Firebase 如何比较数据规则中的变量（== vs ===）？

Question

Information that is given below is straight from Firebase website.

{
  "rules": {
    "users": {
      "$user": {
        ".read": "auth.uid === $user",
        ".write": "auth.uid === $user"
      }
    }
  }
}

When a client tries to access /users/barney, the $user default location will match with $user being equal to "barney". So the .read rule will check if auth.uid === 'barney'. As a result, reading /users/barney will succeed only if the client is authenticated with a uid of "barney".

Firebase 擅长记录，但我没有找到任何关于使用“==”或“===”的深入讨论。据我所知，它的工作原理与 JavaScript 一样。

根据他们的文档

if auth.uid === 'barney'. As a result, reading /users/barney will succeed only if the client is authenticated with a uid of "barney".

有时我见过

"$user": {
        ".read": "auth.uid == $user",
        ".write": "auth.uid == $user"
 }

所以我的问题是哪一个是正确的方法？当我们在规则中使用“==”和“===”时会发生什么？

Answer 1

我认为 Firebase 将所有 === 视为 ==（同样将所有 !== 视为 !=）。

我的证据是 Bolt Compiler 将 bolt 文件中的三重运算符转换为规则 JSON 输出中的双重运算符。

Answer 2

如果您查阅 Firebase 数据库安全规则 API documentation, you will see the following definitions for equals:

=== (equals)

...
Note:: == IS TREATED AS ===. If you use == in your security rules, it will be translated to === when the rules are run.

和 not equals:

!== (not equals)

...
Note: != IS TREATED AS !==. If you use != in your security rules, it will be translated to !== when the rules are run.

Firebase 如何比较数据规则中的变量（== vs ===）？

How does Firebase compares a variable (== vs ===) in Data Rules?

javascript

firebase

comparison

firebase-authentication

firebase-security

=== (equals)

!== (not equals)