....
public function edit($id){
        $dt = Customer::find($id);
        $title = "Edit customer $dt->nama";

        return view('customer.edit',compact('title','dt'));
    }

    public function update(Request $request,$id){
        $this->validate($request,[
            'email'=>'required',
            'nama'=>'required',
            'no_hp'=>'required',
            'alamat'=>'required'
        ]);

        $data['email'] = $request->email;
        $data['nama'] = $request->nama;
        $data['no_hp'] = $request->no_hp;
        $data['alamat'] = $request->alamat;
        $data['updated_at'] = date('Y-m-d H:i:s');

        Customer::where('id',$id)->update($data);

        \Session::flash('sukses','Data berhasil di update');
        return redirect('customer');
    }

    public function delete($id){
        Customer::where('id',$id)->delete();

        \Session::flash('sukses','Data berhasil dihapus');
        return redirect('customer');
    }
....