如何从firebase中删除帖子?迅速 [英] how to delete post from firebase? Swift
问题描述
我一直在尝试很多事情，并且在互联网上进行了大量搜索，但是由于代码的设置方式，我找不到能帮助我的解决方案.
I have been trying a lot of things and I have been searching a lot on the internet but I can't find a solution that helps me because of how my code is set up.
任何我一直试图删除帖子的方法，但是我真的不知道该怎么做，因为我的帖子是通过firebase生成的自动ID上传的，我也不知道在这里写些什么
Any how I have been trying to delete posts but I don't really know how to do this since my posts are uploaded in a Auto Id generated by firebase and I dont know what to write here
Database.database().reference.child("posts").child("HERE IS THE AUTO ID").removeValue
我怎么得到这个?请帮助我，我已经为这个问题困扰了一段时间.我不知道如何获得autoid.
How do I get this? Please help me I have been stuck for this problem a while now. I have no clue how to get the autoid.
这就是我上传帖子的方式
this is how I upload the post
if (self.imageFileName != "") {
if choosenCountryLabel.text == "Albania" {
// image has finshed the uploading, Saving Post!!!
if let uid = Auth.auth().currentUser?.uid {
Database.database().reference().child("users").child(uid).observeSingleEvent(of: .value, with: { (snapshot) in
if let userDictionary = snapshot.value as? [String: AnyObject] {
for user in userDictionary{
if let username = user.value as? String {
if let streetAdress = self.locationAdressTextField.text {
if let title = self.titleTextField.text {
if let content = self.contentTextView.text {
let postObject: Dictionary<String, Any> = [
"uid" : uid,
"title" : title,
"content" : content,
"username" : username,
"time" : self.timeStamps,
"timeorder" : self.secondTimeStamps,
"image" : self.imageFileName,
"adress" : streetAdress,
"postAutoID" : self.postAutoID
]
let postID = Database.database().reference().child("posts").childByAutoId()
let postID2 = Database.database().reference().child("AlbaniaPosts").childByAutoId()
let postID3 = Database.database().reference().child(uid).childByAutoId()
postID.setValue(postObject)
postID2.setValue(postObject)
postID3.setValue(postObject)
let postAutoID = postID.key
let postAutoID2 = postID2.key
let postAutoID3 = postID3.key
print(postAutoID)
print(postAutoID2)
print(postAutoID3)
let alertPosting = UIAlertController(title: "Successfull upload", message: "Your acty was successfully uploaded.", preferredStyle: .alert)
alertPosting.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
let vc = self.storyboard?.instantiateViewController(withIdentifier: "AlbaniaVC")
self.present(vc!, animated: true, completion: nil)
}))
self.present(alertPosting, animated: true, completion: nil)
print("Posted Succesfully to Firebase, Saving Post!!!")
}
}
}
}
}
}
})
}
}
}else{
let alertNotPosting = UIAlertController(title: "Seems like you got connection problems", message: "Your image has not been uploaded. Please Wait 10 seconds and try again.", preferredStyle: .alert)
alertNotPosting.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
self.present(alertNotPosting, animated: true, completion: nil)
}
推荐答案
在查询数据时必须保存自动ID，或者在上传信息时必须将其保存在帖子中.
You have to save the autoID when you query your data or you have to save the key inside the post when you upload it.
如果要在查询时获取密钥.您可以执行以下操作:
If want to get the key when you query. You can do something like this:
let ref = Database.database().reference()
ref.child("posts").queryLimited(toLast: 7).observeSingleEvent(of: .value, with: { snap in
for child in snap.children {
let child = child as? DataSnapshot
if let key = child?.key { // save this value in your post object
if let post = child?.value as? [String: AnyObject] {
if let adress = post["adress"] as? String, let title = post["title"] as? String { // add the rest of your data
// create an object and store in your data array
}
}
}
}
})
请注意，以上查询仅获取最近的7条帖子.如果您想继续获得更多，则需要研究分页.
Note the above query only gets the last 7 posts. If you want to continue to get more you'll need to look into pagination.
如果要将ID保存在帖子中，只需在上传时将其添加即可，如下所示:
If you want to save the id in your posts you just add it when you upload like this:
let key = ref.child("posts").childByAutoId().key
let post = ["adress": adress,
"content": content,
"postID": key] as [String: Any]
let postFeed = ["\(key)" : feed]
ref.child("posts").updateChildValues(postFeed, withCompletionBlock: { (error, success) in
if error != nil {
// report the error
}
else {
// everything is fine
}
})
然后，当您查询时，您可以执行以下操作:
Then when you query you can do something like this:
let ref = Database.database().reference()
ref.child("posts").observeSingleEvent(of: .value, with: { snap in
for child in snap.children {
if let post = child?.value as? [String: AnyObject] {
if let postID = post["postID"] as? String {
// save this key in a post object so you can access it later to delete
}
}
}
})
现在假设您创建了一个名为post的对象，则可以使用以下内容删除该帖子
Now assuming you created an object called post you can delete that post using
ref.child("posts").child(post.postID).removeValue(completionBlock: { (error, refer) in
if error != nil {
// failed to delete post
}
else {
// delete worked
}
})
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