firefly-iii/app/models/Account.php

<?php
use LaravelBook\Ardent\Ardent as Ardent;
use LaravelBook\Ardent\Builder;

/**
 * Account
 *
 * @property integer $id
 * @property \Carbon\Carbon $created_at
 * @property \Carbon\Carbon $updated_at
 * @property integer $user_id
 * @property integer $account_type_id
 * @property string $name
 * @property boolean $active
 * @property-read \AccountType $accountType
 * @property-read \Illuminate\Database\Eloquent\Collection|\Transaction[] $transactions
 * @property-read \Illuminate\Database\Eloquent\Collection|\Piggybank[] $piggybanks
 * @property-read \User $user
 * @method static \Illuminate\Database\Query\Builder|\Account whereId($value)
 * @method static \Illuminate\Database\Query\Builder|\Account whereCreatedAt($value)
 * @method static \Illuminate\Database\Query\Builder|\Account whereUpdatedAt($value)
 * @method static \Illuminate\Database\Query\Builder|\Account whereUserId($value)
 * @method static \Illuminate\Database\Query\Builder|\Account whereAccountTypeId($value)
 * @method static \Illuminate\Database\Query\Builder|\Account whereName($value)
 * @method static \Illuminate\Database\Query\Builder|\Account whereActive($value)
 * @method static \Account accountTypeIn($types)
 */
class Account extends Ardent
{

    /**
     * Validation rules.
     *
     * @var array
     */
    public static $rules
        = [
            'name'            => ['required', 'between:1,100', 'alphabasic'],
            'user_id'         => 'required|exists:users,id',
            'account_type_id' => 'required|exists:account_types,id',
            'active'          => 'required|boolean'

        ];

    /**
     * Account type.
     *
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function accountType()
    {
        return $this->belongsTo('AccountType');
    }

    /**
     * Get an accounts current balance.
     *
     * @param \Carbon\Carbon $date
     *
     * @return float
     */
    public function balance(\Carbon\Carbon $date = null)
    {
        $date = is_null($date) ? new \Carbon\Carbon : $date;

        return floatval(
            $this->transactions()
                 ->leftJoin(
                 'transaction_journals', 'transaction_journals.id', '=', 'transactions.transaction_journal_id'
                )
                 ->where('transaction_journals.date', '<=', $date->format('Y-m-d'))->sum('transactions.amount')
        );
    }

    public function balanceBeforeJournal(TransactionJournal $journal)
    {
        return floatval(
            $this->transactions()
                ->leftJoin(
                    'transaction_journals', 'transaction_journals.id', '=', 'transactions.transaction_journal_id'
                )
                ->where('transaction_journals.date', '<=', $journal->date->format('Y-m-d'))
                ->where('transaction_journals.created_at', '<=', $journal->created_at->format('Y-m-d H:i:s'))
                ->where('transaction_journals.id','!=',$journal->id)
                ->sum('transactions.amount')
        );
    }

    /**
     * Transactions.
     *
     * @return \Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function transactions()
    {
        return $this->hasMany('Transaction');
    }

    /**
     * @return \Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function piggybanks()
    {
        return $this->hasMany('Piggybank');
    }

    /**
     * @param \Carbon\Carbon $date
     *
     * @return null
     */
    public function predict(
        /** @noinspection PhpUnusedParameterInspection */
        \Carbon\Carbon $date
    )
    {
        return null;
    }

    /**
     * User
     *
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function user()
    {
        return $this->belongsTo('User');
    }

    public function scopeAccountTypeIn(Builder $query, array $types) {
        if(is_null($this->joinedAccountTypes)) {
            $query->leftJoin('account_types','account_types.id','=','accounts.account_type_id');
            $this->joinedAccountTypes = true;
        }
        $query->whereIn('account_types.type',$types);
    }


}