Laravel 使用软删除数据进行唯一验证

Question

I want to use Laravel Unique validator with the implementation of softdeletes. I've been try many times but it produce an error like this. What should i do? Thanks in advance. Here's my code example.

 public function store(Request $request)
{
    $request->validate([
        'nama' => 'required',
        'nim' => [
            'required',
            'size:10',
            Rule::unique('students')->where(function ($query) {
                return $query->where('deleted_at', NULL);
            })
        ],
        'email' => 'required|email',
    ]);

    Student::create([
        'major_id' => $request->major_id,
        'nama' => $request->nama,
        'slug' => Str::of($request->nama)->slug('-'),
        'nim' => $request->nim,
        'email' => $request->email,
    ]);
    return redirect('/students')->with('status', 'Success');
}

Answer 1

The error you're getting is from a constraint in your database. Nothing you can do in the code can counter that. The database doesnt care for soft delete.

You need to remove the constraint from the database first, then use your solution or the one from this post check-if-name-is-unique-among-non-deleted-items-with-laravel-validation

To remove the constraint, run this query

ALTER TABLE students DROP CONSTRAINT students_nim_unique;

The best practice would be to create a new migration running this query. Carefull for the down() method, you will not be able to put back the constraint if there are dupplicate nim in the table (soft deleted or not)