firefly-iii/app/Models/AccountMeta.php

<?php namespace FireflyIII\Models;

use Illuminate\Database\Eloquent\Model;

class AccountMeta extends Model
{

    public function account()
    {
        return $this->belongsTo('Account');
    }


    public function getDataAttribute($value)
    {
        return json_decode($value);
    }

    public function setDataAttribute($value)
    {
        $this->attributes['data'] = json_encode($value);
    }

}