I am trying to display the state values for each country name in Django app. To save the user response, I am using Django generic CreateView. My models look something like this:
class Question(model.Models):
ques_id = models.AutoField(primary_key=True)
country = models.ForeignKey(Country)
state = models.CharField(max_length=...)
class Test(model.Models):
test = models.AutoField(primary_key=True, )
test_num = models.CharField(max_length=6, )
class Response(model.Models):
response = models.AutoField(primary_key=True)
test_id = models.ForeignKey(Test, related_name='test', )
ques_offered = models.ForeignKey(Question, related_name='choice',
ans_submitted = models.CharField(max_length=240,
To display the available choices for field state for each country value (in the db), I am looping through Django management form for the formset in my template. However, I am unable to get to the values of field state instead I am getting the country values.
Additional info:
The views that I am using to achieve this:
class ResponseCreateView(CreateView):
template_name = ...
model = Test
form_class = # Form_name
def get_context_data(self, **kwargs):
data = super(ResponseCreateView, self).get_context_data(**kwargs)
if self.request.POST:
data['get_response'] = responseFormset(self.request.POST, self.request.FILES)
else:
data['get_response'] = responseFormset()
def form_valid(self, form):
context = self.get_context_data()
get_response = context['get_response']
with transaction.atomic():
if get_response.is_valid():
self.object = form.save()
get_response.instance = self.object
get_response.save()
return redirect('...')
else:
context.update({'get_response': get_response,
})
return self.render_to_response(context)
return super(ResponseCreateView, self).form_valid(form)
Related
I keep getting this very same type error even though I am using set. Can someone maybe point out what I'm doing wrong in my api endpoint?
views.py
#require_http_methods(["GET", "POST"])
def api_requerimientos(request):
if request.method == "GET":
requerimientos = FormularioCliente.objects.all()
return JsonResponse(
{"requerimientos": requerimientos},
encoder=FormularioClienteEncoder,
)
elif request.method == "POST":
print("POST REQUEST HIT")
try:
content = json.loads(request.body)
except json.JSONDecodeError:
return HttpResponseBadRequest("Invalid JSON in request body")
requerimiento = FormularioCliente(**content) # Create a new FormularioCliente object
if "technicians" in content and isinstance(content["technicians"], list):
try:
technicians_id_list = content["technicians"]
technicians = Technician.objects.filter(employee_number__in=technicians_id_list)
requerimiento.technicians.set(technicians)
requerimiento.save()
print('requerimiento:', requerimiento)
except Technician.DoesNotExist:
pass
requerimiento.save() # Save the object to the database
models.py
class FormularioCliente(models.Model):
empresa = models.CharField(max_length=21, null=True, unique=True)
titulo = models.CharField(max_length=66)
descripcion = models.CharField(max_length=66)
enlace = models.URLField(null=True)
tipo = models.CharField(max_length=17, choices=TIPO_REQUIRIMIENTO, default="tecnologia")
date = models.DateField(null=True, auto_now_add=True)
time = models.TimeField(null=True, auto_now_add=True)
entrega = models.DateField(null=True)
finished = models.CharField(max_length=19, choices=TIPO_FINALIZACION, default="Abierto")
technicians = models.ManyToManyField(Technician, blank=True)
special_hours = models.SmallIntegerField(default=0)
regular_hours = models.PositiveSmallIntegerField(default=1)
total_hours = models.SmallIntegerField(default=1)
importancia = models.PositiveSmallIntegerField(default=1)
file = models.FileField(upload_to='files', blank=True)
updated = models.DateField(auto_now=True)
def __str__(self):
return f'{self.titulo}: {self.descripcion} # {self.date}'
def technicians_as_json(self):
return list(self.technicians.all().values())
class Technician(models.Model):
name = models.TextField()
employee_number = models.SmallIntegerField(unique=True, primary_key=True)
def __str__(self):
return self.name + " - " + str(self.employee_number)
encoders.py
class TechnicianEncoder(ModelEncoder):
model = Technician
properties = ["name", "employee_number"]
class FormularioClienteEncoder(ModelEncoder):
model = FormularioCliente
properties = [
"id",
"empresa",
"titulo",
"descripcion",
# "user",
"enlace",
# "tipo",
# "File",
"tipo",
"date",
"time",
"entrega",
"finished",
"technicians", # <-- Add this
"special_hours",
"regular_hours",
"total_hours",
"importancia",
"updated",
]
encoders = {"technicians": TechnicianEncoder()}
I also tried to loop through technicians queryset and add it to the instance one by one as well via the add() method but that also didn't work.
