python - Django ListView customising queryset -

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hopefully should simple 1 me with.

i have page dropdown menu containing 3 items:

<form method="get">      <select name="browse">          <option>cats</option>          <option>dogs</option>          <option>worms</option>      </select>   <input type="submit" value="submit" />  </form>  <!-- output table -->    <table id="mytable">        <thead>           <tr>             <th>name</th>             <th>colour</th>           </tr>       </thead>        <tbody>       {% object in object_list %}           <tr>             <td>{{ object.name }}</td>             <td>{{ object.colour }}</td>           </tr>       {% endfor %}       </tbody>    </table>  <!-- pagination controls -->  <div class="pagination">     <span class="page-links">         {% if page_obj.has_previous %}             <a href="?page={{ page_obj.previous_page_number }}">previous</a>         {% endif %}         <span class="page-current">             page {{ page_obj.number }} of {{ page_obj.paginator.num_pages }}.         </span>         {% if page_obj.has_next %}             <a href="?page={{ page_obj.next_page_number }}">next</a>         {% endif %}     </span> </div>

when user selects item , hits submit, given results in table generated generic listview:

class browse(generic.listview):     template_name = 'app/browse.html'     paginate_by = 25      def get_queryset(self):         queryset = cats.objects.all()         if self.request.get.get("browse"):             selection = self.request.get.get("browse")             if selection == "cats":                 queryset = cats.objects.all()             elif selection == "dogs":                 queryset = dogs.objects.all()             elif selection == "worms":                 queryset = worms.objects.all()             else:                 queryset = cats.objects.all()         return queryset

however, when attempt turn page using pagination controls, queryset resets first (default) item cats, because (i think) form data reset.

any idea how circumvent problem?

thanks!

ps: oh, on note, possible set queryset none begin with? obliged!

update: when use pagination on cats queryset works fine bug displayed on other 2 sets.

to solve problem modified pagination html, accommodate both request form , page number in url string, so:

<div class="pagination">     <span class="page-links">         {% if page_obj.has_previous %}             <a href="/browse/?browse={{ input }}&page={{ page_obj.previous_page_number }}">previous</a>         {% endif %}         <span class="page-current">             page {{ page_obj.number }} of {{ page_obj.paginator.num_pages }}.         </span>         {% if page_obj.has_next %}             <a href="/browse/?browse={{ input }}&page={{ page_obj.next_page_number }}">next</a>         {% endif %}     </span> </div>

the {{ input }} here string containing option submitted via form, e.g. 'cats' or 'worms'.

to able pass template, modified get_context_data method of class based view such:

class browse(generic.listview):     template_name = 'app/browse.html'     paginate_by = 25      # modifying get_context_data method      def get_context_data(self, **kwargs):         context = super(browse, self).get_context_data(**kwargs)         q = self.request.get.get("browse")         context['input'] = q         return context      def get_queryset(self):         queryset = cats.objects.all()         if self.request.get.get("browse"):             selection = self.request.get.get("browse")             if selection == "cats":                 queryset = cats.objects.all()             elif selection == "dogs":                 queryset = dogs.objects.all()             elif selection == "worms":                 queryset = worms.objects.all()             else:                 queryset = cats.objects.all()         return queryset

that it, url string reads like: 

/browse/?browse=cats&page=3

so there is, pagination works alongside method of form.


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