Laravel eloquent using distinct() with wherein()?

In Laravel is it possible that we should use distinct() with wherein()?

$patients = Patient::whereIn('id', [1, 2, 3, 5, 6, 9])->get();

$groupby_patients = $patients->groupBy('gender');

In the $patients query, the distinct() is not working with whereIn() and I want to use distinct() in my query(), I do not want to get all-male patients and I want to select just one in the male group or just one in the female group like the example given below.

Example:

IlluminateSupportCollection {#2319 ▼
    #items: array:2 [
        male,
        female
    ]
}

Any help would be appreciated.

Answers:

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Method 1

2 rows are considered distinct if none of the columns match in the columns selected.

For example, if we had the following patients:

And we did:

Patient::select('name', 'gender')->distinct()->get();

We would get:

Therefore it does not seem to be suitable for your use case.

This would be an efficient way of performing your query:

$genders = ['male', 'female'];

// $genders = Patient::select('gender')->distinct(); // If you want to dynamically fetch the genders.

$patients = collect();
foreach($genders as $gender) {
    $patient = Patient::whereIn('id', [1, 2, 3, 5, 6, 9])->where('gender', $gender)->first();
    if ($patient !== null) {
        $patients->push($patient);
    }
}

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