Laravel migration (errno: 150 "Foreign key constraint is incorrectly formed")

the foreign key must be an "unsignedBigInteger" and it will be fixed, something like this:

$table->unsignedBigInteger('user_id');

$table->foreign('user_id')->references('id')->on('users');

Since increments() creates an unsigned integer column, you need to define the foreign key column as unsigned integer too.

Default migrations in Laravel 6+ use bigIncrements(), so you need to use unsignedBigInteger() method:

$table->unsignedBigInteger('order_id');

https://laravel.com/docs/6.x/migrations#foreign-key-constraints

For default migrations in older versions of Laravel use unsignedInteger() method:

$table->unsignedInteger('order_id');

Or:

$table->integer('order_id')->unsigned();

https://laravel.com/docs/5.5/migrations#foreign-key-constraints

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