Django dropdown choice selection - django

Question

I would like to create 'dropdown' menu in template1 with a choice selection. dropdown should list unique dates from the range of Room instances 'created_date' attribute.
Once choice is selected and submitted it should be passed to template2. It needs to be passed to template2 so the view that renders template2 can filter Room instances by selected choice and display filtered instances in template2.
Can somebody list for me the required steps I need to complete to do what's written above ? I would read about these required steps so can achieve this task.
Below is my class.
class Room(models.Model):
flat = models.ForeignKey(Flat)
room_name = models.CharField(max_length= 10)
room_value = models.PositiveSmallIntegerField(default=0)
created_date = models.DateField(auto_now_add= True)
I have tried so far to create such dropdown menu and can do it but I do not know how to pass selected choice to template2 so selected choice can be used be the view that renders template2 to filter instances of Room class.
EDIT
I have created view, form and template but I have not managed to pass update_date yet.
views.py
def room_choice(request):
form = RoomChoiceForm()
if request.method == 'POST':
form = RoomChoiceForm(request.POST)
if form.is_valid():
room_choice = form.save(commit=False)
print room_choice
return redirect('/blocks/all_rooms',request)
return render(request, 'prostats/choicesform.html',{'form':form})
forms.py
class RoomChoiceForm(forms.ModelForm):
class Meta:
model = RoomLog
fields = ('room',)
choicesforms.html
<form method="post" class="post-form">
{% csrf_token %}
{{ form.as_p }}
<button type="submit" class="save btn btn-default">Submit</button>
</form>
url
url(r'^choices/$', views.room_choice, name='choices'),
url(r'^all_rooms/$', views.AllRoomsView.as_view(), name='roomsdetails'),

Answer 1

If I understand correctly:
First step is a form where the user selects some options from a list. The result is something like: choices=A,B,C
Taking the choices from step 1 (A,B,C) you want to display something based on that selection.
Simply use a regular HTML form with method GET for step 1:
<form method="GET" action="{% url 'name-of-url-of-step2' %}">
<select multiple>
<option name="choices" value="A"...>
<option name="choices" value="B"...>
<option name="choices" value="C"...>
<option name="choices" value="D"...>
</select>
</form>
Submitting this form will call the url specified in the form action with the query string generated from the form fields: http://.../<url-to-step2>/?choices=A&choices=B (depending on the selection)
Note that it is normal that the query string will be discarded should there be one in the action url, and it will be replaced with the form data.
The Django view that implements step 2 can now read the query parameters: self.request.GET.getlist('choices') will return ['A','B'].