Hello,
I don't know if you've changed names to protect the innocent, but conceptually,
these
models are hard to translate to the real world. This is the opposite of what
object
oriented programming is trying to accomplish and probably why you're having a
hard
time figuring it out and explaining to others.
For example, it makes no sense that a street has a patient number and initials.
Address should be a through model for a ManyToManyField on Building (if we're
talking
buildings, addresses and streets and ignore patients), but then "completed"
isn't a
good way to distinguish between "23 Main Road" and "25 Main Road".
You get the idea...
>From the looks of it, you altered your code (street_pk=patientid should not
>work as
you think, as patient_number is not the pk of Street). If you do that - please
use an
anology that makes sense, possibly using the classics like fruits, books and
pizzatoppings.
On Wednesday 25 January 2017 15:27:00 Richard Hall wrote:
> My problem comes with relating the two lists to each other in my
> template. what I want to do is list the buildings and then, depending
> if the form already exists, display an "edit form" or "create form"
> link:
>
> <div>
> <ul>
> {% for x in address %}
But...You're not listing buildings. You're listing addresses. So all buildings
that come up,
exist.
Figuring out the buildings "owned by" the patient which don't have addresses,
you
should iterate the buildings and inspect the addresses attribute. For ease of
use in
template, one could do this:
class Building(models.Model):
# ....
@property
def has_address_for_patient(self):
return hasattr(self, 'addresses') and \
self.addresses.filter(street__pk=patientid).count() > 0
Remember that Django Template Language strives to keep programming out of the
template, so either do the above in your model or in your view when building
the
context.
--
Melvyn Sopacua
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