firefly-iii/app/Models/TransactionType.php

<?php namespace FireflyIII\Models;

use Carbon\Carbon;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;

/**
 * FireflyIII\Models\TransactionType
 *
 * @property integer                              $id
 * @property Carbon                               $created_at
 * @property Carbon                               $updated_at
 * @property Carbon                               $deleted_at
 * @property string                               $type
 * @property-read Collection|TransactionJournal[] $transactionJournals
 */
class TransactionType extends Model
{
    use SoftDeletes;

    const WITHDRAWAL      = 'Withdrawal';
    const DEPOSIT         = 'Deposit';
    const TRANSFER        = 'Transfer';
    const OPENING_BALANCE = 'Opening balance';

    protected $dates = ['created_at', 'updated_at', 'deleted_at'];

    /**
     * @return bool
     */
    public function isDeposit()
    {
        return $this->type === TransactionType::DEPOSIT;
    }

    /**
     * @return bool
     */
    public function isOpeningBalance()
    {
        return $this->type === TransactionType::OPENING_BALANCE;
    }

    /**
     * @return bool
     */
    public function isTransfer()
    {
        return $this->type === TransactionType::TRANSFER;
    }

    /**
     * @return bool
     */
    public function isWithdrawal()
    {
        return $this->type === TransactionType::WITHDRAWAL;
    }

    /**
     * @return \Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function transactionJournals()
    {
        return $this->hasMany('FireflyIII\Models\TransactionJournal');
    }
}