这适用于创建/存储，但不适用于编辑/更新。我希望用户被更新，数据已经存在于数据库中，验证错误出现。像这样在用户存储中，我添加了数据，它工作，即使已经有相同的数据然后验证错误出现，但在不同的更新，如果我只更新地址，那么旧的用户名数据仍然使用，如果我改变用户名，它也工作，但它不't如果我用现有的用户名替换用户名，验证错误不会出现，而是显示以下错误。请帮助我，我仍然是一名学生!
错误：
数据库状态[23000]：完整性约束冲突：1062关键字'user_username_unique'的条目'asdf'重复（SQL：更新user设置username = asdf，password = $2y$10$BYdD到N5jCCuRLdZx70YA. BFgyVIWulL8n/bv5C3VxOVCw6WBN.kO，kota_id = 1505，kecamatan_id = 1505013，desa_id = 1505013004，user. updated_at = 2022年4月9日14：25：03，其中id = 4）
用户迁移：

Schema::create('user', function (Blueprint $table) {
    $table->bigIncrements('id');
    $table->string('nik')->unique()->nullable();
    $table->string('nama')->nullable();
    $table->string('telp')->unique()->nullable();
    $table->string('email')->unique();
    $table->timestamp('email_verified_at')->nullable();
    $table->string('foto')->nullable();
    $table->string('username')->unique();
    $table->string('password');
    $table->enum('level', ['user','admin'])->default('user');
    $table->unsignedBigInteger('provinsi_id')->nullable();
    $table->unsignedBigInteger('kota_id')->nullable();
    $table->unsignedBigInteger('kecamatan_id')->nullable();
    $table->unsignedBigInteger('desa_id')->nullable();
    $table->text('alamat')->nullable();
    $table->rememberToken();
    $table->timestamps();
});

用户控制器存储

public function store(Request $request)
{
    $validasi = $request->validate([
        'username' => ['required', 'string', 'min:3', 'max:30', 'unique:user'],
        'email' => ['required', 'email', 'string', 'max:255', 'unique:user'],
        'password' => ['required', 'string', 'min:8'],
        'nama' => ['required', 'string', 'min:3', 'max:50'],
        'nik' => ['required', 'string', 'min:16', 'max:16', 'unique:user'],
        'telp' => ['required', 'string', 'min:12', 'max:13', 'unique:user'],
        'provinsi_id' => ['required'],
        'kota_id' => ['required'],
        'kecamatan_id' => ['required'],
        'desa_id' => ['required'],
        'foto' => ['mimes:jpeg,jpg,png'],
        'level' => ['required'],
        'alamat' => ['required'],
        ]);
    $validasi['password'] = Hash::make('password');
    $create = User::create($validasi);
    if($request->hasFile('foto')){
        $request->file('foto')->move('images/',$request->file('foto')->getClientOriginalName());
        $create->foto = $request->file('foto')->getClientOriginalName();
        $create->save();
    }

    return redirect()->route('user.index');
}

用户控制器更新

public function update(Request $request, $id)
{
    $user = User::find($id);
    $validasi = $request->validate([
        'username' => ['required', 'string', 'min:3', 'max:30', 'unique:user,id'],
        'email' => ['required', 'email', 'string', 'max:255', 'unique:user,id'],
        'password' => ['required', 'string', 'min:8', 'max:20'],
        'nama' => ['required', 'string', 'min:3', 'max:50'],
        'nik' => ['required', 'string', 'min:16', 'max:16', 'unique:user,id'],
        'telp' => ['required', 'string', 'min:12', 'max:13', 'unique:user,id'],
        'provinsi_id' => ['required'],
        'kota_id' => ['required'],
        'kecamatan_id' => ['required'],
        'desa_id' => ['required'],
        'foto' => ['mimes:jpeg,jpg,png'],
        'level' => ['required'],
        'alamat' => ['required'],
    ]);
    $validasi['password'] = Hash::make('password');
    $user->update($validasi);
    if($request->hasFile('foto')){
        $request->file('foto')->move('images/',$request->file('foto')->getClientOriginalName());
        $user->foto = $request->file('foto')->getClientOriginalName();
        $user->save();
     }

    return redirect()->route('user.index');
}