How can I display a view based on a database value - django

Question

I want to use one view (URL) for 2 conditions.
In my application, "owners" create daily plans for routes they manage, and update the plans/results throughout the day.
class DailyRoute(models.Model):
owner = models.ForeignKey(Owner)
route = models.ForeignKey(Route)
driver = models.ForeignKey(Driver)
stops = models.PositiveSmallIntegerField(default=0, ...
on_duty_hours = models.TimeField(default=datetime.time...
date = models.Datefield(...
finalized = models.Boolean(...
Essentially, there are 3 database conditions, 2 of which I'm trying to use for a view:
No database row for the date/route. This means that the owner hasn't created a plan for the day. (e.g. if DailyRoute.objects.filter(stage = 0).count() == 0:...)
A database row for the date/route with finalized = False. This means that a plan has been created for the day for the date/route pair and can be edited.
(e.g. DailyRoute.objects.filter(stage = 0).count() >0 )
A database row for the date/route with finalized = True. This means that a plan/updates for the day are complete and no further edits are allowed. (e.g. if DailyRoute.objects.filter(stage = 1).count() > 0:...)
As a daily activity, I want the user to go to a URL (e.g. /account/daily) and be presented with one of these views:
a) If no owner routes (point 1 above), provide an "Add" button to add a row for each owned route for a specific date (i.e. next business day). On success, display the DailyRoute List as per b) below.
b) If owner routes exist in the 0 state, display the list (i.e. don't display the "Add" button.)
Note that an owner can never have more than one date / route pair in the 0 state. They must complete the day's activities on 0 state routes before they can plan the next days routes.
Alternatively, it would be acceptable to have View with a disabled "Add" button and a list of routes, if routes are in the 0 state. Conversely, the "Add" button would be enabled and an empty list of routes, if no routes are found.
Right now I can do this with separate URLs, one for add daily plan, the other to display a list of routes in stage=0, but it would be much better to do this all on the same URL.
I can't figure out how/where to add a filter to a view to do this.
Thanks in advance for guidance.

Answer 1

Well, sounds like a simple if/else statement would do the trick:
class YourView(View):
if first_condition:
return render('first_template')
else if second_condition:
return render('second_template')
else:
return render('third_template')
Or, if you want to use one template, you can do this if/else inside your template. I also suggest that you send that flag from your view:
class YourView(View):
...
routes_exist = DailyRoute.objects.filter(stage = 0).exists()
return render('template.html', {'routes_exist': routes_exist})
Then in your template:
{% if routes_exsist %}
<button> Add </button>
{% endif %]
Hope it helps!