Re: How can i Open binary files with Django?

[atleta]

You don't open files with django. You open files with the built-in function 
'open'. Which allows you to specify text or binary mode. See the 
documentation: https://docs.python.org/3.11/library/functions.html#open
On Monday, February 13, 2023 at 9:56:18 PM UTC+1 Lucas Matos wrote:

> I tested so many ways to do it, however a only found how to open text 
> files. Someone can help me?

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Re: Admin foreign key widgets Dont quote Keys that the unicode of the Primary key (value=number) is a special character.

[Dev Femi Badmus]

https://chat.whatsapp.com/IVvrrF9Wq7OHWk5x4XNk9K

On Wed, Feb 8, 2023 at 3:40 PM Oluwayemisi Ismail <
ismailoluwayem...@gmail.com> wrote:

> Hello everyone,
>
> I'm Working on a ticket, "Admin Foreign Key widgets don't quote keys".
> When I reproduce the bug, I realized that the widgets quote characters and
> numbers as the value of the primary key.
>
> The challenge I have is that the widgets don't quote keys with primary key
> value that is a number and the unicode of the number is a special
> character. E.g, let's assume the primary key value is _4000, and I try to
> click on the 'change' icon in the Admin site, I get the error that  ID "@"
> doesn't exist. Perhaps it was deleted?  The unicode of 40 is "@". but when
> I click on the unicode of  4000 without "_" as the prefix, I don't get the
> error. This usually happens when the number's unicode is a special
> character.
>
>  My question is, has anyone ran into this challenge before? Does anyone
> have an idea on how to go about it? below is the attached picture of the
> error, ranging from "PK1-PK3"
>
>
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> 
> .
>

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How can i Open binary files with Django?

[Lucas Matos]

I tested so many ways to do it, however a only found how to open text 
files. Someone can help me?

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[Satyajit Barik]

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Re: django model method

[Jason]

there's alot to not like about the implementation here.  You're effectively 
hiding queries and db hits with those methods, since the naming does not 
give any indication that its a db hit.  So its really easy to forget that, 
and then after a while, you're wondering why your project is so slow and 
executing alot of unnecessary queries

for seen, likes and hotness counts, I'd rather denormalize  and have a 
count field for all those values.  Then either use a post-save signal to 
update the values, or use a recurring background task to regenerate the 
fields on an interval.

On Friday, February 10, 2023 at 9:02:16 AM UTC-5 Gabriel Araya Garcia wrote:

> Allways there is a way to improve the code, but  if that not run, then try 
> with CYTHON
>
> Gabriel Araya Garcia
> GMI - Desarrollo de Sistemas Informáticos
>
>
>
>
> El jue, 9 feb 2023 a las 10:09, Andréas Kühne () 
> escribió:
>
>> Not if you want it to be fast. Python itself is slow - so you should try 
>> to offload most of the computation on the database. So filtering would need 
>> to be done on database fields as well.
>>
>> Otherwise you would need to load all of the rows into memory and then do 
>> the filtering there.
>>
>> If you want to continue along the route you have taken now - you probably 
>> could solve it with annotated queries - something like this:
>>
>> https://stackoverflow.com/questions/1396264/how-to-sort-by-annotated-count-in-a-related-model-in-django
>>
>> Regards,
>>
>> Andréas
>>
>>
>> Den tors 9 feb. 2023 kl 13:21 skrev Chelsea Fan :
>>
>>> understood, is there any way to filter objects by method value?
>>>
>>> On Thu, Feb 9, 2023 at 4:42 PM Andréas Kühne  
>>> wrote:
>>>
 No.

 Ordering works by using the database to order the models. It therefore 
 needs to be a database field - otherwise the database can't order by the 
 field?

 Regards,

 Andréas


 Den tors 9 feb. 2023 kl 12:09 skrev Chelsea Fan >>> >:

> hello guys, Is it possible to use model method value to ordering model 
> objects in meta class?
>
> class Post(models.Model):
> title = models.CharField(max_length=255, verbose_name="ady")
> text = RichTextField(verbose_name="text")
> tagList = models.ManyToManyField(Tag, verbose_name="taglar", 
> related_query_name="tagList")
> image = models.ImageField(upload_to="postImage/", verbose_name=
> "surat")
> seen = models.ManyToManyField(UserId,verbose_name="görülen sany", 
> blank=True, related_name="gorulen")
> like = models.ManyToManyField(UserId,verbose_name="like sany", 
> blank=True)
> share = models.PositiveIntegerField(verbose_name="paýlaşylan sany", 
> null=True, blank=True, default="0")
> createdAt = models.DateTimeField(auto_now_add=True, 
> verbose_name="goşulan 
> güni")
>
> class Meta:
> verbose_name_plural="Makalalar"
> # ordering = ("-createdAt",)
> ordering = ["-hotness",]
>
> def __str__(self):
> return self.title
>
> def likes(self):
> return self.like.count()
>
> likes.short_description = "Like sany"
> likes.allow_tags = True
>
> def seens(self):
> return self.seen.count()
>
> seens.short_description = "Görülen sany"
> seens.allow_tags = True
>
> @property
> def hotness(self):
> return self.likes() + self.seens() + self.share
>
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>  
> 
> .
>
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 .

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Facing error while working on my project(google oauth2.0 logins)

[bloomlync monisha]

Watching for file changes with StatReloader
Exception in thread django-main-thread:
Traceback (most recent call last):
  File 
"C:\Users\bloom\AppData\Local\Programs\Python\Python311\Lib\threading.py", 
line 1038, in _bootstrap_inner
self.run()
  File 
"C:\Users\bloom\AppData\Local\Programs\Python\Python311\Lib\threading.py", 
line 975, in run
self._target(*self._args, **self._kwargs)
  File 
"C:\Users\bloom\AppData\Local\Programs\Python\Python311\Lib\site-packages\django\utils\autoreload.py",
 
line 64, in wrapper
fn(*args, **kwargs)
  File 
"C:\Users\bloom\AppData\Local\Programs\Python\Python311\Lib\site-packages\django\core\management\commands\runserver.py",
 
line 125, in inner_run
autoreload.raise_last_exception()
  File 
"C:\Users\bloom\AppData\Local\Programs\Python\Python311\Lib\site-packages\django\utils\autoreload.py",
 
line 87, in raise_last_exception
raise _exception[1]
  File 
"C:\Users\bloom\AppData\Local\Programs\Python\Python311\Lib\site-packages\django\core\management\__init__.py",
 
line 398, in execute
autoreload.check_errors(django.setup)()
  File 
"C:\Users\bloom\AppData\Local\Programs\Python\Python311\Lib\site-packages\django\utils\autoreload.py",
 
line 64, in wrapper
fn(*args, **kwargs)
  File 
"C:\Users\bloom\AppData\Local\Programs\Python\Python311\Lib\site-packages\django\core\management\commands\runserver.py",
 
line 125, in inner_r
un
autoreload.raise_last_exception()  File 
"C:\Users\bloom\AppData\Local\Programs\Python\Python311\Lib\site-pa
ckages\django\utils\autoreload.py", line 87, in raise_last_exception
raise _exception[1]
  File 
"C:\Users\bloom\AppData\Local\Programs\Python\Python311\Lib\site-packages\django\core\management\__init__.py",
 
line 398, in execute
autoreload.check_errors(django.setup)()
  File "C:\Users\bloom\AppData\Local\Programs\Python\Python311\Lib\site-pa
ckages\django\utils\autoreload.py", line 64, in wrapperfn(*args, 
**kwargs)
  File "C:\Users\bloom\AppData\Local\Programs\Python\Python311\Lib\site-pa
ckages\django\__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
  File "C:\Users\bloom\AppData\Local\Programs\Python\Python311\Lib\site-pa
ckages\django\apps\registry.py", line 91, in populateapp_config = 
AppConfig.create(entry)
 ^^^
  File "C:\Users\bloom\AppData\Local\Programs\Python\Python311\Lib\site-pa
ckages\django\apps\config.py", line 123, in create
mod = import_module(mod_path)  ^^^
  File 
"C:\Users\bloom\AppData\Local\Programs\Python\Python311\Lib\importlib\__init__.py",
 
line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
   
  File "", line 1206, in _gcd_import
  File "", line 1178, in _find_and_load
  File "", line 1149, in _find_and_load_unloc
ked
  File "", line 690, in _load_unlocked
  File "", line 936, in exec_module
  File "", line 1074, in get_code
  File "", line 1004, in source_to_c
ode
  File "", line 241, in _call_with_frames_rem
oved
ValueError: source code string cannot contain null bytes

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Re: TabularInlineAdmin queries waaaaaayyyyyy too much.

[Chetan Ganji]

Try them and see if it helps!

https://betterprogramming.pub/django-select-related-and-prefetch-related-f23043fd635d

Regards,
Chetan Ganji
+91-900-483-4183
ganji.che...@gmail.com
http://ryucoder.in


On Thu, Feb 2, 2023 at 8:53 PM Mark Jones  wrote:

> I have an admin with 1 row in the tabular inline.  I have a custom
> queryset in
>
> class ExtensionTabularInlineFormSet(BaseInlineFormSet):
> def get_queryset(self) -> QuerySet[Extension]:
> qs = super().get_queryset()
>
> This gets called 20 times to display that one row.  When you have more
> rows, it gets called 20 times/row.
>
> The culprit is calls to this method:
> def initial_form_count(self):
> """Return the number of forms that are required in this FormSet."""
> if not self.is_bound:
> return len(self.get_queryset())
> return super().initial_form_count()
>
> The solution would be to cache this value, but admin views seem like
> singletons way too often for this to work.  Anyone else seen this?
>
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> 
> .
>

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