Re: Multiple managers for reverse-links between subclasses

[Mackenzie Kearl]

On Jan 21, 11:14 am, Aneurin Price  wrote:
> (Apologies for the vague subject; I couldn't think how to summarise this :P)
>
> Hello all,
>
> I have an application where some models are inherited from others, like so:
>    Foo
>   /   \
> Bar  Baz
> Each object has (or may have) a parent object, which is a Foo (it might be a 
> Bar
> or a Baz, or some other subclass, but it's definitely a Foo). I'd like to be
> able to find the children of an object, both overall and by subclass, using
> 'foo_object.children.all()', or 'foo_object.bars.all()' and so on.
>
> Originally I set up parent links in Foo, as something like
> "parent=models.ForeignKey('self', related_name='children')", but when I 
> realised
> that I mostly want to get the children in groups, I changed the way I was 
> doing
> this. Now I have per-class links like "parent=models.ForeignKey('Foo',
> related_name='bars')", etc. This allows me to have the parent/child hierarchy
> that I want, and access the children in the appropriate groups, but it feels
> rathr ugly, and I'd still like an aggregate 'children' set so that I don't 
> have
> to use each set individually (and update every use if I ever add new
> subclasses).
>
> Additionally, I don't know if I'll need this, but I'm interested in how I 
> might
> get a link to 'children_of_same_type', so in Foo it would be an alias to
> 'children', but in Bar it would be an alias to 'bars', etc. I can't just do
> 'children_of_same_type = bars' because 'bars' is autogenerated so hasn't been
> defined yet.
>
> I hope that makes sense, but if not I can come up with a few more examples to
> try to clarify it.
>
> Does anybody have any suggestions as to how I should structure this? Would I 
> be
> best to leave the parent links as they are and define custom Managers for
> 'children' and 'children_of_same_type'? If so, pointers on how to go about 
> this
> would be appreciated.
>
> Thanks,
> Nye

Why don't you instead of subclass Foo just create a foreignkey to Foo
or a OneToOne with foo.

'foo_object.children.all()'
I don't think that this is possible because it contains different
models in the query.

The other option that you could try is a generic relation something
like the way django-tagging works.

I hope this is a help



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How to Model Formset

[Mackenzie Kearl]

The only way to describe  what I am trying to accomplish is through an
example. Here are my models

class B(models.Model):
credits = models.FloatField(,null=True)

class A(models.Model):
b = models.OneToOneField(B)
description = models.TextField()


I want to get a formset of A forms for each item in B.objects.all().
One  requirement is that I only want it to save if they fill in a
description.
The other requirement is that in the form I don't want the user to be
able to change the value of b.

This is the reverse of an inline formset.



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custom form validation in newforms-admin

[Mackenzie Kearl]

I am using newforms admin and need to be able to have a validation
check against multiple fields on the form. I was reading that all you
need to do is to go

form_change = MyCustomForm()

from within your subclass of admin.ModelAdmin

however it seems like this has changed since the post that I read.
Does anyone know how to accomplish this with the most recent svn copy
of newforms-admin?
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Re: custom model field validation

[Mackenzie Kearl]

On Feb 7, 2:53 am, Pigletto <[EMAIL PROTECTED]> wrote:
> On 7 Lut, 09:58, Mackenzie Kearl <[EMAIL PROTECTED]>
> wrote:> I am having trouble finding documentation on how to add custom
> > validation to a custom model field.
>
> > example:
>
> > class PostalField(models.CharField):
> > def __init__(self,*args,**kwargs):
> > kwargs['max_length']= 6
> > super(PostalField, self).__init__(*args, **kwargs)
>
> > def get_internal_type(self):
> > return "CharField"
>
> Seems that you're mixing two types of fields here: fields from
> django.db.models and fields from django.newforms.fields.
> For this kind of validation (with postal code) you should create
> custom newforms field or write custom validator for a form.
> This is described at newforms documentation.
>
> HTH
>
> --
> Maciej Wisniowski

So If I create a newforms field then how do I tell the admin to use
that when building the form in the admin?
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custom model field validation

[Mackenzie Kearl]

I am having trouble finding documentation on how to add custom
validation to a custom model field.

example:

class PostalField(models.CharField):
def __init__(self,*args,**kwargs):
kwargs['max_length']= 6
super(PostalField, self).__init__(*args, **kwargs)

def get_internal_type(self):
return "CharField"

now when I save from the admin with this field it only validates like
a CharField.
How do I fix this to use some function like below.

def validate(self):
pattern = re.compile("([A-Z,a-z][0-9]){3}")
if not pattern.match(value):
raise forms.ValidationError('Not A valid
Postal Code')

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Sitemap Index problems

[Mackenzie Kearl]

Hi I am trying to get a sitemap index generated however I only get
"Exception Type:ValueError
Exception Value:Empty module name"

I am not sure what I am doing wrong.

urls.py
sitemaps = {
'blog':BlogSitemap,
'gallery':GallerySitemap,
}


urlpatterns = patterns('',
(r'^sitemap.xml$', 'django.contrib.sitemaps.views.index',
{'sitemaps': sitemaps}),
(r'^sitemap-(?P.+).xml$',
'django.contrib.sitemaps.views.sitemap', {'sitemaps': sitemaps}),
)


sitemap.py
from django.contrib.sitemaps import Sitemap
from paddlecrazy.blog.models import Post

class BlogSitemap(Sitemap):

def items(self):
return Post.objects.all()

def lastmod(self, obj):
return obj.modified


I can get the sitemap-.xml files just fine however the index
does not work

Thanks Mackenzie


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Re: Count the times a user has logged into the system

[Mackenzie Kearl]

you can just create a profile with a field number of times logged in.
This could be updated in a custom login view that you write.

check out http://www.djangobook.com/en/beta/chapter12/

def login(request):
username = request.POST['username']
password = request.POST['password']
user = auth.authenticate(username=username, password=password)
if user is not None and user.is_active:
# Correct password, and the user is marked "active"
auth.login(request, user)
# Redirect to a success page.
return HttpResponseRedirect("/account/loggedin/")
else:
# Show an error page
return HttpResponseRedirect("/account/invalid/")


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Re: 404 for date-based generic views--Help!

[Mackenzie Kearl]

You should put some template code up as well i know that I recently
could not see posts that existed because
allow_future: defaults to False
http://www.djangoproject.com/documentation/generic_views/#django-views-generic-date-based-archive-day


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