Re: Django-Channels with 2 applications

[Daniel Carvalho]

I've seen the docs already. In fact, 3 people from my team have seen it and 
tried to do what I'm trying to accomplish.
We're at a point where we are either missing something or the Channels is 
not capable of what we need.

Thank you in advance for any help!


segunda-feira, 4 de Novembro de 2019 às 13:47:55 UTC, Integr@te System 
escreveu:
>
> Hi Idea man,
>
> You can acknowlegdes and try it:
>
> https://channels.readthedocs.io/en/latest/
>
>
> On Mon, Nov 4, 2019, 19:11 Daniel Carvalho  > wrote:
>
>> Hello!
>>
>>
>> I'm trying to make an example to test if it is possible to have 2 
>> independent django apps connected to the same channel from django-channels. 
>> So far, I was able to make an example running on one machine and 2 other 
>> machines being able to access the first via a client. But the goal is to be 
>> able to connect separate applications in a single channel to communicate. 
>> Is that possible?
>>
>>
>> *Note*: I'm also using redis, if that helps.
>>
>>
>> Thank you!
>>
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>>  
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>> .
>>
>

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Django-Channels with 2 applications

[Daniel Carvalho]

Hello!


I'm trying to make an example to test if it is possible to have 2 
independent django apps connected to the same channel from django-channels. 
So far, I was able to make an example running on one machine and 2 other 
machines being able to access the first via a client. But the goal is to be 
able to connect separate applications in a single channel to communicate. 
Is that possible?


*Note*: I'm also using redis, if that helps.


Thank you!

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Re: how to raise an error on django admin

[Daniel Carvalho]

I think the way to do is:

from django.contrib import messages

then somewhere...
messages.add_message(request, messages.ERROR, "your error message")

The message will be displayed in the top of the next admin page



On 01/03/2011 09:40 PM, Acorn wrote:
> I'd like to know this too.
> 
> On 3 January 2011 17:25, rahul jain  wrote:
>> Hi,
>>
>> How to display an error in django admin (the error should be displayed in
>> red just like in forms)
>>
>> Something of this form
>>
>> http://groups.google.com/group/django-users/browse_thread/thread/68d4ea1915654134/447ef8473cf86672
>>
>> Thanks.
>>
>> Rahul
>>
>>
>>
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>>
> 




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Re: removable file field and other features

[Daniel Carvalho]

On 12/20/2010 12:55 AM, Daniel Carvalho wrote:
> Everybody knows the default django FileField doesn't allow to remove an
> existing file...
> 
> This is a good replacement. Just use RemovableFileField instead of
> FileField in your models:
> http://djangosnippets.org/snippets/636/
> 
> 
> I want to implement on it another feature- When there is a file being
> uploaded, but the form fails validation for other reason, I want to keep
> the file in the server, so no need to upload the file again. The next
> time the form is submit I would take the file and save it in the model.
> 
> 
> BUT this is not possible because there is (apparently) no way to acess
> the request object inside RemovableFileField nor from the widget...
> 
> SO I think I have to implement this in the ModelForm, or in the
> ModelAdmin, which is a more ugly solution.
> (any ideas???)
> 
> 


If anyone wants to use it, I implemented this solution.

Just use FilesModelAdmin for your models that have file or image fields.

1. A checkbox will be displayed, to remove the current value, if the
field supports blank values.
2. The uploaded files are stored in session variables for later use, in
case the form fails validation you don't need to upload then again.
3. It works for inline models also.

Problem:
if the user is editing two forms at the same time in the same session,
the uploaded files will be mixed...




