Break statement in Djnago template

[guptha]

Hi group,
Is there any break statement in Django template like one in java to
break for loop as an element if found .

{% for enqhasparent in enqhasparentobjs %}
 {% ifequal enobj.id enqhasparent.enquiry.id %}
{{enobj.student_name|capfirst}}
 
  {% endifequal %}
{% endfor %}


Thanks
Ganesh

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Problem with Image field saving

[guptha]

Hi group ,
I am getting error like "Key 'fathers_photo' not found in

{{fatherprofileform.as_p}}





Here FatherProfileForm does not represent UserProfile model .In this
case how can the error be rectified ?


Ganesh

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How to lookup tables which has ForeignKey relationship

[guptha]

hi group,

class Parent(models.Model):
user = models.ForeignKey(User,unique=True)
school=models.ForeignKey(School)
def __unicode__(self):
   return self.user.username

class Student(models.Model):
user = models.ForeignKey(User,unique=True)
school=models.ForeignKey(School)
standard=models.ForeignKey(Standard)


class StudentParent(models.Model):
student=models.ForeignKey(Student)
parent = models.ForeignKey(Parent)


In template,with help of student object I tried to retrieve parent
name like

{{studentobj.studentparent__parent}}

but this could not fetch me the result .please correct me.

A simpler way could be to place the parent foreignkey in student
table ,but for learning point of view i need to know why do I couldn't
hook parent name with the above
Thanks
ganesh

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problem with Imageloading

[guptha]

My requirement is  ,user  uploaded  image has to be saved in Database
after a custom validation for size and has to display to user.
In models.py
class Marketplace(models.Model):
title_name=models.CharField(max_length=125)
photo1  = models.ImageField(upload_to= 'img/marketplace/%Y/%m/
%d', null=True, blank=True)
photo2  = models.ImageField(upload_to = 'img/marketplace/%Y/%m/
%d', null=True, blank=True)


In forms.py
   class MarketplaceForm(forms.Form):
   title_name = forms.CharField(max_length=125)
photo1 = forms.ImageField(required=False)
photo2 = forms.ImageField(required=False)


   def clean_photo1(self):
from django.core.files.images import
get_image_dimensions
logo = self.cleaned_data['photo1']
w, h = get_image_dimensions(logo)
if w > 150 or h > 150:
raise forms.ValidationError(u'That logo is
too big. Please resize it so that it is 32x32 pixels or less, although
150x150 pixels is optimal for display purposes.')
   return self.cleaned_data['photo1']


  def save(self):
new_market = Marketplace.objects.create
(title_name=self.cleaned_data['title_name'],
photo1=self.cleaned_data['photo1'],
photo2=self.cleaned_data['photo2'],
return new_market



In views.py

   def postyour_adds(request):
 if request.method=='POST':
 form=MarketplaceForm(request.POST)
 if form.is_valid():
 newmarket=form.save()
 return HttpResponseRedirect("/
thanksfor_post/")
   else:
   form = MarketplaceForm()
   return render_to_response("marketplace/
postyour_add.html", {'form': form})




In postyour_add.html



{% block content %}
 Enter your choice

  
  {{ form.as_p }}
  
  
{% endblock %}



The Error i am getting says photo1 and photo2 are None


Exception Type: TypeError
Exception Value: coercing to Unicode: need string or buffer,
NoneType found



Local vars shows no values is assigned to photo1 and photo2

Any solution please
Gjango


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Re: How to get the value of ForeignKey

[guptha]

thanks for your reply
but i cannot solve my problem i will make my question clear this time


class BankerCategory(models.Model):
name = models.CharField(max_length=125,unique=True)
created_on = models.DateTimeField(auto_now_add=True)





class Banker(models.Model):
name = models.CharField(max_length=125,unique=True)
company_name = models.CharField(max_length=125,unique=True)
bankercategory = models.ForeignKey(BankerCategory)






class Homeloan(models.Model):
LOAN_TYPE_CHOICES = (
('X', 'Fixed'),
('O','FLOATING'),
 )

banker = models.ForeignKey(Banker)
loan_type = models.CharField(max_length=1,
choices=LOAN_TYPE_CHOICES)
loan_desc = models.TextField()

five_year_period_roi = models.FloatField()
five_year_period_emi = models.IntegerField()
isprivate = models.BooleanField()
ispublic = models.BooleanField()




First i need to filter Homeloan based on 'loan_type' i.e.  fixed or
floating
then
i need to display  all the fields of  Homeloan based on
BankerCategory 'name'
Suppose I have BankerCategory name fields as
1.Bank
2.Finance
I need to display


  loan_type:Fixed

Bank
...
..

