I tried filtering data based on the 'Jadwal_kuliah' and 'khs' tables but I found an error "The object of the class stdClass could not be converted to string" :

function jadwal_kuliah_json()
    $nim = Auth::guard('mahasiswa')->user()->nim;

    $tahun_akademik = \DB::table('tahun_akademik')->where('status', 'y')->first();

    $kelas = \DB::table('khs')
        ->where('nim', $nim)

    $jadwal = \DB::table('jadwal_kuliah')
        ->join('khs', 'jadwal_kuliah.kode_mk', '=', 'khs.kode_mk')
        ->where('jadwal_kuliah.kode_kelas', $kelas)
        ->where('khs.nim', $nim)
        ->select('matakuliah.nama_mk', 'jadwal_kuliah.hari', 'jam_kuliah.jam', 'ruangan.nama_ruangan', 'dosen.nama', 'kelas.nama_kelas')

    return Datatables::of($jadwal)->make(true);


    "id": 36,
    "kode_kelas": "TI18A",
    "hari": "senin",
    "kode_mk": "TI001",
    "nidn": "15110185",
    "jam": "1",
    "kode_jurusan": "ifd3",
    "kode_ruangan": "LBKom",
    "kode_tahun_akademik": "20182",
    "semester": 1,
    "created_at": "2019-02-28 15:02:52",
    "updated_at": "2019-02-28 15:02:52"

What needs to be changed?

  • Can you share the full and exact error message, and the line causing it? – Nico Haase Apr 11 at 14:18
  • $kelas is an object, it must be changed to a string, but if the class is changed to first() then only 1 data is displayed – Khaiz Badaru Tammam Apr 11 at 14:35
  • Well, then "change" it to a string if you think that is the way to go. I'd recommend to use some kind of ID or whatever you store in the database to join these tables - but still, what's the problem in doing it? – Nico Haase Apr 11 at 14:53
  • I don't know what queries to use to filter data. if you use a condition where it must call one of the other conditions – Khaiz Badaru Tammam Apr 11 at 15:20
  • What do you mean by "call one of the other conditions"? Why not use a scalar value like an ID? As we don't know anything about the structure of your models and tables, it's hard to help – Nico Haase Apr 11 at 15:22

$kelas is a collection and you're passing it as a string condition in :


First return an object using first() like :

$kelas = \DB::table('khs')

Then you must get the property instead like :

  • how to change to string? – Khaiz Badaru Tammam Apr 11 at 14:18
  • 1
    Check my update – Zakaria Acharki Apr 11 at 14:19
  • I have tried and an error appears "Property [kode_kelas] does not exist on this collection instance." because $kelas must use first(). I tried first() but only display 1 data – Khaiz Badaru Tammam Apr 11 at 14:22
  • Yes, it will return one object, else if you want a collection then how you'll handle multiple kode_kelas in ->where('jadwal_kuliah.kode_kelas', multiple_kode_kelas ) ? – Zakaria Acharki Apr 11 at 14:23
  • what do you mean? Please show me for example? :D – Khaiz Badaru Tammam Apr 11 at 14:31

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