public function update( UserRequest $request){

    $user = User::find( $request['id'] );

    $hasuser = User::where('email','=',$request['email'])->where('id','!=',$request['id'])->first();
    if($hasuser){
        $request->session()->flash('alert-error','User with given email address already exist. Plese try with another email address!!.');
        return redirect()->route('admin.users');
    }

    $user->name =  $request['name'];
    $user->email =  $request['email'];
    $user->phone =  $request['phone'];
    $user->role =  $request['role'];

    if(!empty($request['password'])){
        $password = bcrypt($request['password']);
        $user->password = $password;
    }

    if($user->save())
        $request->session()->flash('alert-success','User updated successfully.');
    else
        $request->session()->flash('alert-error','Can not update User now. Please try again!!.');

    return redirect()->route('admin.users');
}

$hasuser = User::where('email','=',$request['email'])->where('id','!=',$request['id'])->first();