How to save a result of multiplication

[jose angel encinas ramos]

Hi everyone i build a web application in Django 3.1.7 and i try to do the 
next opeation(multiplication).

in my models a have:
class Articles(models.Model):
 quantity = models.PositiveIntegerField()
cost_buy = models.DecimalField(max_digits=10, decimal_places=2)
total_todo = models.DecimalField(max_digits=10, decimal_places=3)

@property
def total_valores(self):
 return (self.cost_buy*self.quantity)

def saveit(self):
self.total_todo = self.total_valores
super (Articles, self).save()
__

so, I was tried with this functions , but it's doesn't save anything

would you give me some recomendations.

Thank you very much in advance and I remain at your service regards 

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Try to save multiple files using a one to many fields django

[jose angel encinas ramos]

hello everyone, i working in my inventory django app, in this project i try 
to create a new area and in to each area has a posible to save multiples 
pdf.
so, when i try to save pdf in some new area have this error in terminal

'''
django.db.utils.IntegrityError: null value in column "microbusiness_id" 
violates not-null constraint
DETAIL:  Failing row contains (3, documents/Informe_de_TeleTrabajo.docx, 
2021-02-22 04:25:32.352176+00, 2021-02-22 04:25:32.352206+00, null).

[22/Feb/2021 04:25:32] "POST /add_pdf HTTP/1.1" 500 18705

but its save it and does't show anything 
'''
Model:
'''
class MicroBusiness(models.Model):
#models micro business
name = models.CharField(max_length=50)
img = models.ImageField(upload_to='areas_logo', null=True, blank=True)
comments = models.TextField(blank=True, null=True)

#actions
created = models.DateTimeField(auto_now_add=True)
update = models.DateTimeField(auto_now=True)

class Meta:
verbose_name = 'MicroBusiness'
verbose_name_plural = 'MicroBusinesses'

def __str__(self):
return self.name

class DocumentsPdf(models.Model):
document = models.FileField(upload_to='documents', null=False, blank=False)
microbusiness = models.ForeignKey('MicroBusiness', on_delete=models.CASCADE, 
null=False, blank=False)

#actions
created = models.DateTimeField(auto_now_add=True)
update = models.DateTimeField(auto_now=True)

class Meta:
verbose_name = 'DocumentPdf'
verbose_name_plural = 'DocumentPdfs'

def __str__(self):
return "%s" % self.document
'''
Form:
'''
class DocumentPdfForm(forms.ModelForm):
  #Documents pdf
class Meta():
model = DocumentsPdf
fields = ('document',)
'''
Views:
'''
@permission_required('is_superuser')
@login_required
def AreasViews(request, id):
pdfdoc = DocumentsPdf.objects.all()
try:
data = MicroBusiness.objects.get(id = id)
except MicroBusiness.DoesNotExist:
raise Http404('Data does not exist')
context ={
'pdfdoc': pdfdoc,
'data':data,
}
return render(request,'inventory/organization/Areas.html',context)

@permission_required('is_superuser')
@login_required
def save_pdf(request,form,template_name):
#function save documents
data = dict()
if request.method == 'POST':
if form.is_valid():
""" import pdb
pdb.set_trace() """
form.save()
data['form_is_valid'] = True
pdfdoc = DocumentsPdf.objects.all()
data['areas_mb'] = render_to_string('
inventory/organization/all_documents.html',{'pdfdoc':pdfdoc})
else:
data['form_is_valid'] = False
context = {
'form':form
}
data['html_form'] = render_to_string(template_name,context,request=request)
return JsonResponse(data)

@permission_required('is_superuser')
@login_required
def createpdf(request):
#this function add document 
if request.method == 'POST':
form = DocumentPdfForm(request.POST or None, request.FILES)
else:
form = DocumentPdfForm()
return save_pdf(request,form,'inventory/organization/upload.html')


'''





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Re: multiplying two fields

[jose angel encinas ramos]

tanks Ross, i fixed my error but now only show me this

>>> data = Articles.objects.all().annotate(F=('cost_buy') *
F('quantity')).output_field=FloatField('result')
>>> print(data)

>>>

what do you think?

On Fri, Jan 29, 2021 at 2:54 PM Ross Meredith  wrote:

> Apologies, typo myself!
>
> That meant to say "typo" not "type".
>
>
>
> On Fri, Jan 29, 2021 at 9:52 PM Ross Meredith 
> wrote:
>
>>
>> data = Articles.objects.all().annotate(result=F('coust_buy') * 
>> F('quantity')).output_field=FloatField('result'),
>>
>> contains a type for the field "cost_buy" (i.e. not "coust_by").
>>
>> If that isn't it please give us the traceback.
>>
>> On Fri, Jan 29, 2021 at 8:50 PM jose angel encinas ramos <
>> encinasj.an...@gmail.com> wrote:
>>
>>> Guys gd evening
>>>
>>> I need help,really i don't kwnow how to do a multiply two fields, have a
>>> model called Articles.
>>>
>>> class Articles(models.Model):
>>> #models article
>>> Nuevo = 'Nuevo'
>>> Semi_nuevo = 'Semi_nuevo'
>>> Usado = 'Usado'
>>> Otros = 'Otros'
>>> STATE_ACTUAL = (
>>> (Nuevo, 'Nuevo'),
>>> (Semi_nuevo,'Semi_nuevo'),
>>> (Usado,'Usado'),
>>> (Otros,'Otros')
>>> )
>>> name = models.CharField(max_length=50)
>>> quantity = models.PositiveIntegerField()
>>> fk_brand = models.ForeignKey(Brand, null=True, on_delete=
>>> models.SET_NULL)
>>> model = models.CharField(max_length=50)
>>> fk_category = models.ForeignKey(Category, null=True, 
>>> on_delete=models.SET_NULL)
>>>
>>> cost_buy = models.DecimalField(max_digits=10, decimal_places=2)
>>> fk_supplier = models.ForeignKey(Supplier, null=True, on_delete=
>>> models.SET_NULL)
>>> userful_life = models.DateField()
>>> actual_state = models.CharField(max_length=12, choices=STATE_ACTUAL)
>>> date_check = models.DateField()
>>> location = models.CharField(max_length=50)
>>> img = models.ImageField(upload_to='articles', null=True, blank=True)
>>> description = models.TextField(blank=True)
>>> #actions
>>> created = models.DateTimeField(auto_now_add=True)
>>> update = models.DateTimeField(auto_now=True)
>>>
>>> class Meta:
>>> verbose_name = 'Article'
>>> verbose_name_plural = 'Articles'
>>>
>>> @property
>>> def result(self,*args, **kwargs):
>>> mult = self.cost_buy * self.quantity
>>> return mult
>>>
>>> class Meta:
>>> verbose_name = 'Article'
>>> verbose_name_plural = 'Articles'
>>>
>>> def __str__(self):
>>> return '{} {} {}'.format(self.name ,self.cost_buy, self.quantity)
>>>
>>> so i want to multiply 2 filed , *cost_buy* * *quantity* and the result
>>> show in the template
>>>
>>> i was to try did this query in view.py
>>> data = Articles.objects.all().annotate(result=F('coust_buy') * F(
>>> 'quantity')).output_field=FloatField('result')
>>>
>>>
>>> but isn't work
>>>
>>>
>>>
>>>
>>>
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>>> .
>>>
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>


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Ing. Tecnologias de la información


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multiplying two fields

[jose angel encinas ramos]

Guys gd evening 

I need help,really i don't kwnow how to do a multiply two fields, have a 
model called Articles.

class Articles(models.Model):
#models article
Nuevo = 'Nuevo'
Semi_nuevo = 'Semi_nuevo'
Usado = 'Usado'
Otros = 'Otros'
STATE_ACTUAL = (
(Nuevo, 'Nuevo'),
(Semi_nuevo,'Semi_nuevo'),
(Usado,'Usado'),
(Otros,'Otros')
)
name = models.CharField(max_length=50)
quantity = models.PositiveIntegerField()
fk_brand = models.ForeignKey(Brand, null=True, on_delete=models.SET_NULL)
model = models.CharField(max_length=50)
fk_category = models.ForeignKey(Category, null=True, on_delete=models.SET_NULL) 

cost_buy = models.DecimalField(max_digits=10, decimal_places=2)
fk_supplier = models.ForeignKey(Supplier, null=True, on_delete=
models.SET_NULL)
userful_life = models.DateField()
actual_state = models.CharField(max_length=12, choices=STATE_ACTUAL)
date_check = models.DateField()
location = models.CharField(max_length=50)
img = models.ImageField(upload_to='articles', null=True, blank=True)
description = models.TextField(blank=True)
#actions
created = models.DateTimeField(auto_now_add=True)
update = models.DateTimeField(auto_now=True)

class Meta:
verbose_name = 'Article'
verbose_name_plural = 'Articles'

@property
def result(self,*args, **kwargs):
mult = self.cost_buy * self.quantity
return mult

class Meta:
verbose_name = 'Article'
verbose_name_plural = 'Articles'

def __str__(self):
return '{} {} {}'.format(self.name ,self.cost_buy, self.quantity)

so i want to multiply 2 filed , *cost_buy* * *quantity* and the result show 
in the template 

i was to try did this query in view.py 
data = Articles.objects.all().annotate(result=F('coust_buy') * F('quantity'
)).output_field=FloatField('result')
 

but isn't work





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Re: How can I multiply 2 or more fields in django views or models

[jose angel encinas ramos]

Ok, i understood, can you show me how to multiply 2 fields?
really i can't to do that... i guess i in mental looping

i try to do that in views.py:
data = Articles.objects.all().annotate(result=F('coust_buy') * F('quantity'
)).output_field=FloatField('result')

and the result is this what to you think 😬

On Mon, Jan 4, 2021 at 2:06 PM Ayser shuhaib 
wrote:

> Nothing wrong with the query, the problem is that you are trying to
> multiply two values of a different type.
> You can fix that by converting the smallInteger value to decimal.
>
> On Mon, 04 Jan 2021 at 23:01, jose angel encinas ramos <
> encinasj.an...@gmail.com> wrote:
>
>> Hi everyone, i'm a new in django and python and i have a problem
>>
>> I had a inventory app and I want to multiply 2 fields, coust_buy and
>> quantity, but when execute this query:
>> views.py
>> data = Articles.objects.all().annotate(result=F('coust_buy') * F(
>> 'quantity'))
>>
>> the results is this (img down)
>>
>>
>>
>> what wrong with my query ? b
>>
>>
>> --
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>> .
>>
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>


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Ing. Tecnologias de la información


Cel:  6622267620  <6622267620>

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Re: Django for beginers

[jose angel encinas ramos]

this is the documentation, is very useful

https://docs.djangoproject.com/en/3.0/

https://www.valentinog.com/blog/drf/


El mié., 8 ene. 2020 a las 18:08, KULDEEP SHARMA (<
onshadeeprmaald1...@gmail.com>) escribió:

> How and where can we find the Django doc. And how can we llink Python with
> our reactjs.
>
> --
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> 
> .
>


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Cel:  6622267620  <6622267620>

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Re: good day guys

[jose angel encinas ramos]

Buenas tardes, ya creaste un super usuario en django?,
creo que te hace falta correr python manage.py makemigrations
despues python manage.py migrate

intenta eso

El mié., 4 dic. 2019 a las 17:10, Tosin Ayoola ()
escribió:

> halo guys, i'm working on a school management system that has multi user
> (student and staffs), i've created the model, views and form but i'm
> getting this error which i'm not familiar with. i'll b glad if anyone can
> help out
> below is the view, model, form and the err
>
> #forms
> class StudentSignupForm(UserCreationForm):
> class Meta(UserCreationForm.Meta):
> model = UserRole
> @transaction.atomic
> def save(self):
> user = super().save(commit=False)
> user.is_student = True
> if commit:
> user.save()
> return user
>
> class StaffSignupForm(UserCreationForm):
> class Meta(UserCreationForm.Meta):
> model = UserRole
> @transaction.atomic
> def save(self):
> user = super().save(commit=False)
> user.is_staff = True
> if commit:
> user.save()
> return user
>
>
> #views
> class StudentSignUp(CreateView):
> model = UserRole
> form_class = StudentSignupForm
> template_name = 'register/signup.html'
>
> def get_context_data(self, **kwargs):
> kwargs['user_type'] = 'student'
> return super().get_context_data(**kwargs)
> def student_valid_form(self, student_form):
> user = student_form.save()
> login(self.request, user)
> return redirect('students:student_index')
>
> class StaffSignup(CreateView):
> model = UserRole
> form_class = StaffSignupForm
> template_name = 'register/signup.html'
>
> def get_context_data(self, **kwargs):
> kwargs['user_type'] = 'staff'
> return super().get_context_data(**kwargs)
> def staff_valid_form(self, staff_form):
> user = staff_form.save()
> login(self.request, user)
> return redirect('staff:staff_index')
>
>
>
>
> #models
>
> class UserRole(AbstractUser):
> is_student = models.BooleanField(default=False)
> is_staff = models.BooleanField(default=False)
>
> --
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> 
> .
>


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Cel:  6622267620  <6622267620>

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tengo un problema a la hora de hacer deploying django app to heroku

[jose angel encinas ramos]

mas que nada el poblema que tengo es técnico , el detalle es que cuando 
escribo en la terminal git push heroku master me lanza el siguiente error y 
no entiendo cual es el error.

(webapps) ➜  BuscadorTims git:(master) ✗ git push heroku master
Counting objects: 221, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (203/203), done.
Writing objects: 100% (221/221), 2.02 MiB | 1002.00 KiB/s, done.
Total 221 (delta 60), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -> App not compatible with buildpack: 
https://buildpack-registry.s3.amazonaws.com/buildpacks/heroku/python.tgz
remote:More info: 
https://devcenter.heroku.com/articles/buildpacks#detection-failure
remote: 
remote:  ! Push failed
remote: Verifying deploy...
remote: 
remote: ! Push rejected to entregastim.
remote: 
To https://git.heroku.com/entregastim.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/entregastim.git'

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