Unable to update individual items in Django - django

Question

I am trying to update some information in my Django application but I am getting this error "Cannot assign "9": "Reservation.table" must be a "Tables" instance".
I have tried so manual method also but it still same error.
Error: Cannot assign "9": "Reservation.table" must be a "Tables" instance
views.py
#login_required
def UpdateReservation(request, pk):
table_exists = get_object_or_404(Reservation, id=pk)
form = ReservationForm(instance=table_exists)
if request.method == "POST":
form = ReservationForm(request.POST, instance=table_exists)
if form.is_valid():
form = ReservationForm(request.POST, instance=table_exists)
if form.is_valid():
form.save()
return redirect('view_reservations')
messages.success(request, "successfully updated table")
context = {"form": form}
return render(request, "dashboard/super/landlord/update_reserve.html", context)
models.py
class Reservation(models.Model):
status_choices = (
("pending", "pending"),
("confirmed", "confirmed")
)
first_name = models.CharField(max_length=200)
last_name = models.CharField(max_length=200)
email = models.EmailField()
phone = PhoneNumberField(blank=True)
people = models.IntegerField(default=1)
time = models.TimeField()
date_reserved = models.DateField()
date_booked = models.DateTimeField(auto_now_add=True)
status = models.CharField(max_length=10, choices=status_choices, default="confirmed")
comment = models.TextField(blank=True)
table = models.ForeignKey(Tables, on_delete=models.CASCADE)
def __str__(self):
return self.first_name
forms.py
class ReservationForm(forms.ModelForm):
time = forms.CharField(
widget=forms.TextInput(attrs={'id': 'timepicker',
'class': 'input-group',
'placeholder': '12:00:AM'}))
date_reserved = forms.DateField(widget=forms.TextInput(
attrs={'placeholder': 'yyyy-mm-dd',
'id': 'datepicker'}), required=True,)
comment = forms.CharField(widget=forms.TextInput(
attrs={'placeholder': 'Leave a message'}), required=True,)
first_name = forms.CharField(widget=forms.TextInput(
attrs={'placeholder': 'Leave a message'}), required=False,)
email = forms.CharField(widget=forms.TextInput(
attrs={'placeholder': 'Your Email Address'}), required=True,)
phone = forms.CharField(widget=forms.TextInput(
attrs={'placeholder': 'Your Telephone number'}), required=True,)
table = forms.IntegerField(widget=forms.TextInput(
attrs={'placeholder': 'Table Number'}), required=True,)
class Meta:
model = Reservation
fields = ['first_name', 'email', 'time', 'comment',
'phone', 'date_reserved', 'people', 'table']
template.html
<div class="panel-body">
<form class="form-horizontal" role="form" method="post" enctype="multipart/form-data">
{% csrf_token %}
{% for field in form %}
<div class="form-group">
<label class="col-md-2 control-label">{{ field.label }}</label>
<div class="col-md-10">
{{ field|attr:'class:form-control'}}
</div>
</div>
{% endfor %}
<div class="form-group">
<div class="col-md-10">
<center><button class="btn btn-primary" type="submit">Update Reservation</button></center>
</div>
</div>
</div>

Answer 1

You can not make use of an IntegerField, since it expects a Table, not an integer for table. You should use a ModelChoiceField and then use a TextInput as widget:
table = forms.ModelChoiceField(
queryset=Table.objects.all()
widget=forms.TextInput(attrs={'placeholder': 'Table Number'}),
required=True
)

Answer 2

In your form remove your table field from the field list above but keep the one in the Meta, its messing with it because the value is in Integer and you have to assign an object.