Re: [DJANGO-TUTORIAL]

[David Nugent]

For interactive web pages, you are (almost) necessarily talking about
javascript.

Given your background and what you're most likely to be doing next, I would
suggest looking at D3.js - Data-Driven Documents (d3js.org)
. It is a somewhat large but very mature library for
visual representation and has a strong following in scientific applications
and is a good investment of your time to learn.

Regards, David

On Sat, Oct 9, 2021 at 1:17 AM Chakresh Singh <
chakresh.si...@alumni.iitgn.ac.in> wrote:

> Dear All,
> I am beginning my first task on Django. I come from a physics background
> and am a novice in web development.
> My aim is to develop an interactive web-page where users see some keywords
> and can choose a pair, which then connects them with a line.
> I should be able to record these pairs and make a graph out of it. This is
> basically to teach freshers about network growth mechanisms.
>
> Any suggestions and help on this would be highly appreciated.
>
> Regards
> Chakresh
> post-doc CRI-Paris
>
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> 
> .
>

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Re:

[Sebastian Jung]

Hello,

Your app tries to insert a new entry in table auth.users. in this table a
User exists with id=2 and you get this constraint error. Please truncate
auth.users table and try it again.

Regards

ola neat  schrieb am Fr., 8. Okt. 2021, 18:12:

> Hello guys
> I've got this issue i don't understand, before i deployed my  APIS to
> heroku everything was working perfectly, but now that i deployed I'm
> getting this error, pls can anyone help me?
>
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> 
> .
>

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Re: DateTime widget in default CreateView form

[Anil Felipe Duggirala]

On Fri, Oct 8, 2021, at 10:57 AM, Iyanuoluwa Loko wrote:
> The date-time has to accept a date, and if you input the date in the 
> textbox in the accepted django format, it will work fine. To have the 
> calendar icon, it is a widget, and you ycan call it by editing the HTML 
> input type, or adding the widget to the views.py

Thanks very much for that clarification Iyanuoluwa. Could you tell me how 
exactly I would add that 'Calendar' widget to my views.py (or my forms.py?)?

thank you.

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Re: DateTime widget in default CreateView form

[Iyanuoluwa Loko]

The choice is not a widget per se. The date-time in the model will accept a
date time input, however, the calendar icon is a widget, and doesn't come
automatically.
The date-time has to accept a date, and if you input the date in the
textbox in the accepted django format, it will work fine. To have the
calendar icon, it is a widget, and you ycan call it by editing the HTML
input type, or adding the widget to the views.py

On Fri, 8 Oct 2021, 16:49 Anil Felipe Duggirala, 
wrote:

> On Fri, Oct 8, 2021, at 8:41 AM, MR INDIA wrote:
> > Answer to this query on stack overflow
> > <
> https://stackoverflow.com/questions/27321692/override-a-django-generic-class-based-view-widget
> >
> > Raw link:
> >
> https://stackoverflow.com/questions/27321692/override-a-django-generic-class-based-view-widget
> > Hope this helps,
>
> Thanks very much for the link MR INDIA.
> That is exactly what Im looking to do, however, its not working for me for
> some reason.
> How can I check if I am getting the desired result in my rendered HTML?
> I am working with a DateTimeField. So I should be getting a
> type='datetime' in the  tag correct?
>
> I don't understand why other fields like a CharField with choices,
> automatically, renders a  tag on my form, without even specifying a
> widget for it as described in the link. Is it not expected that a
> DateTimeField would render the type:'datetime' in the html form? (without
> any additional modifications). The link above was created 6 years ago, has
> this not changed in all that time?
>
> I will show you what I have:
>
> --models.py--
> class Lesson(models.Model):
> ...
> time = models.DateTimeField("Fecha y Hora")
>
> --views.py--
> class LessonCreateView(CreateView):
> model = Lesson
> template_name = 'new_lesson.html'
> form_class = LessonForm
>
> def form_valid(self, form):  # new
> form.instance.instructor = self.request.user
> return super().form_valid(form)
>
> --forms.py--
> class LessonForm(forms.ModelForm):
>
> class Meta:
> model = Lesson
> fields = ['title', 'time', 'nivel']
> widgets = {
> 'time': forms.DateTimeInput()
> }
>
> In my rendered HTML I however get a type="text" for the 'time' field.
> Thanks very much for your help.
>
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> .
>

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Re: [DJANGO-TUTORIAL]

[Adebayo Michael]

Firstly, try to have a basic knowledge on HTML and CSS. Before you start
Django.
They are relatively simple to understand.
 Check w3 school for tutorial on them.

