firefly-iii/app/models/LimitRepetition.php

<?php

use Watson\Validating\ValidatingTrait;
use \Illuminate\Database\Eloquent\Model as Eloquent;
/**
 * Class LimitRepetition
 */
class LimitRepetition extends Eloquent
{
    use ValidatingTrait;
    public static $rules
        = [
            'budget_limit_id' => 'required|exists:budgetlimits,id',
            'startdate'      => 'required|date',
            'enddate'        => 'required|date',
            'amount'         => 'numeric|required|min:0.01',
        ];

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

    /**
     * @return array
     */
    public function getDates()
    {
        return ['created_at', 'updated_at', 'startdate', 'enddate'];
    }

    /**
     *
     * @return float
     */
    public function spentInRepetition()
    {
        $sum = \DB::table('transactions')
            ->leftJoin('transaction_journals', 'transaction_journals.id', '=', 'transactions.transaction_journal_id')
            ->leftJoin('budget_transaction_journal', 'budget_transaction_journal.transaction_journal_id', '=', 'transaction_journals.id')
            ->leftJoin('budget_limits', 'budget_limits.budget_id', '=', 'budget_transaction_journal.budget_id')
            ->leftJoin('limit_repetitions', 'limit_repetitions.budget_limit_id', '=', 'budget_limits.id')
            ->where('transaction_journals.date', '>=', $this->startdate->format('Y-m-d'))
            ->where('transaction_journals.date', '<=', $this->enddate->format('Y-m-d'))
            ->where('transactions.amount', '>', 0)
            ->where('limit_repetitions.id', '=', $this->id)
            ->sum('transactions.amount');

        return floatval($sum);
    }
}