I even tried this:
techs = list(requerimiento.technicians.filter(employee_number__in=technicians_id_list).all())
requerimiento.technicians.set(techs)
None of it worked
I'm trying to code the page so that every user has its userpage where they can add their own info ( in this case YCD data). Now I'm trying to code the add button, with which user will be able to add a note to its personal page.
def add_YCD(request):
current_user = request.user
current_profile = Profile.objects.get(user_id = current_user.id)
if request.method == "POST":
if current_user.is_authenticated:
YCD_form = YCDForm(request.POST, instance = current_profile)
if YCD_form.is_valid():
YCD_form.save()
messages.success(request,('Your profile was successfully updated!'))
else:
messages.error(request,('Unable to complete request'))
return redirect("main:homepage")
YCD_form = YCDForm(instance = current_profile)
return render(request = request,
template_name = "main/add_YCD.html",
context = {"YCD_form": YCD_form,
"user": request.user,})
The code works without instance = current_profile, it just saves the note to database but doesn't display it on the userpage. I've also tried using instance = request.user.profile.
But it doesn't work at all.
Here are the Models themselves:
class Yield_Curve_Data(models.Model):
b1 = models.BigIntegerField()
b2 = models.BigIntegerField()
b3 = models.BigIntegerField()
tau = models.BigIntegerField()
Date = models.DateTimeField('date published', default = datetime.now)
class Profile(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE)
yield_curve_data = models.ManyToManyField(Yield_Curve_Data, null = True)
#receiver(post_save, sender = User)
def create_user_profile(sender, instance, created, **kwargs):
if created:
Profile.objects.create(user=instance)
#receiver(post_save, sender = User)
def save_user_profile(sender, instance, **kwargs):
instance.profile.save()
And here's the code for forms:
class YCDForm(forms.ModelForm):
class Meta:
model = Yield_Curve_Data
fields =('b1', 'b2', 'b3', 'tau',)
Is there another way to specify the user itself or o I need to change the code completely?
Thanks
Im using django for a web app and i am creating REST API views. Is there a way i can access two tables in one view? If not, how can can i retrieve a non-foreign key column from a related record. The below code is retrieving a vase record based on a URL parameter. I want to access the artistName which is stored in artist table (a one-to-many with Vase table), not artist_id which is stored in Vase
class FilterVases(generics.ListAPIView):
serializer_class = VaseSerializer
def get_queryset(self):
queryset = Vase.objects.all()
artist_id = self.request.query_params.get('artist_id')
if artist_id is not None:
queryset = queryset.filter(artist_id=artist_id)
vaseID = self.request.query_params.get('vaseID')
if vaseID is not None:
queryset = queryset.filter(vaseID=vaseID)
return queryset
edited to add
This is models for Artist and Vase:
class Artist(models.Model) :
artistID = models.CharField(max_length=10)
artistName = models.CharField(max_length=100)
class Vase(models.Model):
vaseID = models.CharField(max_length=10)
vaseRef = models.CharField(max_length=255,blank=True,null=True)
inscription = models.CharField(max_length=255,blank=True,null=True)
fabric = models.CharField(max_length=100, blank=True,null=True)
subject = models.CharField(max_length=255,blank=True,null=True)
technique = models.CharField(max_length=100,blank=True,null=True)
height = models.FloatField(max_length=100,blank=True,null=True)
diameter = models.FloatField(max_length=100,blank=True,null=True)
shape = models.ForeignKey(Shape, on_delete=models.CASCADE)
artist = models.ForeignKey(Artist, on_delete=models.CASCADE)
provenance = models.ForeignKey(Provenance, on_delete=models.CASCADE)
collection = models.ForeignKey(Collection, on_delete=models.CASCADE)
In the Vase model add this:
def artist_name(self):
return self.artist.artistName
Hence, it will look like:
class Vase(models.Model):
vaseID = models.CharField(max_length=10)
vaseRef = models.CharField(max_length=255,blank=True,null=True)
inscription = models.CharField(max_length=255,blank=True,null=True)
fabric = models.CharField(max_length=100, blank=True,null=True)
subject = models.CharField(max_length=255,blank=True,null=True)
technique = models.CharField(max_length=100,blank=True,null=True)
height = models.FloatField(max_length=100,blank=True,null=True)
diameter = models.FloatField(max_length=100,blank=True,null=True)
shape = models.ForeignKey(Shape, on_delete=models.CASCADE)
artist = models.ForeignKey(Artist, on_delete=models.CASCADE)
provenance = models.ForeignKey(Provenance, on_delete=models.CASCADE)
collection = models.ForeignKey(Collection, on_delete=models.CASCADE)
def artist_name(self):
return self.artist.artistName
In the VaseSerializer add the 'artist_name' to the fields Meta.
