如何从与特定字符串匹配的云 Firestore 中搜索和获取文档

Question

I'm trying to fetch a document from cloud firestore collection and display them in recycler view but here I'm unable to fetch the document with specific string. for ex- if my string is rice then all document items containing rice as name should be fetched.

I tried using this query:-

query = db.collection("Items").whereEqualTo(txt,true);

but it doesn't work I'm really confused any help will be appreciated.

Here's the screenshot of my database:

Answer 1

As I understand from your comments, you want to query the database based on substrings that can exist in the id of the documents but unfortunately this is not possible. The simplest solution I can think of is to add the id of the document as a property in your item object (document). So your schema should look like this:

Firestore-root
   |
   --- Items (collection)
         |
         --- Jeera Rice (document)
               |
               --- imageUrl: "https://..."
               |
               --- price: 70
               |
               --- documentId: "Jeera Rice"

Even if you'll do this way, you won't be able to search by substrings. To enable full text search of your Cloud Firestore data, use a third-party search service like Algolia. To achieve this in Android, please see my answer from the following post:

• Is it possible to use Algolia query in FirestoreRecyclerOptions?