Develop Reference

Django unable to iterate prefetch_related objects at template

I'm unable to access my prefetch_related objects at my template, can smb help
views.py
def support(request, pk=None):
...
else:
list_support_tickets = sorted(
chain(
SupportTickets.objects.filter(Q(status=0) | Q(status=1), requester=request.user).prefetch_related('reply_relation'), #Can't iter object
), key=attrgetter('creation_date'), reverse=True
)
paginator = Paginator(list_support_tickets, 10)
page = request.GET.get('page')
support_tickets = paginator.get_page(page)
args = {'support_tickets': support_tickets,
'form': form
}
print(list_support_tickets)
return render(request, template, args)
At my template I do the following:
{% for support_ticket in support_tickets %}
...
{% for reply in support_ticket.reply_relation %}
<span class="font-size-small">We have a query, yeah</span>
{% endfor %}
{% endfor %}
But I'm unable get a query here, error:
TypeError: 'GenericRelatedObjectManager' object is not iterable
models.py
class SupportTicketMessages(models.Model):
content_type = models.ForeignKey(ContentType, limit_choices_to=referential_models, on_delete=models.CASCADE)
object_id = models.CharField(max_length=36)
content_object = GenericForeignKey('content_type', 'object_id')
id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
author = models.ForeignKey(User, on_delete=models.CASCADE, related_name='support_ticket_reply_author', verbose_name='Author', blank=True)
reply = models.TextField(verbose_name="Reply Content", max_length=2000)
date = models.DateTimeField(auto_now_add=True, blank=False)
class SupportTickets(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False, unique=True)
ticket_id = models.IntegerField(default=ticket_id_generator, unique=True, blank=False, null=False, editable=False)
requester = models.ForeignKey(User, on_delete=models.CASCADE, null=False, blank=False)
category = models.IntegerField(choices=TICKET_CATEGORY, verbose_name='Ticket Category')
subject = models.CharField(max_length=40)
problem_description = models.TextField(max_length=5000)
status = models.IntegerField(choices=STATUS_OF_TICKET, verbose_name='Ticket Status', default=0)
reply_relation = GenericRelation(SupportTicketMessages, related_query_name='reply_relation')
creation_date = models.DateTimeField(auto_now_add=True, null=True)
Thanks in advance

support_ticket.reply_relation is a manager, not a QuerySet, so you can not iterate over it, you use .all() [Django-doc] to iterate over this:
{% for support_ticket in support_tickets %}
…
{% for reply_relation in support_ticket.reply_relation.all %}
…
{% endfor %}
{% endfor %}

How to render data from multiple models django

I want to render data to my webpage from my django app however only two of the required slots are being rendered
my models are:
class Order(models.Model):
customer = models.ForeignKey(Customer, on_delete=models.SET_NULL, null=True, blank=True)
date_ordered = models.DateTimeField(auto_now_add=True)
complete = models.BooleanField(default=False)
transaction_id = models.CharField(max_length=100, null=True)
class OrderItem(models.Model):
product = models.ForeignKey(Product, on_delete=models.SET_NULL, null=True)
order = models.ForeignKey(Order, on_delete=models.SET_NULL, null=True)
quantity = models.IntegerField(default=0, null=True, blank=True)
date_added = models.DateTimeField(auto_now_add=True)
class Customer(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE, null=True, blank=True)
name = models.CharField(max_length=200, null=True)
email = models.CharField(max_length=200, null=True)
class Product(models.Model):
name = models.CharField(max_length=200)
price = models.DecimalField(max_digits=7, decimal_places=2)
digital = models.BooleanField(default=False,null=True, blank=True)
image = models.ImageField(null=True , blank=True)
description = models.TextField(max_length=5000, null=True)
points = models.DecimalField(max_digits=5,decimal_places=0, null=True)
and my views are
def admin_dashboard (request):
order_list = Order.objects.all()
context = {'order':order_list}
template = "admin_dashboard.html"
return render(request, 'store/admin_dashboard.html', context)
my HTML is:
{% extends 'store/admin_main.html' %}
{% load static %}
{% block content %}
{% for order in order %}
<h6>{{ order.transaction_id }}</h6>
<p>{{ order.customer }}</p>
<p>{{ order.shippingaddress }}</p>
<p>{{ order.orderitem }}</p>
{% endfor%}
{% endblock content %}
1598061443.212917
userNew
which is just the transaction id and user.
how can I have all the rest of fields filled

Django How to get a queryset from a queryset in template

I want to filter a queryset that depends on another queryset that already depends on another queryset
My models.py
class Escola(models.Model):
id = models.AutoField(db_column='ID', primary_key=True)
nome = models.CharField(db_column='Nome', max_length=255, blank=True, null=True)
class Inscrio(models.Model):
id = models.AutoField(db_column='ID', primary_key=True)
escolaid = models.ForeignKey(Escola, models.DO_NOTHING, db_column='EscolaID', blank=True, null=True)
class Utilizador(AbstractBaseUser)
id = models.AutoField(db_column='ID', primary_key=True)
inscriçãoid = models.ForeignKey(Inscrio, models.DO_NOTHING, db_column='InscriçãoID', blank=True, null=True)
My views.py
def view_forms(request):
return render(request,
"main/view_forms.html",
{"escolas": Escola.objects.all(),
})
I am doing
{% for escola in escolas %}
{% for inscrio in escola.inscrio_set.all %}
{% for utilizador in inscrio.utilizador_set.all %}
<tr>
<td><center>{{inscrio.id}}</center></td>
<td><center>{{escola.nome}}</center></td>
<td><center>{{utilizador.id}}</center></td>
{% endfor %}
{% endfor %}
{% endfor %}
I am currently trying to get the Inscrio data from Escola.
But when I try to get the Utlizador data from the Inscrio I get nothing.
How can I do this?
Thanks in advance

