php - 在Laravel 5中将“dateTime”列拆分为单独的“date”和“time”列

我有一个名为'offers'的表，其中有一个名为start_date的列，类型为dateTime。
我要将此列拆分为两个单独的列，称为：
start_date类型
date类型
为此，我有以下代码：

<?php

use App\Offer;
use Carbon\Carbon;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class FixOffersTable extends Migration
{
    public function up()
    {
        Schema::table('offers', function(Blueprint $table)
        {
            $table->renameColumn('start_date', 'start_date_time');
            $table->renameColumn('end_date', 'end_date_time');
        });

        Schema::table('offers', function (Blueprint $table)
        {
            $table->date('start_date')->after('start_date_time')->nullable();
            $table->time('start_time')->after('start_date')->nullable();

            foreach (Offer::all() as $offer) {
                /* Cannot use model mutator, as model class can change over time, and may no longer have certain columns
                in the $casts attribute. Therefore using the raw string fetched from the MySQL database. */
                $startDateTime = Carbon::createFromFormat('Y-m-d H:i:s', $offer->getOriginal('start_date_time'));
                $offer->start_date = Carbon::createFromDate($startDateTime->year, $startDateTime->month, $startDateTime->day);
                $offer->start_time = Carbon::createFromTime($startDateTime->hour, $startDateTime->minute, $startDateTime->second);
                $offer->save();
            }
        });
    }
}

但是，上面给出了以下错误：

[Doctrine\DBAL\Schema\SchemaException]
There is no column with name 'start_date' on table 'offers'.

然而，注释“for循环”意味着这个错误不再存在，这意味着问题就在某个地方。
更好的方法也欢迎！

最佳答案

回答了我自己的问题。我犯这个错误的原因有两个。
理由1，我要求一列在另一列之后，当它还不存在的时候。
原因2，我正在使用尚未创建的列创建offers。
应该这样做：

<?php

use App\Offer;
use App\Schedule;
use Carbon\Carbon;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class FixOffersTable extends Migration
{
    public function up()
    {
        DB::beginTransaction();

        Schema::table('offers', function(Blueprint $table)
        {
            $table->renameColumn('start_date', 'start_date_time');
            $table->renameColumn('end_date', 'end_date_time');
        });

        Schema::table('offers', function (Blueprint $table)
        {
            $table->time('start_time')->after('start_date_time')->nullable();
            $table->date('start_date')->after('start_date_time')->nullable();
        });


        foreach (Offer::all() as $offer) {
           /* Cannot use model mutator, as model class can change over time, and may no longer have certain columns
            in the $casts attribute. Therefore using the raw string fetched from the MySQL database. */
            $startDateTime = Carbon::createFromFormat('Y-m-d H:i:s', $offer->getOriginal('start_date_time'));
            $offer->start_date = Carbon::createFromDate($startDateTime->year, $startDateTime->month, $startDateTime->day);
            $offer->start_time = Carbon::createFromTime($startDateTime->hour, $startDateTime->minute, $startDateTime->second);
            $offer->save();
        }


        DB::commit();
    }
}

关于php - 在Laravel 5中将“dateTime”列拆分为单独的“date”和“time”列，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/41934852/