root
|
@--reviews
|
|
@--postABC // postId
|
|
@--reviewXYZ // ***I want everything under this reviewUID
| |
| |--buyerUID: "01010"
| |--text: "fast shipping!"
| |
| @--responseTUV // responseUID
| |
| |--sellerUID: "212555"
| |--text: "we aim to please"
|
@--reviewEFG // this review is from a totally different user I don't want anything from here
我的数据库设置如上。有时我只有买家 uid,以便提取我使用的数据.queryOrdered(byChild: "buyerUID").queryEqual(toValue: "01010")
我可以从该特定帖子及其评论中找到买家。
一旦找到买家,如何才能获得该节点(reviewXYZ)下与买家相关的所有其他 k/v?
let reviewsRef = Database.database().reference()?
.child("reviews")
.child("postABC")
.queryOrdered(byChild: "buyerUID")
.queryEqual(toValue: "01010")
reviewsRef?.observeSingleEvent(of: .value, with: { [weak self](snapshot) in
print(snapshot.key) // prints postABC
print(snapshot.value) // prints a dictionary with reviewXYZ as the key and everything underneath it as a value
guard let dict = snapshot.value as? [String: Any] else { return }
})
The DataSnapshot class https://firebase.google.com/docs/reference/swift/firebasedatabase/api/reference/Classes/DataSnapshot有内置方法来循环其子项。
reviewsRef?.observeSingleEvent(of: .value, with: { [weak self](snapshot) in
for child in snapshot.children {
let snap = child as! DataSnapshot;
print(snap.key)
print(snap.value)
print(snap.childSnapshot(forPath: "buyerUID").value)
}
})
另请参阅其他在 Swift 中循环 Firebase 子节点的搜索结果 https://www.google.com/search?q=firebase+swift+loop+over+children.
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