# coding: utf-8
from django.contrib import admin
from django import forms
from django.utils.safestring import mark_safe

from django.utils.translation import ugettext, ugettext_lazy as _

import django.core.files
import re
import tempfile, shutil

from django.db import models

# if we have a field called "imagem", the associated checkbox for
deleting the file will be "imagem"  + REMOVE_SUFFIX,  "imagem__remove"
REMOVE_SUFFIX = "__remove"

# The session variable name we will use to store the uploaded files
SESSION_NAME = "save_uploaded_files"

import threading

# remember the request value
# so it can be accessed from any place in the thread
def set_current_request(request):
   global local
   local = threading.local()
   local.current_request = request

def get_current_request():
   global local
   return local.current_request


class FileWidget(forms.FileInput):
   # if this file accepts blanks or not
   # This will define if we put a checkbox for removing the file
   blank = False

   def render(self, name, value, attrs=None):

  output = []
  if value:
 # file has a current value

 if hasattr(value, "url"):
# the file value is the value stored in the model
output.append('%s %s %s ' % \
 (ugettext('Currently:'), value.url, value,
ugettext('Change:')))

 else:
# the file value is the file uploaded in the previous
request but not saved yet, because the form validation failed:
output.append('%s %s %s ' % \
 (ugettext('Not saved yet:'), value,
ugettext('Change:')))

 # If it has a current value, and the field accepts blanks,
 # we place a checkbox for removing it
 if self.blank:
request = get_current_request()

name_checkbox = name + REMOVE_SUFFIX

# This is important to remember the checkbox state,
# when the form is submited but fails validation, and is
displayed again
if request and name_checkbox in request.POST.keys():
   checked = 'checked="on"'
else:
   checked = ''

output.append(' %s ' % (name_checkbox, name, checked,
name, ugettext('Remove')))

  output.append(super(FileWidget, self).render(name, value, attrs))

  return mark_safe(u''.join(output))

# The same, but accepts blanks
class FileWidgetBlank(FileWidget):
   blank = True


# This ModelAdmin offers this funtionalities:
# For each file or image field, keeps uploaded files in the server even
if the form fails validation, so they dont need to be uploaded again.
When the form is saved, the uploaded files are also saved to the model.
# Put a checkbox for removing the file, it it accepts blanks.
# This also works for inline models, which have to be FilesStackedInline
class FilesModelAdmin(admin.ModelAdmin):

   def formfield_for_dbfield(self, db_field, **kwargs):
  # is it file or image?
  if type(db_field) in [ models.ImageField, models.FileField]:
 if db_field.blank:
# accept blank?
kwargs['widget'] = FileWidgetBlank
 else:
kwargs['widget'] = FileWidget
  return super(FilesModelAdmin,
self).formfield_for_dbfield(db_field,**kwargs)

   # This function is called before add_view and change_view
   # It saves the uploaded files, and at the same time restores previous
uploaded files.
   def manage_up

removable file field and other features

[Daniel Carvalho]

Everybody knows the default django FileField doesn't allow to remove an
existing file...

This is a good replacement. Just use RemovableFileField instead of
FileField in your models:
http://djangosnippets.org/snippets/636/


I want to implement on it another feature- When there is a file being
uploaded, but the form fails validation for other reason, I want to keep
the file in the server, so no need to upload the file again. The next
time the form is submit I would take the file and save it in the model.


BUT this is not possible because there is (apparently) no way to acess
the request object inside RemovableFileField nor from the widget...

SO I think I have to implement this in the ModelForm, or in the
ModelAdmin, which is a more ugly solution.
(any ideas???)




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form upload field and form validation

[Daniel Carvalho]

hi
I have a form with a file upload field.

If the form fails validation, the user has to give all the file fields
another time.


Someone told me it is possible to avoid that but I can't find more
information...

There was a thread about this before:
http://groups.google.com/group/django-users/browse_thread/thread/c09935490a56256f/ecda5197f7f60654?hl=en=gst=form+upload+remember+field#ecda5197f7f60654
"""
If you search in the archives, I seem to remember some people came up
with ways to pass the filename back in any case for manual display if
you want that, but it still won't be submitted as part of them form.
"""

couldn't find it. Anyone knows?





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Re: doing validation in admin form

[Daniel Carvalho]

On 12/06/2010 04:18 PM, Wayne Smith wrote:
> Then yes, in the clean() method of your Galeria form, you could check the
> number of fotos present and then raise a ValidationError if it is too many,
> along with a custom message for the user.
> 
> Is that what you wish to do?
> 

hi
I think the "clean" method wont solve the problem because at the time it
is called, the inlines from galeria have not been saved yet...


This is what happen when I submit a form with a galeria and two
fotografias. the methods are called in this order:

 1. Galeria.clean - don't know the fotografias yet!

 2. GaleriaAdmin.save_model (before calling super.save_model)

 3. Galeria.save ( before calling super.save)
 4. galeria presave signal
 5. galeria presave signal
 6. galeria postsave signal
 7. galeria postsave signal
 8. Galeria.save ( after calling super.save)

 9. GaleriaAdmin.save_model (after calling super.save_model)

10. Fotografia.save - first foto - only now the fotos are saved...
11. Fotografia.save - second foto


So it seems if someone wants to execute some code after all the form has
been processed, he has to do that somewhere else. [ Maybe in the form
submit view? ]

Anyway if I want to perform a validation there, it is to late.

Maybe the only solution would be to do that in the
GaleriaAdmin.save_model, and have to see the request parameters to know
how many new files have been uploaded...




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Re: doing validation in admin form

[Daniel Carvalho]

On 12/06/2010 03:05 AM, Wayne Smith wrote:
> It's hard to say, because I don't know what kind of "validation" or business
> logic regarding it you are trying to accomplish/employ.
> 


suppose I want a validation like this:

the number of fotos in a galeria should be limited to a number, which
depends on the user that created it (OR, depends on some values that are
in the galeria object)



> However, if you are wanting to ensure you validate a foto during a gallery
> save, why not call an overridden fotos.save() from your custom
> galeria.save()?
> 



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doing validation in admin form

[Daniel Carvalho]

hi

I have this models:


models.py:

class Galeria(models.Model):
...
class Foto(models.Model):
...
galeria = models.ForeignKey(Galeria, null=False)


admin.py:

class FotoInline(admin.StackedInline):
model = Foto
class GaleriaAdmin(admin.ModelAdmin):
inlines = [FotoInline, VideoInline]
admin.site.register(Galeria, GaleriaAdmin)



When a galeria is saved in the django administration, I want to perform
a validation that involves his fotos. ..

They are edited at the same time because I use inline in the admin.


But cannot do that in Galeria.save, nor GaleriaAdmin.save_model, nor in
a postsave event from galeria, because at the time it is called the
fotos have not been saved yet.

Where should I do it the validation?
Have to define a GaleriaForm and do something there?



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list_display with a function

[Daniel Carvalho]

hi

I have a model that defines a function:

class Test(models.Model):
name = models.CharField(max_length=200)

data_expira = models.DateField()

def expired(self):
return self.data_expira < datetime.date.today()

expired.short_description = 'Expirou?'


I want to put it in list_display for this model:
list_display = ["name", "expired"]

BUT
django admin displays it as a text, "True" or "False"...

can I tell django that it is a boolean field?






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no such class TextArea

[Daniel Carvalho]

Hi,

I want to define a form with a multi-line textfield.

from django import forms

class TesteForm(forms.Form):
  field1 = forms.CharField(
max_length=100,widget=forms.widgets.TextInput())
  ...
  field2 = forms.CharField(
widget=forms.widgets.TextArea(attrs={'cols': 40,'rows': 5}))


But it gives the error 'module' object has no attribute 'TextArea'!!

If I do
  pydoc django.forms.widgets.TextArea
and it also says there is no such class TextArea...

what is happening here? I have django 1.2.3 and python 2.6...




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arbitrary ordering in a model

[Daniel Carvalho]

Hi
I have some models where I want objects to be displayed in an arbitrary
order.

For that I have in the model a number field, which is used to sort.
class MyModel:
  ...
  class Meta:
ordering = ["orderfield"]

It would be cool if instead of editing this field, I have a "go up" and
"go down" button in the django administrator, to easily sort the objects.

Anyone know a django app for that?



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