In my app i need to store invoices (Invoice) of known products (Product) to calculate points for each seller (User). I'm trying to create form to insert basic invoice data plus inline form with sold products info. To handle it i create model like this:
class Product(models.Model):
group = models.CharField(max_length = 200, blank = False)
mark = models.CharField(max_length = 200, blank = True)
points = models.IntegerField(blank = False)
class Invoice(models.Model):
price = models.FloatField(blank=False)
file = models.FileField(blank=False)
product = models.ManyToManyField(Product, through='Sold')
user = models.ForeignKey(User, on_delete=models.CASCADE)
date = models.DateField()
date_created = models.DateField(auto_now_add=True)
date_updated = models.DateField(auto_now=True)
class Sold(models.Model):
invoice = models.ForeignKey(Invoice, on_delete=models.CASCADE)
product = models.ForeignKey(Product, on_delete=models.CASCADE)
quantity = models.PositiveIntegerField(default=1)
I tried to manage it via django-admin and it work fine with admin.py:
class ProductTabular(admin.TabularInline):
model = Invoice.product.through
class InvoiceAdmin(admin.ModelAdmin):
inlines = [ProductTabular]
exclude = ('product', )
class Meta:
model = Invoice
admin.site.register(Invoice, InvoiceAdmin)
but i'm unable to create such form in own templates. Please, can you help me with views.py and template to get same result as for the django-admin?
I tried via invoce form with inlineformset_factory for the Sold model, but i can't figure out how to save it. Thanks for any help!
Related
I have a model like this:
class Cart(models.Model):
id = models.UUIDField(primary_key=True, default=uuid4)
customer = models.ForeignKey(Customer, on_delete=models.CASCADE, null=True)
class Reception(models.Model):
PAYMENT_STATUS_PENDING = 'P'
PAYMENT_STATUS_COMPLETE = 'C'
PAYMENT_STATUS_FAILED = 'F'
PAYMENT_STATUS_CHOICES = [
(PAYMENT_STATUS_PENDING, 'Pending'),
(PAYMENT_STATUS_COMPLETE, 'Complete'),
(PAYMENT_STATUS_FAILED, 'Failed')
]
cart = models.ForeignKey(Cart, on_delete=models.CASCADE, null=True)
customer = models.ForeignKey(Customer, on_delete=models.CASCADE)
entry_date = models.DateField()
total_price = models.IntegerField()
payment_status = models.CharField(
max_length=1,
choices=PAYMENT_STATUS_CHOICES,
default=PAYMENT_STATUS_PENDING
)
My question is:
How can I get a particular Cart record from the Reception model?
I tried using this serializer:
class ReceptionSerializer(serializers.ModelSerializer):
class Meta:
model = Reception
fields = ['id', 'customer', 'entry_date', 'payment_status', 'cart']
but it only returns the id of a cart. I want to return the whole object of that specific cart.
How can I do that?
If you want to utilize nested serialization, one possible solution would be to define CartSerializer and override the cart field of the ReceptionSerializer class as follows
class CartSerializer(serializers.ModelSerializer):
class Meta:
model = Cart
fields = ['id', 'customer']
class ReceptionSerializer(serializers.ModelSerializer):
cart = CartSerializer(many=True)
class Meta:
model = Reception
fields = ['id', 'customer', 'entry_date', 'payment_status', 'cart']
However, please note that the cart field will become read-only this way.
I want to create a custom object list in the view and pass it to the template. In the template I want to loop over the list and display the information.
My models are
class CustomUser(AbstractUser):
def __str__(self):
return self.email
class Post(models.Model):
author = models.ForeignKey(CustomUser,on_delete=models.CASCADE,)
text = models.TextField()
created_date = models.DateTimeField(default=timezone.now)
published_date = models.DateTimeField(blank=True, null=True)
post_url = models.URLField(max_length = 200, blank = True)
slug = models.SlugField(unique=True, blank=True)
class subscription(models.Model):
creator = models.ForeignKey(CustomUser,default=None, null=True,on_delete=models.CASCADE,related_name='creator',)
booster = models.ForeignKey(CustomUser,default=None, null=True,on_delete=models.CASCADE,related_name='booster')
sub_value = models.FloatField(blank = True)
sub_id = models.TextField(blank = True)
status = models.BooleanField(default=False)
dateSubscribed = models.DateTimeField(default=timezone.now)
dateSubscriptionEnded = models.DateTimeField(default=timezone.now)
paymentCount = models.FloatField(default= 0)
I want to filter objects from subscription model like below
subs = subscription.objects.filter(booster = request.user)
Then find creators in the above subs object list and for each creator get the name, numbers Posts, and number of Subscribers. Add this to custom list and pass it to the template to loop over and display the information in the template. Can someone help me how to create this custom list. Thanks!
