migration.php

<?php

public function up()
{
    Schema::create('categories', function (Blueprint $table){

        $table->increments('id'); 
        $table->string('slug')->nullable(); 
        $table->string('old_redirect')->nullable(); 
        $table->string('name')->nullable();
        $table->string('short_desc')->nullable(); 
        $table->text('full_desc')->nullable();
        $table->string('img_sm')->nullable(); 
        $table->string('img_md')->nullable();
        $table->string('img_lg')->nullable();
        $table->unsignedTinyInteger('priority');
        $table->unsignedTinyInteger('type');
        $table->boolean('active')->default(true);
        $table->timestamps();

        NestedSet::columns($table);

        $table->unique(['parent_id', 'slug']);

    });

}

public function down()
{
    Schema::table('categories', function (Blueprint $table) {
        NestedSet::dropColumns($table);
    });
    Schema::dropIfExists('categories');
}