将textfield.text与firebase字符串swift进行比较 [英] compare textfield.text to firebase string swift

问题描述

我有一个Firebase数据库，将有单独的用户节点。在每个用户的节点将是有关他们的数据，将是私人的。除此之外，我想创建一个仅仅是注册邮件集合的节点。原因是当用户在登录VC和用户键入一个电子邮件..如果电子邮件已经注册一个图像视图将变成绿色。但是，如果电子邮件不在数据库中（或者与电子邮件地址格式不匹配），图像将变为红色。

以前对我以前的问题的回答（s）说明我需要在电子邮件地址中将'。'更改为'，'。因此，@ gmail.com将被存储为gmail，com

我已经下了。

如果错误== nil {
（），createUser（withEmail：email，password：password，completion：{（user，error）in 
 
）{code> FIRAuth.auth 
 let email = firstContainerTextField.text ??
 
 let newString = email.replacingOccurrences（of：。，with：，，options：.literal，range：nil） 
 $ b $ self.ref.child（users）。child（allUsers）。child（newString）.setValue（true）
 
 self.ref.child（用户）。child（（user？.uid）！）。setValue（[Email：email]）
 
 FIRAuth.auth（）!. signIn（withEmail：email，
密码：密码）
 
}其他{
 //注册失败
} 
  

这是新用户VC（部分）的代码。

所以说users和allUsers的节点看起来像这样在Firebase控制台上

 用户
 allUs ers 
 bob @ bob，com：true 
 ted @ ted，com：true 
  

<真正的部分就是这样，我可以把bob @ bob，com放到数据库中，真正的部分永远不会被用到任何东西上。

在VC的日志中，我真的不知道该怎么办了。/ b>

以前的回答说使用

<$ p $ > hasChildren（）


然后我用google搜索了一下（
），我尝试过使用类似这样的东西

$ ref $ {code $ ref.child（users）。child（allUsers ）.queryEqual（toValue：newString）
.observe（.value，其中：$快照
$ b $如果snapshot.hasChildren（）{

for child in snapshot.children.allObjects as！ [FIRDataSnapshot] {
....


}



}）;

但是我似乎无法得到任何结果。

我怎样才能简单地看到一个textfield.text ==一个电子邮件已经存储在firebase中？

（我已经将'。'转换为' '比较时）

解决方案

请不要使用电子邮件地址作为键。电子邮件地址是动态的，并且可能会改变（如果用户想要改变它），如果他们这样做了，那么你将会手忙脚乱，因为直接使用该电子邮件的每个节点都将被删除并重新创建。 / p>

最好的做法是将key和它所包含的数据分开。

这里是使用的结构

 电子邮件
 -Yiaisjpa90is 
电子邮件：[e-mail]
 -Yijs9a9js09a 
 email：[e-mail]
  

然后您只需查询电子邮件节点寻找和处理，如果存在的话。

和一些代码

 <$ c $ queryEqual（toValue：[e-mail]）
 .observe（.value，其中：{snapshot in $ b $ if snapshot.value is NSNull {
 print（快照为空，没有找到电子邮件）
} else {
 print（email found，YIPEE）
} 
 
 
 
 $ b $ p 
 $ b 
为了保持完整性，使用
 
 $ b $ pre $ 如果snapshot.exists（）{
 print（found it）
} else {
 print （找不到电子邮件）
} 
  

I have a database in Firebase that will have individual user nodes. In each user's node will be data pertaining to them and will be private. In addition to that I want to create a node that is JUST a collection of registered emails. The reason is when a user is on the Sign In VC and the user types an email in..If the email is already registered an image view will turn green. However, if the email is not in the database (or if it doesn't match email address format) the image will be red.

A previous answer on my previous question(s) illustrated that I need to change the '.' to a ',' in email addresses. So @gmail.com would be stored as gmail,com

I have that down.

FIRAuth.auth()?.createUser(withEmail: email, password: password, completion: { (user, error) in

    if error == nil {

      let email = firstContainerTextField.text ?? ""

      let newString = email.replacingOccurrences(of: ".", with: ",", options: .literal, range: nil)

      self.ref.child("users").child("allUsers").child(newString).setValue(true)

      self.ref.child("users").child((user?.uid)!).setValue(["Email": email])

      FIRAuth.auth()!.signIn(withEmail: email,
                             password: password)

    } else {
      //registration failure
    }

This is the code from the New User VC (partial).

So the node that says "users" and "allUsers" looks like this on Firebase Console

users
    allUsers
        bob@bob,com: true
        ted@ted,com: true

The 'true' part was just so I could get the bob@bob,com onto the database...the true part will never be used for anything.

On the log in VC I honestly cannot figure out what to do

A previous answer said to use

hasChildren() 

And I used that and then googled what to do with that and I tried using something like this

ref.child("users").child("allUsers").queryEqual(toValue: newString)
  .observe(.value, with: { snapshot in

if snapshot.hasChildren() {

    for child in snapshot.children.allObjects as! [FIRDataSnapshot] {
    ....


}



  });

But I just cannot seem to get anywhere with it.

How can I simply see if a textfield.text == an email already stored in firebase?

(I did convert the '.' to ',' when comparing)

解决方案

Please don't use email addresses as keys. Email addresses are dynamic and may change (as in if the users wants to change it) and if they do, you'll have a mess on your hands as every node that directly used that email would have be deleted and re-created.

Best practice is to disassociate key's from the data they contain.

Here's the structure to use

emails
  -Yiaisjpa90is
    email: "[e-mail]"
  -Yijs9a9js09a
    email: "[e-mail]"

then you simply query the email node for the email you are looking for, and handle accordingly if it exists.

And some code

emailsRef.queryOrdered(byChild: "email").queryEqual(toValue: "[e-mail]")
         .observe(.value, with: { snapshot in
     if snapshot.value is NSNull {
        print("the snapshot was null, no email found")
     } else {
        print("email was found, YIPEE")
     }  
})

For completeness it would be a little more Swifty to use

if snapshot.exists() {
  print("found it")
} else {
  print("no email found")
}

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