Activity.php

<?php namespace Acme\Plugin\Models;

use Model;

class Activity extends Model
{

    public $table = 'acme_activity';

    public $hasMany = [
        'prices' => 'Acme\Plugin\Models\Price'
    ];


    public $attachOne = [
        'image'=>['System\Models\File']
    ];
}

migrations.php

<?php
// activity
Schema::create('acme_activity', function ($table) {
  $table->increments('id');
  
  $table->string('name');
  $table->string('slug');
  $table->string('tagline');
  $table->text('description');

  $table->boolean('is_published')->default(true);

  $table->timestamps();
});

// price
Schema::create('vannut_price', function ($table) {
  $table->increments('id');

  $table->integer('activity_id');
  $table->string('description');
  $table->integer('cents');

  $table->boolean('available')->default(true);

  $table->timestamps();
});

Price.php

<?php namespace Acme\Plugin\Models;

use Model;

class Price extends Model
{

    public $table = 'acme_price';

    public $belongsto = [
        'activity' => 'Acme\Plugin\Models\Activity'
    ];

}