Ok so here are the basics minus the subscribers because I don't see the relation clearly. This is how to parse the name and the number of posts. \
my_list = []
for sub in subs:
name = sub.creator.name
auth_id = sub.creator.id
posts = Post.objects.filter(author=auth_id)
num_of_posts = len(posts)
my_list.append({
'name':name,
'post_count': num_of_posts,
})
then you would pass mylist thru the template context.
It is a common mistake to name the related_name=… parameter [Django-doc] to the same value as the name of the field. The related_name parameter however is the name of the reverse relation Django will automatically add. So here it means a relation to access for example the related subscription objects of a given CustomUser.
Therefore it makes more sense to rename these, for example like:
class Subscription(models.Model):
creator = models.ForeignKey(
CustomUser,
default=None,
null=True,
on_delete=models.CASCADE,
related_name='created_subscriptions'
)
booster = models.ForeignKey(
CustomUser,
default=None,
null=True,
on_delete=models.CASCADE,
related_name='boosted_subscriptions'
)
sub_value = models.FloatField(blank=True)
sub_id = models.TextField(blank =True)
status = models.BooleanField(default=False)
dateSubscribed = models.DateTimeField(default=timezone.now)
dateSubscriptionEnded = models.DateTimeField(default=timezone.now)
paymentCount = models.FloatField(default=0)
Next we can make a query where:
from django.db.models import Count
CustomUser.objects.filter(
created_subscriptions__booster=request.user
).annotate(
number_of_posts=Count('post', distinct=True)
)
This is a QuerySet of CustomUsers where each CustomUser that arises from this QuerySet has an extra attribute .number_of_posts that contains the number of posts. You thus can iterate over the queryset directly in the template.
I m trying to make a form on the basis of a model. Trouble is that when i create a category via django shell, let's say "Wedding" category, having id=1 and name = "weddings", when i display it in a dropdown(in html form) it shows as Categories object (1) and i would like it to be shown by the name, which is weddings.
As in the documentation i understand that i can attach labels when in the Meta form class but i don't fully understand how i can display dynamically all the category names instead of Categories object 1,2,3,4.
Models.py
class categories(model.Model):
id = models.AutoField(primary_key =True)
name = models.Charfield(max_length = 50)
class Event(models.Model):
id = models.AutoField(primary_key =True)
category = models.ForeignKey(Categories,on_delete=models.SET_NULL,null = True)
owner = models.Charfield(max_length = 50)
Forms.py
class EventForm(forms.ModelForm):
class Meta:
model = Event
fields = ['category','person','owner']
So the actual result when rendering the form is :
Category:(dropdown) - Categories object (1)
Desired result:
Category:(dropdown) - weddings
class categories(model.Model):
id = models.AutoField(primary_key =True)
name = models.Charfield(max_length = 50)
def __str__(self):
return self.name
class Event(models.Model):
id = models.AutoField(primary_key =True)
category = models.ForeignKey(Categories,on_delete=models.SET_NULL,null = True)
owner = models.Charfield(max_length = 50)
def __str__(self):
return self.owner
just add this little magic functions to your model classes.
I have the following models
class STUser(AbstractBaseUser):
email = models.EmailField(unique=True)
name = models.CharField(max_length=255)
companyname = models.CharField(max_length=200, blank=True, null=True)
...
class VenuePermissions(models.Model):
user = models.ForeignKey(STUser, on_delete=models.CASCADE)
venue = models.ForeignKey(Venue, on_delete=models.CASCADE)
signupvaildatestring = models.CharField(max_length=200, blank=True, null=True)
...
I want to grab all the STUser objects and grab all their permissions.
So what I would like is to grab all the VenuePermissions objects. And grab the user and venue object of each venuePermission
Two ways I can do this. use the VenuePermissions_set attribute on STUser but then how do I grab the venue when its just going to be a pk value?
Or focus on the VenuePermissions objects and grab the user and venue from the pk values but how?
