Laravel - 按星期几计算

Question

假设我有一个名为books数据库表：

+----+-----------+-------------+
| id | bookTitle | publishedOn |
+----+-----------+-------------+
| 1  | Red Rose  | 2019-09-21  |
+----+-----------+-------------+
| 2  | Dark Fury | 2019-09-22  |
+----+-----------+-------------+
| 3  | Morbid    | 2019-10-01  |
+----+-----------+-------------+
| 4  | Dark      | 2019-11-14  |
+----+-----------+-------------+
| 5  | Route A   | 2019-11-15  |
+----+-----------+-------------+

我将如何使用 Laravel 的 Eloquent 按一年中的一周进行分组，以便在第 45 周...我出版了 2 本书等等。

数据集将返回如下内容：

$weekCount = [
  '45' => 2,
  '46' => 1,
  '47' => 1,
  '48' => 2
];

Answer 1

使用 mysql WEEK(timestamp) ：

按周数和年份分组：

$weekCount = [];
Book::selectRaw('WEEK(publishedOn) AS publishedWeek, COUNT(id) AS booksCount')
    ->where(...)
    ->groupBy("publishedWeek")
    ->get()
    ->map('publishedWeek', function($item) use ($weekCount) {
        $weekCount[$item->publishedWeek] = $item->booksCount;
    });

按没有年份的周数分组：

$weekCount = [];
Book::selectRaw("CONCAT(YEAR(publishedOn), '/', WEEK(publishedOn)) AS publishedWeek, COUNT(id) AS booksCount")
    ->where(...)
    ->groupBy("publishedWeek")
    ->get()
    ->map('publishedWeek', function($item) use ($weekCount) {
        $weekCount[$item->publishedWeek] = $item->booksCount;
    });