Answers for "laravel use foreign key"

foreign key in laravel migration

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

laravel change foreign key name

//Note : Before Renaming Foreign, You Must Need To Delete Old Foreign And Assign New One
class RenameColumn extends Migration
{

    public function up()
    {
        Schema::table('holidays', function(Blueprint $table) {
            $table->dropForeign('holidays_account_id_foreign');
            $table->renameColumn('account_id ', 'engagement_id');

            $table->foreign('account_id')->references('id')->on('accounts')->onDelete('cascade');
        });
    }

    public function down()
    {
        Schema::table('holidays', function(Blueprint $table) {
            $table->dropForeign('holidays_engagement_id_foreign');
            $table->renameColumn('account_id ', 'engagement_id');

            $table->foreign('account_id')->references('id')->on('accounts')->onDelete('cascade');
        });
    }
}

add foreign key column laravel 5.8

update your `integer('user_id')` to `bigInteger('user_id')`
public function up() { 
        Schema::create('evaluation', function (Blueprint $table) { 
            $table->increments('id'); 
            $table->bigInteger('user_id')->unsigned()->index(); 
            $table->timestamps();
            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
        });
    }