Question

我已经构建了这个复合的whereField查询，但是由于某种原因，它似乎没有应用任何过滤器。我使用searchCriteria字段将动态数据传递到whereFields中。这是正确的更改，但是无论组合如何，我总是会取回所有记录。知道发生了什么吗？

    let dbCollection = db.collection(Constants.FirebaseFirestore.COLLECTION_ITEM)

    dbCollection.whereField(Constants.FirebaseFirestore.ITEM_OWNER_FIELD, isEqualTo: searchCriteria.owner)

    dbCollection.whereField(Constants.FirebaseFirestore.ITEM_CATEGORY_FIELD, isEqualTo: searchCriteria.category)
    dbCollection.order(by: Constants.FirebaseFirestore.ITEM_DATE_CREATED_FIELD, descending: false)

数据

category "need" (string)
count 10
date_created 1586663033.023617
name "Needs 1"
owner "INvSUJyBwecZgZg0o33dLu3VgGt2"

category "stock" (string)
count 10
date_created 1586664033.023617
name "Stock 1"
owner "INvSUJyBwecZgZg0o33dLu3VgGt2"

Answer 1

在Query上调用whereField不会更改您调用它的Query对象。它将应用过滤器创建一个新的Query对象。因此，您应该按照documentation中显示将它们链接在一起的模式进行操作：

let query = db
    .collection(Constants.FirebaseFirestore.COLLECTION_ITEM)
    .whereField(Constants.FirebaseFirestore.ITEM_OWNER_FIELD, isEqualTo: searchCriteria.owner)
    .whereField(Constants.FirebaseFirestore.ITEM_CATEGORY_FIELD, isEqualTo: searchCriteria.category)
    .order(by: Constants.FirebaseFirestore.ITEM_DATE_CREATED_FIELD, descending: false)

或者每次调用时都要记住新的查询对象：

var query = db.collection(Constants.FirebaseFirestore.COLLECTION_ITEM)
query = query.whereField(Constants.FirebaseFirestore.ITEM_OWNER_FIELD, isEqualTo: searchCriteria.owner)
query = query.whereField(Constants.FirebaseFirestore.ITEM_CATEGORY_FIELD, isEqualTo: searchCriteria.category)
query = query.order(by: Constants.FirebaseFirestore.ITEM_DATE_CREATED_FIELD, descending: false)

Firestore化合物whereField查询不起作用

1 个答案: