添加Firebase数据，点和正斜杠 [英] Adding Firebase data, dots and forward slashes

问题描述

我尝试使用 firebase db，
我发现了非常重要的限制，这些限制都没有描述第一个问题是符号：点'。'禁止在键，

即firebase 拒绝（原因不明）下一个：

  nameRef.child（'Henry.Morgan@caribbean .SEA '）设置为（' Pirat'）; 
  

当您尝试添加/，
时，这样的键

  {'02 / 10/2013'：true} 
  

在firebase中，您可以看到：

$ p $ '02' ：{
'10'：{
'2013'：true
}
}


你有什么想法如何解决（自动）？
可能会设置一些标志，它是所有符号的字符串键？
当然，我可以在每次读写之前解析/恢复数据，但是...

顺便说一下'。''/' - firebase的所有限制符号？

解决方案

添加子元素 02/10/2013 code>在Firebase中创建一个结构是因为正斜杠导致创建一个新的级别。因此，我假设你使用类似的东西： firebaseRef.child（'02 / 10/2013'）。set（true） 相当于 firebaseRef.child（'02'）。child（'10'）。child（'2013'）.set（true） 。

为了避免在引用键名称中使用下列字符的问题（资源），

• 。 （期间）
  $（美元符号）
  
• [（左方括号）


• ]（右方括号）
  
• ＃（散列或英镑符号）
  
• /（正斜杠）
  
  

我们可以使用JavaScript内置的编码函数之一，因为据我所知，Firebase没有提供内置的这样做的方法。下面是一个看看哪个是最有效的我们的目的：
$ b $ pre $ var forbiddenChars ='。$ []＃ ; //包含禁止的字符
escape（forbiddenChars）; //结果为。％24％5B％5D％23 /
encodeURI（forbiddenChars）; // result in。％24％5B％5D％23％2F
encodeURIComponent（forbiddenChars）; //结果是。％24％5B％5D％23％2F


显然，有效的解决方案是 encodeURIComponent 。但是，它并不能解决我们所有的问题。上面的测试显示。字符仍然存在问题，并尝试使用 encodeURIComponent 测试电子邮件地址。我的建议是在 encodeURIComponent 之后链接一个替换函数来处理句点。

以下是您的两个示例的解决方案：

  encodeURIComponent（'[e-mail]'）。replace（/\./g,'%2E'）//结果是Henry％2EMorgan％40caribbean％2Esea
 encodeURIComponent（'02 /二千零十三分之一十' ）; //结果为02％2F10％2F2013​​
  

由于最终结果对于插入一个Firebase作为一个关键的名字，唯一的另外一个问题就是从Firebase中读取数据，然后用替换（'％2E'，'。'）和一个简单的 decodeURIComponent（...）。

I try to use firebase db, I found very important restrictions, which are not described in firebase help or FAQ.

First problem is that symbol: dot '.' prohibited in keys,

i.e. firebase reject (with unknown reason) next:

        nameRef.child('[e-mail]').set('Pirat');

Second problem with forward slashes in your keys '/', when you try to add key like this

        {'02/10/2013': true}

In firebase you can see:

         '02': {
             '10': {
                 '2013': true
             }
         }       

Have you got any ideas how to solve it (automatically)? May be set some flag that it is string key with all symbols? Of course, I can parse/restore data every time before write and after read, but...

By the way '.' '/' - all restricted symbols for firebase ?

解决方案

The reason that adding a child 02/10/2013 creates a structure in Firebase is because the forward slashes are resulting in the creation of a new level.

So the line I assume you are using something similar to: firebaseRef.child('02/10/2013').set(true) is equivalent to firebaseRef.child('02').child('10').child('2013').set(true).

To avoid the problems of not being able to use the following characters in reference key names (source),

• . (period)
• $ (dollar sign)
• [ (left square bracket)
• ] (right square bracket)
• # (hash or pound sign)
• / (forward slash)

we can use one of JavaScript's built in encoding functions since as far as I can tell, Firebase does not provide a built in method to do so. Here's a run-through to see which is the most effective for our purposes:

var forbiddenChars = '.$[]#/'; //contains the forbidden characters
escape(forbiddenChars); //results in ".%24%5B%5D%23/"
encodeURI(forbiddenChars); //results in ".%24%5B%5D%23%2F"
encodeURIComponent(forbiddenChars); //results in ".%24%5B%5D%23%2F"

Evidently, the most effective solution is encodeURIComponent. However, it doesn't solve all our problems. The . character still poses a problem as shown by the above test and trying to encodeURIComponent your test e-mail address. My suggestion would be to chain a replace function after the encodeURIComponent to deal with the periods.

Here's what the solution would look like for your two example cases:

encodeURIComponent('[e-mail]').replace(/\./g, '%2E') //results in "Henry%2EMorgan%40caribbean%2Esea"
encodeURIComponent('02/10/2013'); //results in "02%2F10%2F2013"

Since both the final results are safe for insertion into a Firebase as a key name, the only other concern is decoding after reading from a Firebase which can be solved with replace('%2E', '.') and a simple decodeURIComponent(...).

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