我可以在firestore 查询中设置多个.whereEqualTo 指向文档中的字段吗？

Question

I have a document that has city as a field. I want to query a document which has

city == "Tokyo " and city == "Osaka" .

how to do that ?

I have tried this one:

query = ref
            .whereEqualTo(FIRESTORE_EVENT_FIELD_CITY,"Tokyo")
            .whereEqualTo(FIRESTORE_EVENT_FIELD_CITY,"Osaka")
            .whereEqualTo(FIRESTORE_EVENT_FIELD_IS_ACTIVE,true)
            .whereEqualTo(FIRESTORE_EVENT_FIELD_HAS_BEEN_APPROVED,false)
            .whereGreaterThanOrEqualTo(FIRESTORE_EVENT_FIELD_DATE_START_TIME,now.toDate())

          .whereLessThanOrEqualTo(FIRESTORE_EVENT_FIELD_DATE_START_TIME,oneMonthFromNow.toDate())
            .orderBy(FIRESTORE_EVENT_FIELD_DATE_START_TIME, Query.Direction.ASCENDING)
            .limit(limit)

but I don't receive any document, If I only set one query pointing to a city, like this only .whereEqualTo(FIRESTORE_EVENT_FIELD_CITY,"Tokyo") , then it works, but it only give me all documents that has tokyo in the city field

Answer 1

From the docs:

You can only perform range comparisons (<, <=, >, >=) on a single field, and you can include at most one array-contains or array-contains-any clause in a compound query

https://firebase.google.com/docs/firestore/query-data/queries

citiesRef.whereGreaterThanOrEqualTo("state", "CA")
        .whereLessThanOrEqualTo("state", "IN");
citiesRef.whereEqualTo("state", "CA")
        .whereGreaterThan("population", 1000000);

Answer 2

I am guessing when you say you want city == "Tokyo" and city == "Osaka" you meant OR . Firestore recently released OR logic

query = ref
        .whereIn(FIRESTORE_EVENT_FIELD_CITY,Arrays.asList("Tokyo", "Osaka"))
        .whereEqualTo(FIRESTORE_EVENT_FIELD_IS_ACTIVE,true)
        .whereEqualTo(FIRESTORE_EVENT_FIELD_HAS_BEEN_APPROVED,false)
 .whereGreaterThanOrEqualTo(FIRESTORE_EVENT_FIELD_DATE_START_TIME,now.toDate())
 .whereLessThanOrEqualTo(FIRESTORE_EVENT_FIELD_DATE_START_TIME,oneMonthFromNow.toDate())
        .orderBy(FIRESTORE_EVENT_FIELD_DATE_START_TIME, Query.Direction.ASCENDING)
        .limit(limit)

In your current query, you are not receiving any document because your first two where are mutually exclusive