I remember nested queries, and I kinda did one in my browse code.
here is an example:
rooms = Room.objects.filter(venue=OuterRef('pk'), sixtyroundseatingoption= True)
venuelist = venuelist.annotate(sixtyrounds=Exists(rooms))
venuelist = venuelist.filter(Q(sixtyrounds = True) | Q(fullbuyoutsixtyroundseatingoption = True))
I've done the set objects in a serializer before
Example serializer:
class RoomAndImageSerializer(serializers.ModelSerializer):
roomimage_set = RoomImageSerializer(many=True, read_only=True)
class Meta:
model = Room
fields = ('pk','name')
any help with this query would be appreciated!
So this is what I am currently trying, I will post an answer if this works:
class VenueUserList(ListAPIView):
serializer_class = VenueUserListSerializer
queryset = VenuePermissions.objects.select_related('user').select_related('venue').filter(signupvaildatestring=None)
class VenueUserListSerializer(serializers.ModelSerializer):
user = UserSerializer()
venue = VenueSerializer()
class Meta:
model = VenuePermissions
fields = ('user', 'venue', 'isvenueviewer', 'isvenueeventplanner', 'isvenueadministrator')
Here is the answer. However I still need to group venues by user. Working on that.
class VenueUserList(ListAPIView):
serializer_class = VenueUserListSerializer
queryset = VenuePermissions.objects.select_related('user').select_related('venue').filter(signupvaildatestring=None)
class VenueUserListSerializer(serializers.ModelSerializer):
user = UserSerializer()
venue = VenueSerializer()
class Meta:
model = VenuePermissions
fields = ('user', 'venue', 'isvenueviewer', 'isvenueeventplanner', 'isvenueadministrator')
i am developing a rest API using django rest framework and i am stuck at a serializer the idea is to serialize a self recursive many to many model using a through table my code is:
model.py:
class Patient(models.Model):
class Meta:
db_table = 'patients'
id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False, unique=True)
id_card = models.CharField(max_length=45)
dob = models.DateField()
gender = EnumChoiceField(enum_class=Gender)
patientscol = models.CharField(max_length=45)
fk_user = models.ForeignKey(Users, related_name='user_patient', on_delete=models.CASCADE)
relative = models.ManyToManyField("self", through='PatientHasRelative')
class PatientHasRelative(models.Model):
class Meta:
db_table = 'patients_has_relatives'
fk_patient = models.ForeignKey(Patient, related_name='patient_has', on_delete=models.CASCADE)
fk_relative_patient = models.ForeignKey(Patient, related_name='patient_relative', on_delete=models.CASCADE)
relationship = EnumChoiceField(enum_class=Relationship)
my serializer.py is:
class PatientSerializer(serializers.ModelSerializer):
class Meta:
model = Patient
fields = ('__all__')
id = serializers.UUIDField(read_only=True)
id_card = serializers.CharField(required=True, max_length=45)
dob = serializers.DateField(required=True)
gender = EnumChoiceField(enum_class=Gender)
fk_user = serializers.PrimaryKeyRelatedField(required=True, queryset=Users.objects.all())
relative = PatientSerializer(read_only=True, required=True)#problem is here i cant use PatientSerializer here
class PatientHasRelativeSerializer(serializers.ModelSerializer):
class Meta:
model = PatientHasRelative
fields = ('__all__')
fk_patient = serializers.PrimaryKeyRelatedField(required=True, queryset=Patient.objects.all())
fk_relative_patient = serializers.PrimaryKeyRelatedField(required=True, queryset=Patient.objects.all())
relationship = EnumChoiceField(enum_class=Relationship)
a little help would be appreciated
To accomplish this you need to define related_name in the source model on the source field ie add
class Patient(models.Model):
relatives = models.ManyToManyField(
"self", through='PatientHasRelative', related_name='patients')
with this related_name you can easily access -- add/delete/set relatives/patients on either side of the relationships in the serializers
You can either do this using intermediary model
relative = Patient(**key_value_fields)
patient = Patient(**key_value_field)
PatientHasRelative.objects.create(
relative=relative, patient=patient, through_defaults=(relationship ='value',))
or you can do this
relative.patients.add(patient, through_defaults=relationship ='value')
or this
patient.relatives.add(relative, through_defaults=relationship ='value')
example retrieving
patient.relatives.all()