Laravel migration self referencing foreign key issue

You have to break this into two Schema blocks, one creating the columns, the other adding the FKs. mysql can't do both at the same time.

Two querys work :

Schema::create('cb_category', function($table)
{
    $table->integer('id')->primary()->unique()->unsigned();
    $table->integer('parent_id')->nullable();  
});

Schema::table('cb_category', function (Blueprint $table) 
{
    $table->foreign('parent_id')->references('id')->on('cb_category')->onUpdate('cascade')->onDelete('cascade');
});