Related content

You know that in Laravel we can delete records with foreign keys by creating on delete cascade features. Laravel 9 releases a new feature called noActionOnDelete. This noActionOnDelete helps you to generate your foreign key constraint but it can not delete your relational data like on delete cascade.

Yes, now Laravel has a foreign key without a constraint. We can now define laravel foreign key constraints without cascade. Look at that, the below example is with cascade with foreign key constraints.

laravel-9-foreign-key-define-without-cascade

The example of laravel delete record with foreign key:

<?php

public function up()
{
    Schema::create('posts', function (Blueprint $table) {
        $table->id();
        $table->foreignIdFor(User::class)
            ->constrained()
            ->cascadeOnUpdate()
            ->cascadeOnDelete();
        $table->mediumText('title')->unique();
        $table->integer('post_views')->default(0);
        $table->boolean('is_published')->default(true);
        $table->timestamps();
    });
}

 

Now see the example of noActionOnDelete in Laravel:

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('posts', function (Blueprint $table) {
            $table->id();
            $table
                ->foreign('user_id')
                ->references('id')
                ->on('users')
                ->noActionOnDelete();
            $table->mediumText('title')->unique();
            $table->integer('post_views')->default(0);
            $table->boolean('is_published')->default(true);
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('posts');
    }
};

 

Read also: Read CSV File And Database Seeder Example In Laravel

 

Conclusion

I have tried to discuss the clear concept of can you have a foreign key without a constraint. Now we know laravel foreign key constraint without cascade. Hope this noActionOnDelete Laravel tutorial will help you.