Django modelform NameError: name 'check_in' is not defined - django

Question

Hi everyone I am a beginner in django, building a lodge reservation system with django3.0 and i can't seem to get my modelform to generate a proper queryset to get data in my Reservations model, i keep getting the NameError error message everytime i try enter a new date through my view and right now im not quite sure how to properly solve this error
here is my models.py:
from django.db import models
from django.utils import timezone
from django.contrib.auth.models import User
now = timezone.now
end = timezone.now() + timezone.timedelta(days=2)
room_choices = [
('single_room', 'Single Room'),
('double_room', 'Double Room'),
('executive_room', 'Executive Room'),
]
class Reservation(models.Model):
room_type = models.CharField(max_length=30, choices=room_choices, default=room_choices[1])
check_in = models.DateField(default=timezone.now)
check_out = models.DateField(default=end)
class Meta:
verbose_name = 'Reservation'
verbose_name_plural = 'Reservations'
I would like to add validation statements later in views.py for price and number of rooms depending on the room_type the user selected so disregard the field for now
here is my forms.py:
from django import forms
from .models import Reservation
class AvailabilityForm(forms.ModelForm):
class Meta:
model = Reservation
fields = [
"room_type",
"check_in",
"check_out",
]
widgets = {
'check_in': forms.DateInput(format='%m/%d/%Y'),
'check_out': forms.DateInput(format='%m/%d/%Y'),
}
If someone knows how to get the widgets to work properly outside of admin, displaying the calender onclick and not not just a charfield with a datefield inside, please also help me fix this problem as well
here is my views.py:
from django.shortcuts import get_object_or_404, render
from datetime import timedelta, date
from django.contrib.auth.models import User
from django.contrib import messages
from . import forms
from .models import Reservation
def availability(request):
form = forms.AvailabilityForm()
reservation = Reservation
if request.method == 'POST':
form = forms.AvailabilityForm(request.POST or None)
if form.is_valid:
reserve = form.save(commit=False)
reserve.reservation = reservation
# check whether the dates are valid
# case 1: a room is booked before the check_in date, and checks out after the requested check_in date
case_1 = Reservation.objects.filter(check_in__lte=reserve.check_in).filter(check_out__gte=check_in)
# case 2: oom is booked before the requested check_out date and check_out date is after requested check_out date
case_2 = Reservation.objects.filter(check_in__lte=check_out, check_out__gte=check_out).exists()
#case3: room is booked in a date which lies between the two requested check-in/check-out dates
case_3 = Reservation.objects.filter(check_in__gte=check_in, check_out__lte=check_out).exists()
# if either of these is true, abort and render the error
if case_1 or case_2 or case_3:
return render(request, "availability.html", {"errors": "This room is not available on your selected dates", "form": form})
# else dates are valid
reserve.save()
messages.add_message(request, messages.SUCCESS, 'Room is available for your stay here')
return redirect("/complete_booking")
return render(request, "availability.html", {"form": form})
i have tried different methods to try get my view to validate the check_in and check_out objects as you can see case1 and case2 use different filtering techniques but neither seem to work, any help would be appreciated as to where i'm going wrong and how to fix it

Answer 1

From the comments, the error is:
File "C:\Users\Karabo\Documents\technocrats2\core\views.py", line 160, in availability
case_1 = Reservation.objects.filter(check_in__lte=check_in).filter(check_out__gte=check_out).exists()
NameError: name 'check_in' is not defined
After checking the traceback, it is clear that you haven't define any check_in variable. You need to define the variable before using it.
check_in = "18-01-2020" # value you want to use in queryset.
case_1 = Reservation.objects.filter(check_in__lte=reserve.check_in).filter(check_out__gte=check_in)