On Fri, 8 Oct 2021, 3:17 pm Chakresh Singh, <
chakresh.si...@alumni.iitgn.ac.in> wrote:

> Dear All,
> I am beginning my first task on Django. I come from a physics background
> and am a novice in web development.
> My aim is to develop an interactive web-page where users see some keywords
> and can choose a pair, which then connects them with a line.
> I should be able to record these pairs and make a graph out of it. This is
> basically to teach freshers about network growth mechanisms.
>
> Any suggestions and help on this would be highly appreciated.
>
> Regards
> Chakresh
> post-doc CRI-Paris
>
> --
> You received this message because you are subscribed to the Google Groups
> "Django users" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to django-users+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/django-users/204caf87-5bd9-416f-a0ac-95d30a3e10ban%40googlegroups.com
> 
> .
>

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Re: DateTime widget in default CreateView form

[Anil Felipe Duggirala]

On Fri, Oct 8, 2021, at 8:41 AM, MR INDIA wrote:
> Answer to this query on stack overflow 
> 
> Raw link: 
> https://stackoverflow.com/questions/27321692/override-a-django-generic-class-based-view-widget
> Hope this helps, 

Thanks very much for the link MR INDIA.
That is exactly what Im looking to do, however, its not working for me for some 
reason.
How can I check if I am getting the desired result in my rendered HTML?
I am working with a DateTimeField. So I should be getting a type='datetime' in 
the  tag correct?

I don't understand why other fields like a CharField with choices, 
automatically, renders a  tag on my form, without even specifying a 
widget for it as described in the link. Is it not expected that a DateTimeField 
would render the type:'datetime' in the html form? (without any additional 
modifications). The link above was created 6 years ago, has this not changed in 
all that time?

I will show you what I have:

--models.py--
class Lesson(models.Model):
...
time = models.DateTimeField("Fecha y Hora")

--views.py--
class LessonCreateView(CreateView):
model = Lesson
template_name = 'new_lesson.html'
form_class = LessonForm

def form_valid(self, form):  # new
form.instance.instructor = self.request.user
return super().form_valid(form)

--forms.py--
class LessonForm(forms.ModelForm):

class Meta:
model = Lesson
fields = ['title', 'time', 'nivel']
widgets = {
'time': forms.DateTimeInput()
}

In my rendered HTML I however get a type="text" for the 'time' field.
Thanks very much for your help.

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[DJANGO-TUTORIAL]

[Chakresh Singh]

Dear All, 
I am beginning my first task on Django. I come from a physics background 
and am a novice in web development. 
My aim is to develop an interactive web-page where users see some keywords 
and can choose a pair, which then connects them with a line.
I should be able to record these pairs and make a graph out of it. This is 
basically to teach freshers about network growth mechanisms. 

Any suggestions and help on this would be highly appreciated. 

Regards
Chakresh
post-doc CRI-Paris

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Quick question for web hosting production

[Patrick Luke Astrero]

I want to ask a quick question guys that, is it possible to host 2 apps in 
one cloud service? like for example, angular for the front end and django 
for the backend? and they would use one ip address right but on a different 
port?


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Re: Problem re-rendering ClearableFileInput on validation error

[Jesus Antonio Sv]

Did you find a solution for this?

On Saturday, December 12, 2020 at 1:13:39 AM UTC+9 michael@gmail.com 
wrote:

> Note that if the user decides to upload a new file on step 2, the field 
> will then be re-rendered with the uploaded file object, which also ends up 
> rendering a blank file input. Is there a case where FileField.bound_data() 
> should return anything else than the initial value?
>
>
>
> On Fri, Dec 11, 2020 at 10:36 AM Michael Goffioul  
> wrote:
>
>> When a form containing a ClearableFileInput is re-rendered (e.g. due to 
>> validation error of some other field), and the clear checkbox was checked 
>> on the first submit, the widget is rendered without initial value, as empty 
>> file input.
>>
>> For instance, let's says there's a model with ImageField and all the 
>> form/view mechanics to edit the model. You edit a model instance that has 
>> an uploaded image already:
>> 1. on initial render, the field is rendered with the clear checkbox and 
>> link to existing file
>> 2. submit the form with some invalid data (e.g. there's another field in 
>> the form that does not validate)
>> 3. on re-render, the field is rendered as empty file input, without clear 
>> checkbox and link
>>
>> AFAICS, this is because:
>> - ClearableFileInput.value_from_datadict() returns False
>> - FileField.bound_data() returns False: it only returns initial data if 
>> submitted data is None or FILE_INPUT_CONTRADICTION
>> - BoundField.value() returns False
>> - BoundField.as_widget() renders field with value set to False
>>
>> I find it non-intuitive that the field is re-rendered as blank, as if 
>> there was no initial data. Is this the intended behavior? Or am I missing 
>> something?
>>
>> Michael.
>>
>> -- 
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>>  
>> 
>> .
>>
>

