当新数据添加到特定子数据库时，如何使用云函数将数据写入Firebase实时数据库

Question

MyLike myLike = new MyLike(userId, System.currentTimeMillis();
         FirebaseDatabase.getInstance().getReference().child("myLikes").child(userId).child(System.currentTimeMillis()).setValue(myLike);

exports.whoLikedMe = functions.database.ref('/myLikes/{userId}')
    .onWrite((change, context) => {
      // Only edit data when it is first created.
      if (change.before.exists()) {
        return null;
      }
      // Exit when the data is deleted.
      if (!change.after.exists()) {
        return null;
      }
      // Grab the current value of what was written to the Realtime Database.
      const data2 = change.after.val();
      const likedDate = data2.date;
      const myUserId = data2.I_Liked_UserId;
      var likedMe = {
            date: likedDate,
            Who_Liked_Me_UserId: myUserId,
        }

      //get the current date in millis  
      var hrTime = process.hrtime();
      const dateMillis = hrTime[0];
      return admin.database().ref('/WholikedMe/'+myUserId+'/'+hrTime[0]).set(likedMe);
    });

exports.whoLikedMe = functions.database.ref('/myLikes/{userId}')

exports.whoLikedMe = functions.database.ref('/myLikes/{userId}/915170400000')

Answer 1

在以下行中使用通配符语法（花括号）：

return change.after.ref('/WholikedMe/{myUserId}/{hrTime[0]}').set(likeMe)

该语法不适用于set语句。您需要使用：

return change.after.ref('/WholikedMe/' + myUserId + '/' + hrTime[0]).set(likeMe)

...我想，在我的手机上做这个不能再检查了。-）