#django

so I can't see how you'd have a view function called 404

that's from the docs

where?

firstly... are you using a dev version of Django?

no

then stop reading the dev docs.

change the 'dev' in that URL to 1.4

I can't see in those docs where it references a view called 404

wtf, I don't remember choosing dev docs

you are telling Django to use the function '404' in the views module in the Project module.

the docs shows : handler404 = 'mysite.views.my_custom_404_view'

what is the correct way to hash and ImageField file.. such that if its updated later that it will use the previous created filename for saving?

xastey: well, you could calculate the hash of it using somethign from the hash module...

sorry I ment is there an param I need to set or method to override that I could apply that logic to

storage backend, probably

you want to include the hash in the filename?

yeah

HWJohn[TFE], first, handler404 has to be defined in your root URLConfs if you want to use your custom 404 view. secondly, your DEBUG has to be false to use the view. third, why don't you just create 404.html template instead of using your custom 404 handler?

say I upload foo.jpg.. I wan it to be hash to sha(timestamp+something else)

and later on use that same hash if that image is updated

in the second upload they would upload bar.jpg

You can specify the storage backend on a per-FileField basis. So you can switch from the default 'append integer' behavior to 'overwrite'

reason being is that I want to preserve the urls for already posted links to the image

ok.. let me check out the storage classes then

thanks a lot.. didn't know were I should make the change

umm actually I see self.field.generate_filename

in FieldFile.. that shoudl work

thanks

eh sources.. bitbucket or github

getting multiple results

alright, got it working

bitbucket.. thanks mattmcc

I don't seem to understand why the error output for syncdb is telling me to add a "related_name" arguement to fix a Model_set issue

how does related_name possible fix these types of clashes

*possibly

Or even worse, why would a clash exist

It's not a type clash it's a name clash.

When you use an M2M or FK, it creates a reverse relationship. By default, the name of that reverse manager is '<model>_set'. Well, more than one of those from a model of the same name means the names clash.

<model> refers to the parent table correct?

Well, the other table. Whether or not it's a 'parent' is up to your schema's semantics.

I'm confused by the term "reverse relationship" that I keep hearing all the time. My understanding of this definition is Table B has a FK to Table A. Reverse Relationship is Table B-> Table A ?

FK or M2M

FunkyBob: Sorry, yes, I ended up writing something manually and doing get_or_create(**dict)... the NULLs in my CSVs from MySQL were causing errors I suppose, and I could set them to None this way

so... were you not calling is_valid() on the forms before?

and a custom clean method could handle the NONE = None

hi, I am just wondering if it's common to use ajax library directly in template eg: put <script src="js/jquery.js"></script> inside the template and use js directly instead of using other app like django-dajax ? Do people do this? thanks.

h6sidhu: Yeah, it's how you find out what models refer back to your model.

Oh! I was calling is_valid, but I got a generic error message and gave up. I didn't know you could write a custom clean method.

h6sidhu: So if Post FKs to Blog, you use the reverse manager to find out, given a blog instance, what posts it has.

oisa: it's worth looking into.. "customising validation" in forms docs

Blog.entry_set.

FunkyBob: thanks

In my Model, I have Table B which has two FK's to Table A. Why would TableA.tableB_set have a clash? I know there are two columns with the same FK but couldn't it just concatenate the tableB_set query?

h6sidhu: Then it'd be misrepresenting the relationships.

h6sidhu: If you're following a relationship between two models in this situation, you usually want to know which FK they're related by.

Not merely that they're related 'somehow'

is there a way to get the previous value of a model field before save besides quering the db?

xastey: I believe it's added in 1.5

or something like that

doh.. guess time to overwrite the the save function :/

time to look at GFK vs. prefetch-related

sorry if my previous question does not make sense. retry my question. By googling, I know there are django apps such as dajax, which will let people use python code for ajax. but is that common not to use app and simply put <script src="/static/js/jquery.js"></script> to template and use <script> $(function()...</script> directly in template? Do people use this direct way? thanks.

"use python code for ajax"?

Django can handle requets made using XHR (most common AJAX method)

but the AJAX is still initiated by JavaScript

FunkyBob, sorry, if that does not make sense. I saw some example of dajax, simply do dajax.alert("Hello World!") in views. I am just wondering if it's OK to use ajax directly in template html file just like normal html file? thanks.

sgo11: careful not to confuse yourself about what happens where

sure, you can put javascript that makes AJAX calls in your templates... but it's not until it is processed by the browser that it "runs"

don't think about it running in your templates... it doesn't, and thinking like that will mess you up in time

I don't know what dajax does... but it if makes the split between server and client sides less clear, it's BAD

FunkyBob, sorry that I am bit confused. what if I want to use jquery directly without learning another app or another API, are there any tutorials that I can follow? so far, I simply treat the template html as a normal html and insert jquery code directly to the template. thanks.

sgo11: I don't understand why you think putting javascript in the template would be anything special.

sgo11: if it's not {{ }} or {% %} or {# #} .. the template language ignores it

FunkyBob, I don't think that is special. that's why I put it directly to the template. my original question is basically asking whether this is fine (a normal process that people do) or not. does this make sense? thanks.

yes, it's fine

the question really has nothign to do with Django

the reasons for and against it are common to all web sites

FunkyBob, ok. got it. thanks. sorry if my words make you confuse.

more that I'm worried you are confused.

this is painful... displaying 24 products can result in 3420 DB hits

but once the caches are warm, it's down to 108

Moar caching!

more prefetch_relatd :)

but, yeah... most of it's discounts...

no idea if it works with InheritanceManager though :/

really wish i'd moved that over to Polymorphic...

Can you alter DEFAULT_DB_ALIAS at runtime or is database routing really the way to go?

what are you hoping to achieve?

FunkyBob syncdb seems to ignore the --database flag when a lot of the default apps go to populate default values. I'm trying to force a bit of obedience into it

That's really what routers are there for.

mattmcc: yeah figured as much just wasn't sure if there was a -easier- way.. trying to find root reason in django to submit a patch too

The saved datetime is displayed correctly ONLY in Django admin as configured in settings.py. But in the shell or in Python codes like view it's retrieved as UTC.

did you mark the field as timezone aware?

FunkyBob, No, how can I do it?