如何遍历从 snapshot.val() 收到的数据并根据键将其推送到数组

2022-01-21 00:00:00 firebase javascript ionic-framework ionic3 angular

我想根据用户键循环从 snapshot.val() 收到的数据并将它们推送到数组中.我尝试在 for..in 这样的循环的帮助下做到这一点，

I want to loop through the data I receive from snapshot.val() based on user keys and push them into an array. I tried doing it with the help of for..in loop like this,

firebase.database().ref('interests').child("I would like to dine with").on('value', (snapshot) => {
  var data = snapshot.val();
  if(snapshot.exists()){
    for(let key in data){
      console.log("data[key]",data[key]);
      this.intVal.push(data[key]);
      console.log("intVal",this.intVal);
    }
  }
})

但我得到了这样的东西，

But I'm getting something like this,

如果您注意到，我的第一个数组在用户键下包含 1 个对象，而我的第二个数组在其用户键下包含 3 个对象.如何将每个值推送到单独的数组中?

If you notice, my first array contains 1 object under a user key and my second array contains 3 objects under their user keys. How can I push every single value in a separate array?

任何帮助将不胜感激！谢谢

Any help would be much appreciated! Thanks

推荐答案

有一个 DataSnapshot.forEach() 方法 正是为了这个目的:

There is a DataSnapshot.forEach() method precisely for this purpose:

firebase.database().ref('interests').child("I would like to dine with").on('value', (snapshot) => {
  snapshot.forEach((child) => {
    console.log(child.key, child.val()); 
    this.intVal.push(child.val());
    console.log("intVal",this.intVal);
  });
  }
})

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