Order_by not working in FloatField type Django
models.py
class CourseCategory(models.Model):
category = models.CharField(max_length=100, unique=True, null=False)
description = models.TextField(blank=True)
class Meta(object):
app_label = "course_category"
def __unicode__(self):
return self.category
Coursetrack Model
class CourseTrack(models.Model):
category = models.ForeignKey(CourseCategory)
course_id = CourseKeyField(max_length=255, db_index=True)
tracks = models.FloatField(null=True, blank=True, default=None)
active = models.BooleanField(default=True)
class Meta(object):
app_label = "course_category"
def __unicode__(self):
return str(self.course_id)
TopCoursesCategory
class TopCoursesCategory(models.Model):
category = models.ForeignKey(CourseCategory)
class Meta(object):
app_label = "course_category"
def __unicode__(self):
return str(self.category)
I added here order_by(), as you can see but its not working.
view.py
def get_popular_courses_ids():
popular_category_id = CourseCategory.objects.filter(category='Popular')
popular_courses_ids = CourseTrack.objects.values('course_id').filter(category=popular_category_id).order_by('tracks')
course_id_list = []
for course_id in popular_courses_ids:
course_id_list.append(course_id['course_id'])
return course_id_list
I think the query you have posted is wrong.
You have used the following lines.
popular_category_id = CourseCategory.objects.filter(category='Popular')
popular_courses_ids = CourseTrack.objects.values('course_id').filter(category=popular_category_id).order_by('tracks')
In the first line, you have used filter and you have used the resulting variable as category= in your second query which you cannot do. For category= in your second query to work, you would need to give a single element and not a queryset. Replace your filter with get in the first query and it might work fine.
Or
If you think that popular_category_id can have more than one row for the category popular, leave the first query as it is and change your second query to
popular_courses_ids = CourseTrack.objects.values('course_id').filter(category__in=popular_category_id).order_by('tracks')
I have changed category to category__in.
Related
# Here is my models
This is my CustmerBuySell model DB designed.
class CustomerBuySell(models.Model):
customer = models.ForeignKey(CustomerAdd, on_delete=models.CASCADE)
customer_buy_sell_debit = models.DecimalField(max_digits=10, decimal_places=2, default=0.00)
customer_buy_sell_credit = models.DecimalField(max_digits=10, decimal_places=2, default=0.00)
description = models.CharField(max_length=250, blank=True)
date = models.DateField()
sms = models.BooleanField(default=False)
picture = models.ImageField(upload_to='customer_buy_sell_pics', default='images.png')
created_at = models.DateTimeField(auto_now_add=True, blank=True, null=True)
updated_at = models.DateTimeField(auto_now=True, blank=True, null=True)
def __str__(self):
return self.customer.customer_name
class Meta:
verbose_name = "Customer BuySell"
verbose_name_plural = "Customer BuySell"
# Here, is my View.
This is the class-based APIView, which I have used. And try to use the aggregate query in this view.
class DailyCustomerBuySellAPIView(APIView):
def get(self, request):
customer_buy_sell = CustomerBuySell.objects.extra(select={'day': 'date( date )'}).values('day').order_by(
'date__date').annotate(available=Count('date__date'))
serializer = CustomerBuySellSerializer(customer_buy_sell, many=True)
return Response({"customer_buy_sell": serializer.data})
# And, finally here are my Serializers
I have no idea what's the problem! Please help me.
class CustomerBuySellSerializer(serializers.ModelSerializer):
# customer = CustomerAddSerializer()
class Meta:
model = CustomerBuySell
fields = '__all__'
def to_representation(self, instance):
representation = super(CustomerBuySellSerializer, self).to_representation(instance)
if instance.customer is not None:
customer_name = instance.customer.customer_name
previous_due = instance.customer.previous_due
representation['custo`enter code here`mer_name'] = customer_name
representation['previous_due'] = previous_due
return representation
There are many problems with your approach. Let me mention each of them one by one:
First of all remove date__date from your APIVIew
Before:
customer_buy_sell = CustomerBuySell.objects.extra(select={'day': 'date( date )'}).values('day').order_by(
'date__date').annotate(available=Count('date__date'))
Instead, write it as:
from django.db.models.functions import Extract
customer_buy_sell = CustomerBuySell.objects.annotate(day=Extract('date','day')).values('day').order_by('day')
if you need a count of the days then you can try
customer_buy_sell_count = customer_buy_sell.count()
Another thing that you are doing wrong is you pass a dict to serializer as you are already using values that return a dictionary of days and not object of CustomerBuySell so you do not need to pass it to serializer otherwise you have to do it according to your need.
In CustomerBuySellSerializer you are using a model serializer with __all__ while you are passing an extra fields day that is not part of it.
So in short there are so many syntax issues with your Django and Django Rest Framework.Great way to fix such issues is to set with an experience programmer so that he can improve the flow of the code. Later on you can focus on logic.
I suppose it is just a typo: Change date__date to date
I have a model Currency defines below:
class Currency(models.Model):
"""
Currency Model
Defines the attribute of Currency
"""
class Meta:
verbose_name = "Currency"
verbose_name_plural = "Currencies"
ordering = ['Currency_Name']
def __str__(self):
return self.Currency_Name
Currency_Date = models.DateTimeField(auto_now_add=True)
Currency_Date_Update = models.DateTimeField(auto_now=True)
Currency_Name = models.CharField(max_length=3, unique=True)
Is_Secondary_Ccy = models.CharField(max_length=1, choices=Y_N_BOOLEAN)
Primary_Currency = models.ForeignKey('self', on_delete=models.DO_NOTHING, null=True) # to refer to itself
Primary_Factor = models.IntegerField(default=1)
Currency_Name_Reuters = models.CharField(max_length=3)
The model is linked to itself by the column "Primary_Currency"
In my admin (image below) I can see the linked, but if i open the dropdown, the label is not user friendly "Currency object (0) etc..."
Can I have the value "Currency_Name" of the "Primary_Currency" ?
thanks for your help :)
Use __str__() method of model class,
class Currency(models.Model):
...
# your code
def __str__(self):
try:
return self.Primary_Currency.Currency_Name
except AttributeError:
return self.Currency_Name
First of all, please forgive for my newbie questions. I did copy most of the code, and try to understand from Django documents.
Code as below:
models.py
class Order(models.Model):
ORDER_CHOICES = (
('import', 'IMPORT'),
('export', 'EXPORT')
)
storage = models.ForeignKey(Storage, on_delete=models.PROTECT)
order_type = models.CharField(max_length=6, choices=ORDER_CHOICES)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now_add=True)
class Item(models.Model):
def random_barcode():
return str(random.randint(10000000, 99999999))
type = models.ForeignKey(Type, on_delete=models.CASCADE)
order = models.ForeignKey(Order, on_delete=models.CASCADE, null=True)
brand = models.ForeignKey(Brand, on_delete=models.CASCADE)
item_name = models.CharField(max_length=50, help_text='Name of goods, max 50 characters')
barcode = models.CharField(max_length=8, default=random_barcode, unique=True)
production_date = models.DateField()
expired_date = models.DateField()
def __str__(self):
return self.item_type
forms.py
class ItemForm(ModelForm):
class Meta:
model = Item
exclude = ['order',]
fields = ['type', 'brand', 'item_name', 'production_date', 'expired_date']
ItemFormSet = inlineformset_factory(Order, Item, form=ItemForm, extra=1)
views.py
class CreatePO(CreateView):
model = Order
context_object_name = 'orders'
template_name = 'storages/create_po.html'
fields = ['order_type', 'storage',]
*#dun't know how to write below code....*
1st question: how to use inline formset to write the CreatePO view?
2nd question: I need my create PO template as below picture, how to add a "Quantity" field?
This kind of template need Javascript, right? Any alternative solution? I have no knowledge with javascript.
First of all, move the def random_barcode(): before def __str__(self): it looks so ugly formated code.
Then let's have a look in your pic, if you haven't proper experience with Javascript you can use Admin Views from Django, it's much more simple and supported by Django 2.1. Read more if you would like to give permission to everyone in a admin-views page https://docs.djangoproject.com/el/2.1/releases/2.1/#model-view-permission
So quantity will be just added inside Item class
quantity = models.PositiveSmallIntegerField(default=1)
Also for your form, in my opinion, you need modelform_factory, so I suggest to read this one https://docs.djangoproject.com/en/2.1/topics/forms/modelforms/#modelform-factory-function
I can not get a clear answer after two days of searching for what must probably be one of the most common things to do with a DRF:
I have the following model:
class ProcessedStockAmounts(models.Model):
prodName = models.ForeignKey(Productlist, on_delete=models.CASCADE, blank=False, unique=False)
amount = models.CharField(unique=False, max_length=255)
time = models.ForeignKey(StockTakingTimes, on_delete=models.CASCADE, blank=False, unique=False, default=1)
def __str__(self):
return str(self.prodName)
And I am returning a JSON object via my API that looks like this:
[{'prodName': 'SV1', 'amount': '1111111', 'time' : 1}]
When I insert my prodName with a value it has no problem, but obviously my user will not know the prodName ID and only the prod name. So when I try to insert the above I get the following error:
ValueError: Cannot assign "'SV1'": "ProcessedStockAmounts.prodName" must be a "Productlist" instance.
This was the closest I got to an answer and when I do the following it actually inserts:
p = ProcessedStockAmounts(amount='33', prodName = Productlist.objects.get(productid = 'SV1'), time = StockTakingTimes.objects.get(times='06:00'))
p.save()
but giving data this way is obviously defeating the purpose.
My serializer looks like the following:
class TestSerializer(serializers.ModelSerializer):
# time = serializers.SlugRelatedField(read_only=True, slug_field='time')
prodName = serializers.CharField()
# prodName = serializers.SlugRelatedField(read_only=True, slug_field='prodName')
class Meta:
model = ProcessedStockAmounts
fields = ('prodName','amount','time')
With my view:
class InsertMultiProcessedStock(APIView):
def post(self, request, format='json'):
serializer = TestSerializer(data = request.data, many=True)
if serializer.is_valid():
serializer.save()
return Response(serializer.data)
else:
return Response(serializer.errors)
Productlist model:
class Productlist(models.Model):
productid = models.CharField(unique=True, max_length=20) # Field name made lowercase.
proddescription = models.CharField(db_column='prodDescription', max_length=255, blank=True, null=True) # Field name made lowercase.
packaging = models.ForeignKey(Packaging, on_delete=models.CASCADE, blank=True, null=True)
unitweight = models.FloatField(db_column='unitWeight', blank=True, null=True)
def __str__(self):
return self.productid
This would have been easier if you had the related model. But the commented-out slugrelatedfield is the way you should do it, using the actual field name:
prodName = serializers.SlugRelatedField(read_only=False, slug_field='productid')
Your serializer is wrong， You must use relationship serializer.
prodName = ProductlistSerializer(many = False)
But I found Your model defintion is very confusing
I am trying to create a product filter.
I am sending the user choice in URL
if the user select size = L then using request.GET
I am receiving:
{'size': ['L']}
But I want to receive: {'size':{'op':'in','attri':'L'}}
Is this possible?
Please help
my models are
class ProductAttribute(models.Model):
slug = models.SlugField(max_length=50, unique=True)
name = models.CharField(max_length=100)
op = models.CharField(max_length=20,default='in')
class Meta:
ordering = ('slug', )
def __str__(self):
return self.name
def get_formfield_name(self):
return slugify('attribute-%s' % self.slug, allow_unicode=True)
def has_values(self):
return self.values.exists()
class AttributeChoiceValue(models.Model):
name = models.CharField(max_length=100)
slug = models.SlugField(max_length=100)
attribute = models.ForeignKey(
ProductAttribute, related_name='values', on_delete=models.CASCADE)
class Meta:
unique_together = ('name', 'attribute')
def __str__(self):
return self.name
class Product(models.Model):
name = models.CharField(max_length=128)
attributes = HStoreField(default={})
q2 = AttributeChoiceValue.objects.filter(attribute__name='size')
My size filter(filter.py) is:
size = django_filters.ModelMultipleChoiceFilter(queryset=q2.values_list('name', flat=True).distinct(),widget=forms.CheckboxSelectMultiple)
I am currently using the following query to filter my database in views.py
result = Product.objects.all()
for key, value in request.GET:result = result.filter(**{'attributes__{}__in'.format(key): value})
I want to make it
a=request.GET
for key, value in a:
result = result.filter(**{'attributes__{}__{}'.format(key,a['op']): value})
so that if I even use Price range as filter my query filter accordingly will be
attributes__price__range
You can send info to your views via "path converters":
https://docs.djangoproject.com/en/2.0/topics/http/urls/#path-converters
Or using regular expressions:
https://docs.djangoproject.com/en/2.0/topics/http/urls/#using-regular-expressions