title: how can i make pull_to_refresh refresh when change city in flutter
body: <p>I am using the <code>pull_to_refresh package</code> to get a list of data from API</p>
  <pre><code>MedicalListModel result = await medicalListViewModel.fetchMedicalListPerCity(cityID: cityId, pageNumber: providerPageNumber.getPageNumber);
  </code></pre>
  <p>how can I make <code>pull_to_refresh package</code> refresh when choosing another city and get a list of data from API. &quot;each city has a different data&quot;</p>