Question

我有以下Firebase JSON数据结构;

  {
  "USERS": {
    "YjGJsvCb58OsTThv6JLmK1dMuHr1": {
      "Email": "test@test.com"
    },
    "zQpb7o18VzYsSoTQtT9DNhOqTUn2": {
      "Email": "test2@test.com"
    }
  },
  "POSTS": {
    "-KSe4eJyenccPoC5T0zP": {
      "addedByUser": "YjGJsvCb58OsTThv6JLmK1dMuHr1",
      "content": "Post 1",
      "cost": "600",
      "duration": "Quarterly",
      "latitude": "51.5099850000001",
      "longitude": "-0.133528614416432",
      "timestamp": "Tue 27 Sep"
    },
    "-KSe4q1DXoulArzWm_Zm": {
      "addedByUser": "YjGJsvCb58OsTThv6JLmK1dMuHr1",
      "content": "Post 2",
      "cost": "550",
      "duration": "Monthly",
      "latitude": "51.5100199999855",
      "longitude": "-0.133507191218496",
      "timestamp": "Tue 27 Sep"
    }
  }
}

我想过滤POSTS并获取POSTS作为duration或用户选择的所有Monthly。如您所见，每个POST都分配了AutoID。

我要找的结果应吐出来：

  {
  "-KSe4q1DXoulArzWm_Zm": {
    "addedByUser": "YjGJsvCb58OsTThv6JLmK1dMuHr1",
    "content": "Post 2",
    "cost": "550",
    "duration": "Monthly",
    "latitude": "51.5100199999855",
    "longitude": "-0.133507191218496",
    "timestamp": "Tue 27 Sep"
  }
}

但是，对于我的生活，我不能搜索AutoID。我已经尽力了queryFor＆amp; observe方法。我搜索了StackOverflow，似乎没有解决方案。我是否正确构建了数据？我需要AutoID的原因是某些帖子可能是相同的。

非常感谢任何帮助。

Answer 1

试试这个： -

FIRDatabase.database().reference().queryOrdered(byChild: "POSTS").queryEqual(toValue: "monthly").observeSingleEvent(of: .value, with: {(snap) in


    if let postsDict = snap.value as! [String:AnyObject]{

       for each in postsDict {

          print(each)

            }

    }else{

    //That username doesnt exists.

    }

})

Firebase数据过滤

1 个答案: