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Validation not exist in table laravel

    public function rules()
    {
        return [
            'phone_number' =>[
              'required' ,
              'unique:users,phone_number'
            ],
        ];
    }

Validation not exists with this id laravel

$e = Subscription::find($request->subscription_id);
$rules = [
  'subscription_id' => 'required|integer|exists:subscriptions,id',
  'date' => 'required|date|after:yesterday',
  'date' => Rule::unique('member_attendances')->where(function ($query) use ($e) {
              return $query->where('member_id', $e->member_id);
})
//|unique:member_attendances,date,'.$e->member_id . ',member_id',
];

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