Finace
...
...




loan_type:Floating

  Bank
...
..

Finace
...
...











On Mar 9, 4:00 pm, Malcolm Tredinnick <malc...@pointy-stick.com>
wrote:
> On Mon, 2009-03-09 at 03:54 -0700, guptha wrote:
> > hi gp,
> > In models.py
>
> >       class BankerCategory(models.Model):
> >               name = models.CharField(max_length=125,unique=True)
>
> >       class Banker(models.Model):
> >                 bankercategory = models.ForeignKey(BankerCategory)
>
> >       class Homeloan(models.Model):
> >                 banker = models.ForeignKey(Banker)
>
> > I need to retrieve 'name' field of 'BankerCategory' with 'Homeloan'
> > object
> >        home=Homeloan.objects.all()
> >     from this 'home' object how can i access value of 'name' field of
> > 'BankerCategory'
>
> Each Homeloan intsance has a "banker" attribute. You just access it to
> refer to the related object. 
> Seehttp://docs.djangoproject.com/en/dev/topics/db/queries/#related-objects
> for all the details.
>
> Regards,
> Malcolm
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How to get the value of ForeignKey

[guptha]

hi gp,
In models.py

  class BankerCategory(models.Model):
  name = models.CharField(max_length=125,unique=True)

  class Banker(models.Model):
bankercategory = models.ForeignKey(BankerCategory)

  class Homeloan(models.Model):
banker = models.ForeignKey(Banker)


I need to retrieve 'name' field of 'BankerCategory' with 'Homeloan'
object
   home=Homeloan.objects.all()
from this 'home' object how can i access value of 'name' field of
'BankerCategory'

Thanks

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Re: how to use post_save signals

[guptha]

hi,
thanks a lot for your clarification i have tried it in
models.py ,overriding parent save method and everything works fine




On Feb 17, 11:56 am, Malcolm Tredinnick 
wrote:
> On Mon, 2009-02-16 at 22:38 -0800, gganesh wrote:
> > hi,
> > i wrote
> > def after_save(sender,instance,created,**kaw):
> >    instance.acct_number ='RBSB' + str(instance.id)
> >    instance.save()
>
> >post_save.connect(after_save,sender=Selector)
>
> > once when i save it gives out error like
> >      "maximum recursion depth exceeded in cmp "Exception
>
> That's not surprising. When you see that error, it's usually a hint that
> you've got an infinite loop (the other possibility is that you're doing
> a really complex computation, but that's relatively rare, particularly
> in web programming), so start looking for what it can be. In this case,
>
> (1) Something calls Selector.save()
> (2) save() finished andpost_savesignal handler is called.
> (3) your signal handler calls Selector.save() again
> (4) save() calls thepost_savesignal handler (again)
> (5) Go back to step 3, repeat forever.
>
> You're going to have to build something into your signal handler to
> detect the loop. One idea might be to add an attribute indicating that
> you are already updating it:
>
>         def after_save(sender,instance,created,**kaw):
>            if hasattr(instance, '_already_saving):
>               del instance._already_saving
>               return
>            instance._already_saving = True
>            instance.acct_number ='RBSB' + str(instance.id)
>            instance.save()
>
> However, in this particular case, it seems like using apost_savesignal
> handler might be overkill. Can you override the Selector.save() method
> instead?
>
> Signals are useful, generally, when you want to do something to multiple
> models. In this case, the behaviour seems very specific to one
> particular model, so just doing it in the model's save method seems more
> sensible.
>
> The one exception to this guideline is if you don't "own" the Selector
> source -- if it's a third-party model -- and so can't modify the save()
> method. In that case, apost_savehandler can be a way to add new
> behaviour. But that's more of a last resort situation.
>
> Regards,
> Malcolm
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how to make a field uneditable in admin site

[guptha]

hi ,
i need to know how to create a non editable field in admin site .I
tried , one like  below

acct_number=models.CharField(max_lenght=100,editable=False)

but it doesn't work
please any other ideas,

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how to use post_save signals

[guptha]

hi ,
In models.py i have
   class Customer(...)
 bill_no=models.CharFeild(...)


All i need to access the field 'bill_no' and assign a value, In
views.py i wrote

 from django.db.models.signals import post_save
 from mypro.myapp import Customer

   def after_save(sender,instance,created,**kaw):
 sender.bill_no='INV'+ str(sender.id)

   post_save.connect(after_save,sender=Customer)

i'm getting an exception as attribute bill_no and id is not found ,so
i checked the db tables ,they are present, I suppose  i misunderstood
the concept .Please help me to find the fault

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