laravel迁移时将默认设置为NULL [英] Set default to NULL with laravel migration

问题描述

我要在迁移中的表中添加一个字段，希望允许它为NULL，但我也希望它默认为NULL.我应该在默认方法中放置什么?我担心放入"NULL" 会尝试放置一串 NULL ，而我显然不希望这样做.请帮忙:)

I am adding a field to a table in a migration that I wish to allow to be NULL but also I wish for it to default to NULL. What do I place in the default method? I fear that putting "NULL" in will attempt to place a string of NULLin which I obviously don't want. Please help :)

Schema::table('item_categories', function(Blueprint $table)
{
    $table->integer('parent_item_category_id')->unsigned()->nullable()->default($what_to_put here);
});

推荐答案

在字段上使用 nullable()方法时，该字段默认为NULL.

When you use the nullable() method on a field, that field will default to NULL.

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