If you want to add this custom fields to all Vase Model fields, refer to this topic Django Rest framework, how to include '__all__' fields and a related field in ModelSerializer ?
class VaseSerializer(serializers.ModelSerializer):
class Meta:
model = models.Vase
fields = '__all__'
extra_fields = ['artist_name']
def get_field_names(self, declared_fields, info):
expanded_fields = super(VaseSerializer, self).get_field_names(
declared_fields, info)
if getattr(self.Meta, 'extra_fields', None):
return expanded_fields + self.Meta.extra_fields
else:
return expanded_fields
Below should your view:
class FilterVases(generics.ListAPIView):
serializer_class = VaseSerializer
def get_queryset(self):
queryset = Vase.objects.all()
query_artist = self.request.query_params.get('artist_name')
if query_artist is not None:
try:
artist = Artist.objects.get(artistName=query_artist)
queryset = queryset.filter(artist=artist)
except:
pass
vaseID = self.request.query_params.get('vaseID')
if vaseID is not None:
queryset = queryset.filter(vaseID=vaseID)
return queryset
I have Form ModelChoiceField from ForeignKey model
my Model is:
class Fielinfo(models.Model):
Perimeter = models.CharField(max_length=50,unique=True)
FidlAbr = models.CharField(max_length=15,unique=True)
and my second model :
class Wellinfo(models.Model):
WellID = models.CharField(max_length=15,unique=True)
Perimetre = models.ForeignKey(Fielinfo ,to_field='Perimeter', on_delete=models.CASCADE)
and my forms.py is:
class NewWells(forms.ModelForm):
Perimetre = forms.ModelChoiceField(queryset=Fielinfo.objects.all(),label='Perimetre', required=True)
the problem is When I need to update my view it doesn't gave me the initial value?
How do I solve this Please? (in the admin area it gave me the initial value).
