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<?php

class PostsMigration extends Migration

    public function up()
    {
        Schema::table('posts', function (Blueprint $table) {
            $table->json('show_in')->nullable();
        });
    }
}

<?php

class Post extends Model
{
    //cast to json when storing, and array when retrieving
    
    protected $casts = [
        'show_in' => 'array',
    ];
    
    //set default value for json column array

    protected $attributes = [
        'show_in' => '["sidebar_left", "sidebar_right", "content", "top"]'
    ];
    
    //set default value for json column object
    
    protected $attributes = array(
        'show_in' => '{}'
    );
    
}