how to add foreign constraints in migtrations larvel 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: add column in laravel migration

php artisan make:migration add_paid_to_users_table --table=users

Example 3: migrate to an existing table in laravel commad

public function up()
{
    Schema::table('users', function($table) {
        $table->integer('paid');
    });
}

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