my views.py is:
class PostUpadtW(UserPassesTestMixin, LoginRequiredMixin, UpdateView):
model = Wellinfo
template_name = 'Home/WELLINFO/Upd_W.html'
form_class = NewWells
def form_valid(self, form):
form.instance.author = self.request.user
return super().form_valid(form)
def test_func(self):
post = self.get_object()
if self.request.user== post.author:
return True
else:
return False
using ForeignKey is so complicated in Django so i solved it like this;
in models.py
class Fielinfo(models.Model):
Perimeter = models.CharField(max_length=50,unique=True)
FidlAbr = models.CharField(max_length=15,unique=True)
and I changed this
class Wellinfo(models.Model):
WellID = models.CharField(max_length=15,unique=True)
Perimetre = models.CharField(max_length=50)
and in my forms.py i did this :
class NewWells(forms.ModelForm):
TFTFields =Fielinfo.objects.all()[0:]
ListField= []
for fields in TFTFields:
ListField += [fields.Perimeter]
ChoiceItems= list(zip(ListField, ListField))
Perimetre = forms.ChoiceField(label='Perimetre',choices=ChoiceItems)
I created a datamodel in Django, and now I created a script to auto populate the models using web-scraped values. However when I run the script I get the following error:
ValueError: variable needs to have a value for field "id" before this many to many relationship can be used
Models.py
class Books(models.Model):
title = models.CharField(max_length=100)
def __str__(self):
return self.title
class Meta:
ordering = ['-title']
class Author(models.Model):
book = models.ManyToManyField(Books)
first_name = models.CharField(max_length=150)
last_name = models.CharField(max_length=200)
def __str__(self):
return "{} {}".format(self.first_name, self.last_name)
class Meta:
ordering = ['last_name','first_name']
class Book_details(models.Model):
book = models.ForeignKey(Books,
on_delete=models.CASCADE,
null=True) # models.SET_NULL weggehaald
pages = models.CharField(max_length=250)
publ_year = models.CharField(max_length=250)
edition = models.CharField(max_length=30) # paperback, hardcover, audiobook, etc
def __str__(self):
return "{} - pages: <{}>, edition: <{}>".format(self.book.title,
self.pages,
self.edition)#
class Cover(models.Model):
book = models.OneToOneField(Books,
on_delete=models.CASCADE)
path = models.CharField(max_length=500)
def __str__(self):
return "<Cover <path={}>".format(self.id, self.path)
populate_script
def add_book(title):
b = Books.objects.get_or_create(title = title)[0]
print(b)
b.save()
return b
def populate(scraped_tuple):
fake = Faker()
for _ in range(len(scraped_tuple)):
b_title = scraped_tuple[_][0][0]
new_book = add_book(b_title)
b_author_first = scraped_tuple[_][0][1].split(" ")[0]
b_author_last = scraped_tuple[_][0][1].split(" ")[1]
b_pages = scraped_tuple[_][0][2].split(" ")[0]
b_publ_year = fake.year()
b_edition = scraped_tuple[_][0][3].split(",")[0]
b_cover = scraped_tuple[_][0][4]
new_details = Book_details.objects.get_or_create(book = new_book, pages = b_pages, publ_year = b_publ_year, edition = b_edition)[0]
new_author = Author.objects.get_or_create(book = new_book, first_name = b_author_first, last_name = b_author_last)[0]
new_cover = Cover.objects.get_or_create(book = new_book, path = b_cover)[0]
The scraped_tuple is a return value from the webscraper containing the details.
(Part of) the Traceback:
Books.models.DoesNotExist: Author matching query does not exist.
File "C:\path\to\LibraryApp\Library_WebA
pp\Library\populate.py", line 45, in populate
new_author = Author.objects.get_or_create(book = new_book, first_name = b_author_first, last_nam
e = b_author_last)[0]
Followed by:
ValueError: "<Author: Mary McCarthy>" needs to have a value for field "id" before this many-to-many relationship can be used.
So, it seems that something goes awfully wrong when trying to execute the new_author statement, because of the many-to-many field "book" in the Author model. How can I resolve this. Do I need a similar function for an Author object like I have for the Book in add_book()?
It seems the new_details statement executes just fine (title and book_details appear correctly in the database in the admin part of Django).
As mentioned in the docs, user .add() to associate the records in many to many field.
def populate(scraped_tuple):
fake = Faker()
for _ in range(len(scraped_tuple)):
b_title = scraped_tuple[_][0][0]
new_book = add_book(b_title)
b_author_first = scraped_tuple[_][0][1].split(" ")[0]
b_author_last = scraped_tuple[_][0][1].split(" ")[1]
b_pages = scraped_tuple[_][0][2].split(" ")[0]
b_publ_year = fake.year()
b_edition = scraped_tuple[_][0][3].split(",")[0]
b_cover = scraped_tuple[_][0][4]
new_details = Book_details.objects.get_or_create(book = new_book, pages = b_pages, publ_year = b_publ_year, edition = b_edition)[0]
new_author = Author.objects.get_or_create(first_name = b_author_first, last_name = b_author_last)[0]
# add many to many fields this way:
new_author.book.add(new_book)
new_cover = Cover.objects.get_or_create(book = new_book, path = b_cover)[0]