[英]Cannot add foreign key constraint in laravel error
I have a migration for my tags table like the below: 我的标签表如下所示进行了迁移:
Schema::create('tags', function (Blueprint $table) {
$table->increments('id');
$table->char('tag' , 15);
});
Now, I have the following migration for my admin
table in which i have a foreign key associated with my tags
table , the migration is the following: 现在,我对admin
表进行了以下迁移,其中我有一个与我的tags
表相关联的外键,迁移如下:
Schema::create('admin', function (Blueprint $table) {
$table->char('tag' , 15);
$table->foreign('tag')->references('tag')->on('tags');
});
Now when i run this migration i get the following error: 现在,当我运行此迁移时,出现以下错误:
Both the tables are innodb
i have changed this in the settings in laravel. 两个表都是innodb
我在laravel中的设置中更改了此设置。 But i still get a cannot add a foreign key constraint error. 但是我仍然得到一个无法添加外键约束错误的信息。 Why ?? 为什么??
Try 尝试
$table->foreign('tag')->references('id')->on('tags');
Because in tags
table, the primary key is id
. 因为在tags
表中,主键是id
。
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