references laravel 8 migration code example
Example 1: laravel foreign key
Schema::table('posts', function (Blueprint $table) {
$table->unsignedBigInteger('user_id');
$table->foreign('user_id')->references('id')->on('users');
});
OR
Schema::table('posts', function (Blueprint $table) {
$table->foreignId('user_id')->constrained();
});
Example 2: migrate to an existing table in laravel commad
public function up()
{
Schema::table('users', function($table) {
$table->integer('paid');
});
}