Escola.objects.all method is not executed and is passed into the template as a method.
To fix this, add Parentheses to the end. Escola.objects.all()

If you are extending AbstractBaseUser then you should provide USERNAME_FIELD.
Here Utlizador doesn't save any record due to this error so correct as below
class Utilizador(AbstractBaseUser):
id = models.AutoField(db_column='ID', primary_key=True)
inscriçãoid = models.ForeignKey(Inscrio, models.DO_NOTHING, db_column='InscriçãoID', blank=True, null=True)
username = None
email = models.EmailField('email address', unique=True)
USERNAME_FIELD = 'email'
REQUIRED_FIELDS = []

Trying to access model in form by going through another model

I am not that good at queries, so I need some help. I have a Course model, and a TeacherData model. Each teacher has its own courses. But when a teacher makes an account I use a Teacher model. And if teacher_ID column from TeacherData doesn't match the one entered by the user, the account cannot be created.
Now, in my form I need to show Courses for each teacher, so that a Lecture instance can be created. I was thinking to use teacher_ID as bridge connecting Teacher model with TeacherData model and then I would be able to show the courses that only a specific teacher has.
This is what I tried, but can't figure out:
class Teacher(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE, primary_key=True)
name = models.CharField(max_length=30, null=True, blank=True, default=None)
surname = models.CharField(max_length=50, null=True, blank=True, default=None)
email = models.EmailField(unique=True, null=True, blank=True, default=None)
teacher_ID = models.CharField(unique=True, max_length=14,
validators=[RegexValidator(regex='^.{14}$',
message='The ID needs to be 14 characters long.')],
null=True, blank=True, default=None)
class Lecture(models.Model):
LECTURE_CHOICES = (
('Courses', 'Courses'),
('Seminars', 'Seminars'),
)
course = models.ForeignKey('Course', on_delete=models.CASCADE, default='', related_name='lectures',)
lecture_category = models.CharField(max_length=10, choices=LECTURE_CHOICES, default='Courses',)
lecture_title = models.CharField(max_length=100, blank=True, null=True)
content = models.TextField(blank=False, default=None)
class Course(models.Model):
study_programme = models.ForeignKey('StudyProgramme', on_delete=models.CASCADE, default='')
name = models.CharField(max_length=50, unique=True)
ects = models.PositiveSmallIntegerField(validators=[MaxValueValidator(99)])
description = models.TextField()
year = models.PositiveSmallIntegerField(validators=[MaxValueValidator(99)])
semester = models.IntegerField(choices=((1, "1"),
(2, "2"),
), default=None)
teacher1 = models.ForeignKey('TeacherData', on_delete=models.CASCADE, default=None,
verbose_name="Course Teacher", related_name='%(class)s_course_teacher')
teacher2 = models.ForeignKey('TeacherData', on_delete=models.CASCADE, default=None, null=True,
verbose_name="Seminar Teacher", related_name='%(class)s_seminar_teacher')
class TeacherData(models.Model):
name = models.CharField(max_length=30)
surname = models.CharField(max_length=50)
teacher_ID = models.CharField(unique=True, max_length=14)
notes = models.CharField(max_length=255, default=None, blank=True)
Run code snippetExpand snippet
class LectureForm(forms.ModelForm):
lecture_title = forms.CharField(max_length=100, required=True)
course = forms.ModelChoiceField(initial=Course.objects.first(), queryset=Course.objects.filter(
Q(teacher1__surname__in=[t.surname for t in TeacherData.objects.filter(
Q(teacher_ID__iexact=[x.teacher_ID for x in Teacher.objects.all()]))])))
class Meta:
model = Lecture
fields = ('course', 'lecture_category', 'lecture_title', 'content')
The expected behavior is when teacher is logged in, they would able to add a new lecture only for courses that they teach. I can achieve roughly the same effect by doing the following in a template
{% for data in teacher_data %}
{% if data.teacher_ID == user.teacher.teacher_ID %}
{% for course in courses %}
{% if course.teacher1 == data or course.teacher2 == data %}
<li>
{{ course.name }}
</li>
{% endif %}
{% endfor %}
{% endif %}
{% endfor %}

django ListView query_set code abbreviation

The codes are as
models.py
class Firm(models.Model):
name = models.CharField(unique=True, max_length=50, verbose_name="Firma Adı")
slug = models.SlugField(unique=True, editable=False, max_length=50)
class Worksite(models.Model):
firm = models.ForeignKey('Firm', verbose_name='Firma', related_name="worksites", on_delete=models.CASCADE)
name = models.CharField(unique=True, max_length=50, verbose_name="Şantiye Adı")
slug = models.SlugField(unique=True, editable=False, max_length=50)
class Subcontractor(models.Model):
worksite = models.ForeignKey('Worksite', on_delete=models.CASCADE)
firm = models.ForeignKey('Firm', related_name="subcontractors", on_delete=models.CASCADE)
Can the queryset code be written shorter?
views.py
class SubcontractorListView(ListView):
template_name = 'firm/subcontractor_list.html'
context_object_name = "firms"
def get_queryset(self):
ws = self.request.user.firm.worksites.values_list('id', flat=True)
ss = Subcontractor.objects.values_list('firm_id', flat=True).filter(worksite_id__in=ws)
return Firm.objects.filter(id__in=ss)
Do you have different and short solutions?
template
{% for firm in firms %}
<div class="btn btn-outline-secondary text-left button">{{ firm }} </div>
{% endfor %}