在Firestore中存储标签的最有效方法是什么？

Question

NoSQL Firestore没有表，什么是最好的标记方式，只需将多个标记存储在数组中？

Answer 1

The NoSQL Firestore has no table.

That's right, the database is in a JSON format.

What will be the best way for tagging, just store multiple tags in array?

According to the use case of your app, you can choose between two approaches. If your tags are of type String, then you can store this literal strings in an array. This would be the first approach and the database schema might look like this:

Firestore-root
    |
    --- questions (collections)
          |
          --- questionId (document)
                 |
                 --- questionId: "02cubnmO1wqyz6yKg571"
                 |
                 --- title: "Question Title"
                 |
                 --- tags ["History", "Geography"]

As you can see, I took as an example a collection of questions in which each document has an array of tags.

If you need more details about a tag, the second approach would be to create an object for each tag and store this tag objects in a collection. In the question document, you'll only need to store the ids of the tags also in an array, as in the following schema:

Firestore-root
    |
    --- questions (collections)
    |     |
    |     --- questionId (document)
    |            |
    |            --- questionId: "02cubnmO1wqyz6yKg571"
    |            |
    |            --- title: "Question Title"
    |            |
    |            --- tags ["tagId", "tagId"]
    |
    --- tags (collections)
          |
          --- tagId (document)
          |     |
          |     --- tagId: "yR8iLzdBdylFkSzg1k4K"
          |     |
          |     --- tagName: "History"
          |     |
          |     --- //Other tag properties
          |
          --- tagId (document)
                |
                --- tagId: "tUjKPoq2dylFkSzg9cFg"
                |
                --- tagName: "Geography"
                |
                --- //Other tag properties