When i add aggregate function on my get_context_data it shows the total for all members and not according to there ID. Thank You
ItemListView
class ItemListView(ListView):
model = HBTYItem
template_name = "accounts/modals/nomodal/todo_list.html"
paginate_by = 2
ordering = ['id']
def get_queryset(self):
return HBTYItem.objects.filter(hbty_cust_id=self.kwargs["list_id"])
def get_context_data(self):
context = super().get_context_data()
context['t_sum'] = HBTYItem.objects.aggregate(Sum('price'))
context["hbty_list"] = HBTYList.objects.get(id=self.kwargs["list_id"])
return context
If you have user filed in HBTVItem you can use:
HBTYItem.objects.filter(user=self.request.user).aggregate(Sum('price'))
Or you can apply filter on any field you want it
Related
Thank You, trying to show the created_date field to the front table but i get an error, if i don't filter and use the all() method i am able to populate all the field data, but i would like to populate created_date field of member.I Get KEY ERROR "list_id"
class ListListView(ListView):
model = HBTYList
template_name = "accounts/modals/nomodal/index.html"
paginate_by = 3
def get_queryset(self):
qs = self.model.objects.all().order_by('-id')
p_f = HbtyCustomerListFilter(self.request.GET, queryset=qs)
return p_f.qs
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
context['dc'] = HBTYItem.objects.filter(hbty_cust_id=self.kwargs["list_id"]) #Fix this method to show created_data
context['filter'] = HbtyCustomerListFilter(self.request.GET, queryset=self.get_queryset())
return context
I Have a Invoice system where employee or staff can create invoice and can add multiple product and quantity for the specific customer . as i am using mysql i cant take json data or an array data .so i was taking the quantity and price( after discount and other modificaion) as a string and then when showing or printing the invoice i used regex to find the quantity and price .i added product ids in a manytomay field from where i am getting the product name and selling price. while showing the data on printing page in when i use zip the products are showing as the id of the product so i want to retrive the data the way it is being saved . or could you tell me any way to do it more easier way?
Here is my models.py
class Invoice(models.Model):
customers = models.ForeignKey(Customer, on_delete=models.CASCADE)
products = models.ManyToManyField(Product)
total = models.FloatField()
date = models.DateField(auto_now_add=True)
amounts = models.CharField(max_length=500, default="00")
quantity = models.CharField(max_length=500, blank=True)
def save(self, *args, **kwargs):
if not Invoice.objects.count():
self.id = 20210001
else:
self.id = Invoice.objects.last().id + 1
super(Invoice, self).save(*args, **kwargs)
Here is my views.py of printing page function
def final_billing(request, id=None):
pk = id
obj = Invoice.objects.get(id=pk)
products = obj.products.all()
customer = Customer.objects.get(id=obj.customers.id)
amn = obj.amounts
qt = obj.quantity
list_of_comma = re.findall("[\d+.+\d]+", amn)
amnts = [float(n) for n in list_of_comma]
list_of_quantity = re.findall('[0-9]+', qt)
qty = [int(n) for n in list_of_quantity if n.isdigit()]
products = list(products)
both = zip(products,amnts,qty)
return render(request, 'finalbill.html',{'bills': obj, "due": customer, "both": both})
I want it to be retrieved the product objects in the sequence of it was saved
The query can only be sorted with a specific field, Django cannot guess otherwise, so in your case the best case is to sort your products by the date they were created, for example :
obj.products.all().order_by("created")
This suppose that you have a "created" field that is added each time a product is save in your database.
Another way of doing it is to specify the through option, from the documentation :
you can use the through option to specify the Django model that represents the intermediate table that you want to use.
The most common use for this option is when you want to associate extra data with a many-to-many relationship.
The through table contains an the primary key of the relation, you can use that to retrieve the sequence in which your objects were added.
for example :
from django.db import models
class Person(models.Model):
name = models.CharField(max_length=50)
class Group(models.Model):
name = models.CharField(max_length=128)
members = models.ManyToManyField(
Person,
through='Membership',
through_fields=('group', 'person'),
)
class Membership(models.Model):
group = models.ForeignKey(Group, on_delete=models.CASCADE)
person = models.ForeignKey(Person, on_delete=models.CASCADE)
inviter = models.ForeignKey(
Person,
on_delete=models.CASCADE,
related_name="membership_invites",
)
invite_reason = models.CharField(max_length=64)
Through Field
I'm working on an export resource but I can't figure out how to pass this field from the view as a column in my export.
issues = Student.objects.annotate(Count('issue'))
def view_student(request):
issues = Student.objects.annotate(Count('issue'))
students = Student.objects.filter(school = request.user.school).order_by('year')
return render(request, 'view_student.html', {'students': students,'issues':issues})
This is how I tried it in the resoucrces.py but it shows no result
class ExportStudentsResource(resources.ModelResource):
books = fields.Field(attribute = 'books',column_name='books',widget= ForeignKeyWidget(Student, 'issue_count'))
class Meta:
model = Student
fields = ('student_id','name','year','klass','stream','books')
This field is not from any model so I just thought Student model could be habouring it. How can I make it work
You can override the .get_queryset(…) method [Django-doc] and annotate your Student objects with:
from django.db.models import Count
class ExportStudentsResource(resources.ModelResource):
books = fields.Field(
attribute='books',
column_name='books',
widget= ForeignKeyWidget(Student,'issue_count')
)
issues_count = fields.Field(attribute='issue_count')
def get_queryset(self):
return super().get_queryset().annotate(
issue_count=Count('issue')
)
class Meta:
model = Student
fields = ('student_id','name','year','klass','stream','books')
I have a model with two child tables and one parent table. Here is the sample model classes.
# Stores list of unique category names
class Category(models.Model):
category = models.CharField(max_length=20, unique=True, validators=[MinLengthValidator(limit_value=5)])
name = models.CharField(max_length=20, validators=[MinLengthValidator(limit_value=8)])
# Parent class for the next two child classes
class DailyLog(models.Model):
category = models.ForeignKey(Category, on_delete=models.CASCADE)
name = models.CharField(max_length=100, validators=[MinLengthValidator(limit_value=8)])
code = models.CharField(max_length=4, validators=[MinLengthValidator(limit_value=3)])
suggested_values = models.CharField(max_length=100, null=True, blank=True)
# First child class defines display order for dailylog items
class DailyLogDisplayOrder(models.Model):
category_item = models.ForeignKey(DailyLog, on_delete=models.CASCADE)
display_order = models.PositiveIntegerField()
# Second Child class publishes dailylog on a daily bases
class DailyLogCheckList(models.Model):
daily_task = models.ForeignKey(DailyLog, on_delete=models.CASCADE)
publish_date = models.DateField(auto_now=True)
daily_task = DailyTaskCategoryManager() # Log manager to get records per category
How do I perform a cartesian product query? The last column comes from the first child table Dailylogdisplayorder. Here is the raw sql.
select daily_task_id, checklist.publish_date, disporder.display_order
from dailylogchecklist checklist, compliance_dailylogdisplayorder disporder
where checklist.daily_task_id = disporder.category_item_id and checklist.publish_date='2020-07-12'
I have tried using cursor.execute() method per Django documentation. However, I am not able to figure out how to return results in QuyerySet. And also looking for a better way to combine child columns using QuerySet. The return queryset is assigned to a formset.
class DailyTaskCategoryManager(models.Manager):
def with_displayorder(self, user):
from django.db import connection
dtrange = datetime.today().date()
with connection.cursor() as cursor:
cursor.execute("select daily_task_id, checklist.publish_date, disporder.display_order
from dailylogchecklist checklist, compliance_dailylogdisplayorder disporder
where checklist.daily_task_id = disporder.category_item_id and
checklist.publish_date=%s", [dtrange])
result_list = []
for row in cursor.fetchall():
p = self.model(id=row[0], daily_task_id=row[1], publish_date=row[2])
p.display_order = row[3]
result_list.append(p)
return result_list
I already answered to a similar question, You can use prefetch_related() to get the related child table data. Check this answer
https://stackoverflow.com/a/71571509/9561654
Hi I´m using django with haystack search. I have one model for Events. Thats the model I'm doing the search on. I have a second model to count the hits/views for the Events. I wan't to return the number of hits for every event additional to the search results.
my view:
def event_search(request):
if request.method == 'POST':
query = str(request.POST['search'])
events = SearchQuerySet().auto_query(query).models(Event).order_by('date')
return render_to_response('event_search.html', {"events": events}, context_instance=RequestContext(request))
else:
return render_to_response('event_search.html', context_instance=RequestContext(request))
my models:
class Event(models.Model):
name = models.CharField(max_length = 70)
date = models.DateTimeField()
description = models.TextField()
active = models.BooleanField(default=True, editable=False)
featured = models.BooleanField(default=False)
class EventHitcount(models.Model):
hit = models.ForeignKey(Event)
ip = models.CharField(max_length=40)
session = models.CharField(max_length=40)
created = models.DateTimeField(default=datetime.datetime.now())
By giving the ForeignKey field a related name it can call and count the related objects.
class Foo(models.Model):
fk = models.ForeignKey(Event,related_name='foofk')
some more fields...
In the template:
{{ foo.foofk.count }}