#django

but even I using """ I need escape ?

ask the validator, mate

The-Kid: what's wrong is that I didn't read the docuemntation prior to coming here and asking a question.

toothe: it's a bad habit we'll break you of eventually :)

toothe: It happens to everyone. In some cases you may have read over it but missed something as well.

FunkyBob: But what if I don't want to look for the answers to my questions

ooh... is that a koan?

this is a nice page though, I mustsay.

FunkyBob: I don't follow

btw, it took me like 4-5 weeks to even understand WTF was going on with django.

toothe: Django is a large project and can take a bit of time to get the hang of

toothe: I've given you the "the core of django" cycle description, right?

toothe: Good choice though on moving to class based views.

The-Kid: you know they're slower, right? :)

FunkyBob: I'm aware

:P

FunkyBob: Creating an object is more work then a function

than

also there's all the method calls, creating call contexts, etc.

FunkyBob: I find them easier to read then function views though and that makes up for the extra overhead

_than_

then is a temporal term, like when

than is a comparative term

FunkyBob: Thank you. I'm going to continue to mess that up btw. I will try not to though.

My spelling is not very good :(

well, I hope the then/when mnemonic will help

FunkyBob: It likely will. I hope it does

I should write a collection of them that I've learned/acquired/developed

you should

I'm good with the you, your, you're

and a lot

your, you're, yore ?

their, there, they're?

just remember 're is abbreviation of "are"

then there's "here / there"

I'm aware

FunkyBob: so about that page of tricks ?

heh

I have an item list model with a price field that gets incremented and decremented when users add or remove items

what's the best way to handle scoundrels that try to overflow the max digits

I was thinking of just setting the field to the max value if it exceeds the max value in an overridden save method

If I'm using a model form to display a ForeignKey to a list of user accounts, is there a way to filter for accounts in some group?

lolidunno: your DBMS should limit that ... so do the operation in a transaction and catch the error

okimoyo: specify the queryset for the field?

FunkyBob: Yes, that would do it....?

ah, so just a try/catch in the view then

okimoyo: if you're not declaring the field explicitly, do it in a custom form __init__ self.fields['myfield'].queryset = ....

I'm thinking about making a django backed html5 game

ok

FunkyBob: Do you have to call super if you override __init__ like that?

okimoyo: yes

okimoyo: call it before you do your work

hi.How should I get the model name in overriden admin change template?

Account.objects.all()[0].postcontent.all()[0].content_index is a Integer field, when trying to modify the value of it, doesnt seem to save (stays 0) is it because of how im accessing the field?

brizz: wow, what an expensive operation

brizz: how are you accessing the field? what re you doing, _exactly_, when you try to update it?

use dpaste.de to show code

trying to update from acc model in shell

show code

i am able to edit in admin and it saves..

SHOW THE CODE

Account.objects.all()[0].postcontent.all()[0].content_index = 3

account.objects.all()[0].postcontent.all()[0].save()

so there's your problem

err Account.objects.all()[0].postcontent.all()[0].save()

you're getting an instance, and changing its value.... then getting a _second_ instance, and saving it

and also tried to save acc object after doing postcontent

all up doing _4_ database reads

lol k

one for account[0], one for postcontent[0]... then the same queries again..

and since there's no ordering... you have no idea which account of postcontent you get any time

[unless you have ordering on the model meta]

so what i want to do... is 'postcontent' is apart of a tumblr account

an 'account' is one tumblr account

ever thought of holding onto the value you get? x = Account.objects.all()[0].postcontent.all()[0] ; x.content_index = 3 ; x.save()

well i was doing ...not in shell

please read the topic... don't use pastebin, use dpaste.de

it doesn't matter _where_ you were doing it

accounts = Accounts.objects.all(), then for acc in accounts: .... acc.postcontent.all()[0].content_index += 3

acc.save()

and that wasn't working, so then tried in shell

--point being i was getting at what you said, holding onto the value you get...wouldnt 'acc' be like xin above

again

you're slicing a queryset.... INSTEAD OF HOLDING ONTO THE OBJECT YOU WANT

no... it would be the postcontent...

querysets are not lists

so you get a random postcontent... update it.. then get _another_ random one.. and save that, not the one you edited

post = acc.postcontent.first(); if post: post.content_index += 3 ; post.save()

ahh i thought querysets were lists pointing to the objects

they arent?

no

very not

when you do [0] on it... it does another DB hit

also... since you're not using order_by ... it's likely you get a different one each time

hey guys

(unless, as I said before, you have Meta.ordering defined on the model)

yea im newb to relational dbs...no formal education or anything, messed w/php/mysql years ago. started learning django because i wanted the orm

i get a RuntimeError in DEBUG mode when i try to PUT to a url that doesn't have a slash appended

because Django tries to append a slash and then complains that PUT data wouldn't go through

however this works fine on prod -- why? how come PUT data went through on a redirect?

domino14: I'd more look at why you're generating incorrect urls

Backbone is just generating these URLs that looks like /api/resource/35 or whatever

if y ou're using reverse / {% url %} properly... this problem won't happen

without the trailing slash

then fix backbone

all right

why is the PUT data going through on a redirect?

when django tells you that it can't do that

`Django can't redirect to the slash URL while maintaining %(method)s data.`

but this works on prod

domino14: no idea what's going on in prod

this is a long standing issue with redirect in http

[which I believe is actually fixed in all modern browsers]

so modern browsers have no problem with correctly maintaining PUT/POST data on a redirect?

when the right redirect is used, they shouldn't

this is why there are [now] 3 redirect types

this was on a 301 and data passed through ok

read here about 307 - https://en.wikipedia.org/wiki/List_of_HTTP_stat...

https://httpstatuses.com/ ;)

MarkusH: !

how's your head?