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Time Stamp as key in firebase firestore document

I want to save data on Firebase Firestore where the key will be timestamp:

await FirebaseFirestore.instance
      .collection("users")
      .doc(uid)
      .collection('data')
      .doc(device.id)
      .update({
    DateTime.now().toString(): "${result['humidity']}_${result['tempInC']}"
  });
}

What can be the possible reasons for this nested hierarchy as shown in the image: Screenshot, any solution?

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2

Answers


  1. Chosen as BEST ANSWER
    0

    Using milli_seconds_since_epoch is better alternative in such scenarios.


  2. 0

    According to my first question in the comments section:

    Do you need to save a Date object as a key inside a document in Firestore?

    And your answer:

    yeah @AlexMamo

    Please note that there is no way you can save a Date/Timestamp object as a key in a Firestore document. The keys are always strings. You can indeed convert the Date object into a String, but I don’t think this is what you’re looking for.

    The best option I can think of would be to save the timestamp as a value and not as a key. For example, you can add a field called addedAt that should hold a Firestore timestamp. In this way, you’ll be able to query the collection using Timestamp objects.

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