Question

当我尝试将多个记录保存到数据库时，我收到此错误

未定义的偏移量：2

我的商店控制器

public function store(Request $request)
{
    $course = Course::create($request->all());

    $lessons = $request->except(['_token','_method']);
    for($x = 0;$x <= count($lessons); $x++)
    {
        $lesson = CourseClass::create([
            'course_id' => $course->id,
            'class_name' => $lessons['class_name'][$x],
            'class_desc' => $lessons['class_desc'][$x],
            'video' => $lessons['video'][$x],
            'files' => $lessons['files'][$x],
            'free' => $lessons['free'][$x],
        ]);
        $lesson->save();
    }
}

Answer 1

SELECT month,
       year,
       MAX(q_overall) -- assign the value to all rows within the same group
       OVER (PARTITION BY grp)
FROM
 (
    SELECT all_months.month, all_months.year, p.q_overall,
       -- assign a new group number whenever there's a value in q_overall
       SUM(CASE WHEN q_overall IS NULL THEN 0 ELSE 1 END) 
       OVER (ORDER BY all_months.month, all_months.year
             ROWS UNBOUNDED PRECEDING) AS grp
    FROM
     ( -- create all months with min and max date
       SELECT generate_series(date_trunc('month', min(date)),
                              date_trunc('month', max(date)),
                              interval '1 month') as date
       FROM fb_parsed 
     ) AS all_months
    LEFT JOIN 
     ( -- do the average per month calculation
       SELECT EXTRACT(Month FROM date) as month, 
              EXTRACT(Year FROM date) as year,
              ROUND(AVG(q_overall),1) as q_overall 
       FROM fb_parsed 
       WHERE business_id = 1
       GROUP BY year, month
     ) AS p
     ON EXTRACT(year FROM ym.date) = all_months.month
    AND EXTRACT(month FROM ym.date) = all_months.year
 ) AS dt

Answer 2

您的索引迭代器与您的使用不兼容。您正在获取请求参数的计数，并尝试使用它来访问每个参数的数组值。

$request->except(['_token','_method'])

可能会返回类似的内容：

[
  'class_name' => ['namea', 'nameb'],
  'class_desc' => ['desca', 'descb'],
  'video' => ['vida', 'vidb'],
  'files' => ['filesa', 'filesb'],
  'free' => [true, false],
]

因此，count($lessons)将返回（假装我的示例完全准确）5。而您可能正在寻找2（子阵列的大小）。

您可以像@tech建议那样做，并从其中一个子数组中获取计数以供您编制索引：

count($lessons['class_name'])

Answer 3

尝试一下

public function store(Request $request)
{
    $course = Course::create($request->all());

    $lessons = $request->except(['_token','_method']);
    for($x = 0;$x <= count($lessons); $x++)
    {
        $lesson = CourseClass::create([
            'course_id' => $course->id,
            'class_name' => $lessons[$x]['class_name'],
            'class_desc' => $lessons[$x]['class_desc'],
            'video' => $lessons[$x]['video'],
            'files' => $lessons[$x]['files'],
            'free' => $lessons[$x]['free'],
        ]);
        $lesson->save();
    }
}

我希望它会有所帮助：）

未定义的偏移量：laravel中的2

3 个答案: