如
here所述,我想将Book对象存储在单独的ref中,并将其id值存储在User的books属性中
Users: user_id:121jhg12h12 email: "john@doe.com" name: "John Doe" profile_pic_path: "https://...". language: "en" exp_points: 1284 friends: [user_id] books: [[book_id,status,current_page,start_date,finish_date]] badges: [[badge_id,get_date]] Books: book_id: 3213jhg21 title: "For whom the bell tolls" author: "Ernest Hemingway" language: "en" pages_count: 690 ISBN: "21hjg1" year: 2007
每当我在应用程序中添加一本书时
self.ref!.child("Books").childByAutoId().setValue(["title": arrayOfNames[0] as! NSString,"author": arrayOfNames[1] as! NSString,"pages_count":arrayOfNames[2] as! NSString])
book对象是在Books ref中创建的,但我想立即将其id添加到User的用户书籍数组中.
可以用一些漂亮的方式完成,而不是查询书籍,检索它的ID并将其添加到数组中吗？
也许我不应该使用AutoId模式并在应用程序中为自己创建每个对象的唯一ID？
解决方法
您可以通过以下方式获取childByAutoId创建的密钥：
let newBookRef = self.ref!
.child("Books")
.childByAutoId()
let newBookId = newBookRef.key
let newBookData = [ "book_id": newBookId,"title": arrayOfNames[0] as! NSString,"pages_count":arrayOfNames[2] as! NSString ] newBookRef.setValue(newBookData)
