Question

我有这段代码：

if ($response && $response->getStatusCode() == 200) {
        $this->ticker = collect(collect(json_decode($response->getBody()->getContents(), true))->get('payload'));

        Log::info(json_encode($this->ticker));

        switch ($book):
            case 'btc_mxn':
                return $this->ticker->whereStrict('book', 'btc_mxn');
            case 'eth_mxn':
                return $this->ticker->whereStrict('book', 'eth_mxn');
            case 'all':    
                return $this->ticker;
            default:
                throw new ValidationHttpException(['Invalid book (9002)']);
        endswitch;
    }

$ response部分并不重要，只有$ this-＆gt;自动收报机部分。这将获得包含对象数组的API响应。 这些对象包含我关心的书籍领域。 json看起来像这样：

[{"high":"59999.00","last":"53021.11","created_at":"2017-05-25T23:16:44+00:00","book":"btc_mxn","volume":"1313.28966742","vwap":"55354.76622471","low":"50000.00","ask":"53998.92","bid":"53021.11"},{"high":"4699.00","last":"4102.00","created_at":"2017-05-25T23:16:44+00:00","book":"eth_mxn","volume":"7162.16835199","vwap":"4322.60134630","low":"3900.00","ask":"4102.00","bid":"4100.00"},{"high":"0.00012498","last":"0.00010700","created_at":"2017-05-25T23:16:44+00:00","book":"xrp_btc","volume":"17584.07258163","vwap":"0.00010897","low":"0.00009500","ask":"0.00011990","bid":"0.00010100"},{"high":"7.10","last":"6.05","created_at":"2017-05-25T23:16:44+00:00","book":"xrp_mxn","volume":"1015137.88406527","vwap":"6.28004670","low":"5.50","ask":"6.05","bid":"5.85"},{"high":"0.08197000","last":"0.07800000","created_at":"2017-05-25T23:16:44+00:00","book":"eth_btc","volume":"73.29999906","vwap":"0.07656212","low":"0.07250000","ask":"0.07800000","bid":"0.07600000"}]

当我切换$ book时会出现问题。如果$ book ='btc_mxn'我得到一个对象数组：

[
  {
    "high": "59999.00",
    "last": "53000.00",
    "created_at": "2017-05-25T23:23:29+00:00",
    "book": "btc_mxn",
    "volume": "1316.43950673",
    "vwap": "55323.60047189",
    "low": "50000.00",
    "ask": "53000.00",
    "bid": "52001.00"
  }
]

但是，如果$ book ='eth_mxn'我会得到一个对象！

{
  "1": {
    "high": "4699.00",
    "last": "4025.97",
    "created_at": "2017-05-25T23:24:18+00:00",
    "book": "eth_mxn",
    "volume": "7360.11920724",
    "vwap": "4310.48584845",
    "low": "3900.00",
    "ask": "4026.00",
    "bid": "4000.01"
  }
}

对于任何其他不是'btc_mxn'的书键，情况也是如此。

我通过添加对first（）方法的调用来解决此问题，但这很奇怪。有人知道这里发生了什么事吗？

感谢。

Answer 1

预订“btc_mxn”是集合中的第一本书，其索引为0.因此，您的where结果如下所示：

[
    0 => { /* book data */ }
]

在json中，这是一个正确的数字索引数组，因此它表示为一个包含一个元素的数组。

但是，书籍“eth_mxn”是集合中的第二本书，其索引为1.因此，您的where结果如下所示：

[
    1 => { /* book data */ }
]

在json中，这不是一个正确的数字索引数组，因为索引数组必须有从索引0开始的顺序键。由于这不是一个有效的json数组，它表示为一个对象，其中数字键是属性对象

如果您希望将其表示为数组，则需要从where()调用中重新生成结果集合。您可以使用values()方法重新生成结果：

case 'btc_mxn':
    return $this->ticker->whereStrict('book', 'btc_mxn')->values();
case 'eth_mxn':
    return $this->ticker->whereStrict('book', 'eth_mxn')->values();

问题与Laravel 5.4中的收集方法有关

1 个答案: