如何使用适配器模式以防万一？

Question

I have a class PieClass that accepts data $data and iterate this data by following schema:

public function setData($data) {
  foreach($data as $value) {
      $a[$value->id] = $value;
  }
}

So, it expects to get $data by the concrete format.

There is another class model is named as ClassModel. Using dependency injection it takes any model like:

class ClassModel {
   public $model;
   public function __constructor($model) {
     $this->model = $model;
   }

   public function data(){
      return $this->model->query("...")->get();
   }
}

So, as getData() get return different set of fields it should be prepared to use in PieClass class.

Therefore I try to create class Adoptor beetwen ClassModel and PieClass.

I have started to create interface:

interface IDataAdapter {
    public function data() {}
}

Then I created class:

class GraphPieWorkAdapter implements IDataAdapter {

    public function data() {

    }
}

Also class ClassModel must implement IDataAdapter:

class ClassModel implements IDataAdapter {
   public function data();
}

What to do next, how to utilize adopt pattern?