如何根据查询结果中的字段创建分组结构

Question

我正在尝试在cakeph3中按年份分组。我可以使用以下方式，但它仍然没有按年份分组（我想要的方式。）

$query = $this->Alerts->query();
$year = $query->func()->year([
    'added_on' => 'literal'
]);
$month = $query->func()->monthname(['added_on' => 'literal']);
$monthAlertsCount = $query->func()->count($month);
$data = $query
    ->select([
        'year' => $year,
        'month' => $month,
        'count' => $monthAlertsCount
    ])
    ->group($year)
    ->group($month);
$status = "success";
$this->set('response', $status);
$this->set('year', $data);
$this->set('_serialize', ['response','year']);

电流输出如下：

{
    "response":"success",
    "year":[
        {
            "year":"2013",
            "month":"November",
            "count":"1"
        },
        {
            "year":"2014",
            "month":"February",
            "count":"2"
        },
        {
            "year":"2014",
            "month":"January",
            "count":"3"
        },
        {
            "year":"2015",
            "month":"December",
            "count":"6"
        },
        {
            "year":"2015",
            "month":"February",
            "count":"3"
        },
        {
            "year":"2015",
            "month":"January",
            "count":"4"
        },
        {
            "year":"2016",
            "month":"January",
            "count":"83"
        }
    ]
}

预期输出：

{
    "response":"success",
    "year":[
        {
            "2013":[
                {
                    "month":"November",
                    "count":"1"
                }
            ],
            "2014":[
                {
                    "month":"February",
                    "count":"2"
                },
                {
                    "month":"January",
                    "count":"3"
                }
            ],
            "2015":[
                {
                    "month":"December",
                    "count":"6"
                },
                {
                    "month":"February",
                    "count":"3"
                },
                {
                    "month":"January",
                    "count":"4"
                }
            ],
            "2016":[
                {
                    "month":"January",
                    "count":"83"
                }
            ]
        }
    ]
}

有人能帮我在cakepp3中得到预期的输出吗？

Answer 1

使用集合方法groupBy()-记住，查询是集合对象（有点）！

$data = $query
    ->select([
        'year' => $year,
        'month' => $month,
        'count' => $monthAlertsCount
    ])
    ->group($year)
    ->group($month)
    ->groupBy('year');

这将创建所需的分组结构，但不会从单个行中删除year字段，如果您希望删除它们，请使用映射器，如

// ...
->groupBy('year')
->map(function ($rows) {
    foreach ($rows as &$row) {
        unset($row['year']);
    }
    return $rows;
});

另请参见

• 食谱>收藏>收藏：：groupBy（）
• 食谱>收藏>收藏：：map（）
• 食谱>数据库访问&ORM>查询生成器>查询是集合对象