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Re: Send PDF as an email's attachment ( Working with xhtml2pdf library)

[MR INDIA]

Answer to this query on stack overflow 

Raw link: 
https://stackoverflow.com/questions/33218629/attaching-pdfs-to-emails-in-django
Hope this helps, 
A fellow django developer
On Friday, 8 October 2021 at 00:19:36 UTC+5:30 sreebas...@gmail.com wrote:

> Did you solve it? I need a similar solution.
>
> On Saturday, May 1, 2021 at 5:13:21 AM UTC+6 wwran...@gmail.com wrote:
>
>> Hi Dudes, Im working with pisa from xhtml2pdf LIB in order to get a pdf. 
>> That works OK, but i cant figure out how to attach the generated pdf to  an 
>> email  in order to send it . Anyone dealt with this? I would appreciate any 
>> help on this!
>>
>> *View*:
>>
>>   def get(self,request,*args,**kwargs):
>> try:
>>
>> mailServer = 
>> smtplib.SMTP(settings.EMAIL_HOST,settings.EMAIL_PORT)
>> print(mailServer.ehlo())
>> mailServer.starttls()
>> print(mailServer.ehlo())
>>
>> 
>> mailServer.login(settings.EMAIL_HOST_USER,settings.EMAIL_HOST_PASSWORD)
>> print("conectando...")
>> email_to=[]
>> email_to.append("emailto...@gmail.com")
>> subject="ADICRA - Comprobrante de Pago"
>> template= get_template('pagos/invoice.html')
>> context={
>> 'sale': PagosHead.objects.get(pk=self.kwargs['pk']),
>>
>> 'comp': {'name':'ADICRA','ruc':'Av. Directorio Adicra 
>> 101','address':'C.A.B.A.'},
>>
>> 'icon': 
>> '{}{}'.format(settings.STATIC_URL,'core/img/adicrareng.jpg'),
>>
>> 
>> 'equis':'{}{}'.format(settings.STATIC_URL,'pagos/img/x.jpg'),
>> }
>> html=template.render(context)
>> response= HttpResponse(content_type='application/pdf')
>>
>> #response['Content-Disposition']='attachment; 
>> filename="pago.pdf"' #Para Descargar
>>
>> pisaStatus=pisa.CreatePDF(html, 
>> dest=response,link_callback=self.link_callback)
>>
>> mensaje = EmailMessage(subject, body=pdf, 
>> from_email=settings.EMAIL_HOST_USER, to=email_to)
>> print("Acá antes del attach")
>> mensaje.attach('pago.pdf', pisaStatus,'application/pdf')
>> mensaje.content_subtype = "pdf"  
>> mensaje.encoding = 'us-ascii'
>> mensaje.send()
>> #mailServer.sendmail(settings.EMAIL_HOST_USER,
>>  #   email_to,
>>   #  mensaje.as_string())
>> print("Correo enviado correcamente")
>> return response
>> except Exception as e:
>> print(e)
>> return HttpResponse(reverse_lazy('pagos:list'))
>>
>

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Re: DateTime widget in default CreateView form

[MR INDIA]

Answer to this query on stack overflow 

Raw link: 
https://stackoverflow.com/questions/27321692/override-a-django-generic-class-based-view-widget
Hope this helps, 
A fellow django developer
On Friday, 8 October 2021 at 07:44:10 UTC+5:30 Anil Felipe Duggirala wrote:

> On Thu, Oct 7, 2021, at 5:50 PM, sum abiut wrote:
> > You can use modelform.
> >
> > in your form.py you can do something like this
> >
> > # setup date picker start
> > class DateInput(forms.DateInput):
> > input_type = 'date'
> >
> > class Formname(forms.ModelForm):
> > class Meta:
> > model= yourmodel
> > fields = ('datefield')
> > widgets ={'datefield': DateInput() }
>
> Thank you for the quick response Sum. I am still unsure about the usage of 
> ModelForm, do I need to specify somewhere that the CreateView should use 
> the ModelForm I define instead of the default form?
> Where am I supposed to declare the 'class Formname...' ? (Is this supposed 
> to be done in the models.py file or in the forms.py file?) 
> Previously you meant the forms.py file right ? (not 'form.py')
> The fields list is supposed to be in [] and not in () right?
>
> Why doesn't the default form, that is automatically generated from the 
> model when one uses the CreateView class based view , include the correct 
> widgets?
>
> thanks again,
>

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