So I have a question about session keys, normally when a user visits the site for the first time a session key does not exist yet hence you have to set a default.
set_date = request.session.get('set_date', '2017-07-06')
I use sessions to store an user given date and use this date in different views. The code below does almost exactly what I want it to do, at least without a default set. When I set a default value for 'set_date', I can't seem to use the date in different views, once I switch views the default is set again.
What's the right way to set a default to 'set_date'?
views.py
"""
Check-ins listview
"""
from .forms import DateSelection
class CheckInsListView(generic.ListView, FormMixin):
form_class = DateSelection
model = Delivery
paginate_by = 10
queryset = Delivery.objects.filter(status='AR')
template_name = 'check-ins.html'
"""
Save the user given date in a session key set_date
"""
def get_context_data(self, *args, **kwargs):
context = super(CheckInsListView, self).get_context_data(*args, **kwargs)
user_date = self.request.GET.get("date_selection")
if user_date: # If user enters date
self.request.session['set_date'] = user_date # Save given date in session
context ['set_date'] = self.request.session['set_date'] # Sent date to context
else:
context ['set_date'] = self.request.session['set_date'] # Use date from session
return context
"""
Use the date from session to filter the query results
"""
def get_queryset(self):
queryset = super(CheckInsListView, self).get_queryset()
user_date = self.request.GET.get('date_selection')
session_date = self.request.session['set_date']
if user_date:
return queryset.filter(arrival_date__icontains=user_date) # Filter on user given date
else:
return queryset.filter(arrival_date__icontains=session_date) # Filter on date from session
return queryset # Return queryset without filter
Thanks in advance!
In your question you mention get, which returns a default value if the key does not exist, but does not set the default value.
Use setdefault to set the default value when the key does not exist.
set_date = request.session.setdefault('set_date', '2017-07-06')