Flutter firestore限制允许用户进行写入操作的次数

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    // 限制用户每天最多进行 10 次写入操作
    function isAllowedToWrite() {
      // 获取当前用户的 UID
      let uid = request.auth.uid;
      // 获取当前日期
      let currentDate = request.time.toDate();
      let currentDay = currentDate.getFullYear() + '-' + (currentDate.getMonth() + 1) + '-' + currentDate.getDate();
      
      // 获取用户当天的写入次数
      let userDocRef = /databases/$(database)/documents/users/$(uid);
      let userDoc = get(userDocRef);
      let writeCount = userDoc.data().writeCount[currentDay];
      
      // 判断写入次数是否超过限制
      return writeCount < 10;
    }
    
    // 定义写入操作的规则
    match /collection/{document} {
      allow write: if isAllowedToWrite();
    }
  }
}