Laravel：如何使用日期时间字段按日期对集合进行分组？答案

【问题标题】：Laravel : How to to group collection by date with datetime field?Laravel：如何使用日期时间字段按日期对集合进行分组？
【发布时间】：2021-02-01 20:02:31
【问题描述】：

我有这个模型（匹配）：

[
  {
    "id": 2,
    "match_date": "2021-06-12 16:00:00",
    "home": "Wales",
    "away": "Switzerland",
    "h_goals": 0,
    "a_goals": 0
  },
  {
    "id": 3,
    "match_date": "2021-06-12 19:00:00",
    "home": "Denmark",
    "away": "Finland",
    "h_goals": 0,
    "a_goals": 0
  }
]

我如何按 match_date 对它们进行分组，但只是没有日期时间的日期格式，日期输出也只是时间，像这样：-

[
 "date" : "2021-06-12",
  "data" :[
  {
    "id": 2,
    "m_date": "16:00:00",
    "home": "Wales",
    "away": "Switzerland",
    "h_goals": 0,
    "a_goals": 0
  },
  {
    "id": 3,
    "m_date": "19:00:00",
    "home": "Denmark",
    "away": "Finland",
    "h_goals": 0,
    "a_goals": 0
  }]
]

【问题讨论】：

标签： laravel date datetime group-by

【解决方案1】：

使用 laravel 收集辅助方法，您可以将数据转换为

$collection = collect([
    [
        "id"=> 2,
        "match_date"=>"2021-06-12 16:00:00",
        "home"=> "Wales",
        "away"=>"Switzerland",
        "h_goals"=> 0,
        "a_goals"=> 0
    ],
    [
        "id"=> 3,
        "match_date"=> "2021-06-12 19:00:00",
        "home"=> "Denmark",
        "away"=> "Finland",
        "h_goals"=> 0,
        "a_goals"=> 0
    ]
]);

$results = $collection->map(function ($item, $key) {
    $item["m_date"] =  \Carbon\Carbon::parse($item["match_date"])->format("H:i:s");
    return $item;
})->groupBy(function ($item, $key) {
    return \Carbon\Carbon::parse($item["match_date"])->format("Y-m-d");
})->map(function ($item, $key) {
    return ["date"=> $key, "data"=> $item];
})->values();

【讨论】：