },
        anotherField: { value: 2 }
        subCollection1: ...,
        subCollection2: ...,
    }
}

我希望我能直接读取 aDocument ,但当我 get() 文件。

rootRef.doc('aDocument').get()
  .then(doc =>

    // only logs [ "someField", "anotherField" ], no collections
    console.log( Object.keys(doc.data()) )
  )