未定义的属性：stdClass :: $ jumlah

Question

I've joined 2 tables (detail_pemesanan and pemesanan) and I want to do some operation with data from detail_pemesanan table, but it doesn't work

This is the join query

    $data = DB::table('detail_pemesanan')
        ->join('pemesanan', 'detail_pemesanan.id_pemesanan', '=', 'pemesanan.id_pemesanan')
        ->select('pemesanan.tgl_pesan', DB::raw('SUM(detail_pemesanan.jumlah)'))
        ->groupBy('pemesanan.tgl_pesan')
        ->get();

And this is my operation

        for ($i = 0; $i < 6; $i++) {
        if ($i == 0) {
            $st[$i] = $data[$i]->jumlah;
            $bt[$i] = $data[$i + 1]->jumlah - $data[$i]->jumlah;
            $ftm[$i] = null;
            $pe[$i] = null;
        } else {
            $st[$i] = $alpha * $data[$i]->jumlah + (1 - $alpha) * ($st[$i - 1] + $bt[$i - 1]);
            $bt[$i] = $gamma * ($st[$i] - $st[$i - 1]) + (1 - $gamma) * $bt[$i - 1];
            $ftm[$i] = ($st[$i - 1] + $bt[$i - 1]) * 1;
            $pe[$i] = (($data[$i]->jumlah - $ftm[$i]) / $data[$i]->jumlah) * 100;
        }
        if ($pe[$i] < 0) {
            $pe[$i] = abs($pe[$i]);
        }
    }

Any solution? Thanks

Answer 1

Maybe it isn't fetching jumlah column

You may try changing your select clause to this

->select('pemesanan.tgl_pesan', DB::raw('SUM(detail_pemesanan.jumlah) as jumlah'))