无法让 Firestore 规则 get() 在函数内工作 [英] Can't get Firestore Rules get() to work inside a function

问题描述

Firestore 与函数内的 get 不能很好地结合

Firestore doesn't work well with get inside a function

我有这个规定

service cloud.firestore {
  match /databases/{database}/documents {

    function isProjectOpenForAssign() {
      return get(/databases/$(database)/documents/projects/$(anyProject)).data.canAssignTask == true;
    }

    match /projects/{anyProject} {
      allow create: if request.auth != null;

      match /tasks/{anyTask} {
        allow create: if request.auth != null && (isProjectOpenForAssign());
      }
    }
  }
}

运行模拟器测试时，我得到:

When running the simulator testing it I get:

运行模拟时出错 — 错误:simulator.rules 行 [23]，列 [14].找不到函数错误:名称:[get].;错误:提供给调用的参数无效.函数:[get]，参数:["||invalid_argument||"]

Error running simulation — Error: simulator.rules line [23], column [14]. Function not found error: Name: [get].; Error: Invalid argument provided to call. Function: [get], Argument: ["||invalid_argument||"]

推荐答案

问题出在您定义函数的范围内.由于您将 isProjectOpenForAssign 定义在与此匹配 match/projects/{anyProject} 相同的级别，因此该函数将无法访问 anyProject.

The problem is in the scope of where you define your function. Since you define isProjectOpenForAssign at the same level as this match match /projects/{anyProject}, the function won't have access to anyProject.

有两种解决方案:

1. 将 anyProject 作为参数传递给 isProjectOpenForAssign.

function isProjectOpenForAssign(anyProject) {
  return get(/databases/$(database)/documents/projects/$(anyProject)).data.canAssignTask == true;
}

match /projects/{anyProject} {
  allow create: if request.auth != null;

  match /tasks/{anyTask} {
    allow create: if request.auth != null && (isProjectOpenForAssign(anyProject));
  }
}

在声明anyProject的匹配中定义函数.

match /projects/{anyProject} {
  function isProjectOpenForAssign() {
    return get(/databases/$(database)/documents/projects/$(anyProject)).data.canAssignTask == true;
  }

  allow create: if request.auth != null;

  match /tasks/{anyTask} {
    allow create: if request.auth != null && (isProjectOpenForAssign());
  }
}

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