Unrecognized expression '$last'

[dpapala]

Hi,
i'm using this query
models_types::orderby('manufacturer_name')->groupby('manufacturer_name')->pluck('manufacturer_name','_id');
so that to get an array with these 2 fields. If i remove the groupby works fine but with it i get the error Unrecognized expression '$last'
With this query i want to retrieve distinct values of manufacturer_name in a collection that i have many documents with many manufacturers.
The issue comes up if i want to retrieve the object id.

I use
Laravel 6.2
PHP 7.3
MongoDB 4.2

[Smolevich]

@dpapala, show example for document models_types

[dpapala]

@Smolevich Here is an example of a document
{"_id":"5dce720d624700008e000680","code":"123456","manufacturer_id":"43","manufacturer_name":"ABARTH","model_name":"500","type1":"500 1.4i 16v T-Jet","type2":"","doors":"3","seats":"5","begindate":"2008-07-01","enddate":"2012-12-01","chassistype":"Χάτσμπακ","cc":"1368","engine_power_kw":"99","engine_power_hp":"135","tax_hp":"10","co2_emission":"155","created_at":"2019-02-08T08:03:22.000Z","updated_at":"2019-11-15T12:19:18.000Z","assignments":{"1":"ABAR","2":"ABARTH","3":"43","5":"","6":"839","7":"43","34":"43"}}

[sbourdette]

same issue

$matched = Face::select('_id', 'name','status')->where("status", "Matched")->groupBy('name')->count();
Exemple of document :

{
    "_id" : ObjectId("6064f87d529b985ca612fcd3"),
    "name" : "Match_1617302724.4186473",
    "status" : "Matched",
    "location" : {
        "top" : 395,
        "bottom" : 470,
        "right" : 2170,
        "left" : 2095,
        "y" : 380,
        "width" : 75,
        "height" : 75
    },
    "encodings" : [ 
        -0.055271852761507, 
        0.122758761048317, 
        0.0695331767201424, 
        -0.112777456641197, 
        -0.142022922635078, 
        0.0292802043259144, 
        -0.00932658649981022, 
        -0.0829119309782982, 
        0.124038711190224, 
        -0.031645193696022, 
        0.281644582748413, 
        -0.0900372341275215, 
        -0.34865391254425, 
        -0.0530666373670101, 
        0.0392620116472244, 
        0.108178436756134, 
        -0.206843748688698, 
        -0.0901616513729095, 
        -0.0443461611866951, 
        -0.0569641664624214, 
        0.0122841419652104, 
        0.0893829092383385, 
        -0.026526216417551, 
        0.0317213647067547, 
        -0.094365619122982, 
        -0.39166533946991, 
        -0.0689378827810287, 
        -0.0751822292804718, 
        0.0771296545863152, 
        -0.145128697156906, 
        0.0555307380855083, 
        0.0803900063037872, 
        -0.163985580205917, 
        -0.0487529784440994, 
        0.00694756489247084, 
        0.0370412841439247, 
        -0.0876236110925674, 
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        0.190512463450432, 
        0.0401624888181686, 
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        0.282071888446808, 
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        -0.0904222726821899, 
        0.125584095716476, 
        -0.289161592721939, 
        0.0850858688354492, 
        0.172501027584076, 
        0.166233614087105, 
        0.0232401862740517, 
        0.0906986221671104, 
        -0.213029742240906, 
        -0.00357053987681866, 
        0.132295086979866, 
        -0.262838542461395, 
        0.120987378060818, 
        0.0903061255812645, 
        -0.079695351421833, 
        -0.0271913316100836, 
        -0.116545170545578, 
        0.200792267918587, 
        0.0645279511809349, 
        -0.117638789117336, 
        -0.0925739705562592, 
        0.185062259435654, 
        -0.043363094329834, 
        -0.0679896026849747, 
        0.0801887512207031, 
        -0.112784013152122, 
        -0.200504943728447, 
        -0.264760434627533, 
        0.0939658433198929, 
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        0.108703397214413, 
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        0.00230949907563627, 
        0.079352542757988, 
        -0.0881452932953835, 
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        -0.0974472239613533, 
        0.0873661711812019, 
        0.116291873157024, 
        -0.0543152093887329, 
        -0.00118218874558806, 
        0.298654109239578, 
        -0.00548255071043968, 
        0.0629594251513481, 
        0.0280847661197186, 
        0.0471175499260426, 
        -0.121787346899509, 
        0.000528912525624037, 
        -0.0740763694047928, 
        0.00764632364735007, 
        0.133864685893059, 
        -0.135708674788475, 
        0.0108713991940022, 
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        0.214066743850708, 
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        -0.0281765647232533, 
        0.0358512736856937, 
        -0.0838737860321999, 
        -0.032456748187542, 
        0.0188745819032192, 
        0.209291011095047, 
        -0.327877640724182, 
        0.224193066358566, 
        0.153211772441864, 
        0.0193703528493643, 
        0.158673822879791, 
        0.018665786832571, 
        0.0289552919566631, 
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        0.0668149366974831, 
        -0.0541879758238792, 
        -0.0377741195261478, 
        0.0444448105990887
    ],
    "stats" : {},
    "picture_id" : ObjectId("605db03bb1395415a27860f2")
}

Laravel 5.6
PHP 7.4
MongoDB 4.4