When you have a FK to park in your comment model, you automatically get a
reference to a list of comments from the park model. E.g:
class Park(models.Model):
#Park fields here, but no explicit relationship to Comment
class Comment(models.Model):
park = models.ForeignKey(Park)
#other comment fields here
def some_view(request, id):
park = Park.objects.get(pk=id)
comments = park.comment_set #this is a queryset of all comments
associated with the part; it may be empty
#etc...
Or in a template:
{% for comment in park.comment_set.all %}
{{ comment.body }}
{% endfor %}
Does that make sense? Here are the official docs for this functionality:
https://docs.djangoproject.com/en/dev/topics/db/queries/#related-objects
_Nik
On May 13, 2012, at 7:03 PM, psychok7 wrote:
> i think you are right :) , i can always get the parks associated comments if
> i query comments model (im used to only doing it the other way around). gonna
> try that out
>
> thanks
>
> On Monday, May 14, 2012 2:57:17 AM UTC+1, jondykeman wrote:
> If all comment have to have a park and user.
>
> I would have a ForeignKey to Park and User in the Comments model, and no
> Foreign key in the Parks model.
>
> As such a comment will always need to be linked to an existing park and user
> object, but a park can be created without needing a comment.
>
> JD
>
> On Sunday, May 13, 2012 7:53:58 PM UTC-6, psychok7 wrote:
> yes, like a park doesn't have to have comments, but all the comments must
> have an associated park and user all the time.
>
> what is the django syntax for me to achieve this?
>
> On Monday, May 14, 2012 2:49:18 AM UTC+1, jondykeman wrote:
> As far as I understand it the ForeignKey will have to be unique=True and
> null=False.
>
> I want to get a better sense of what you are trying to achieve. Is it that
> you want to link comment and park only some of the time?
>
> JD
>
> On Sunday, May 13, 2012 7:41:39 PM UTC-6, psychok7 wrote:
> so i have this 2 models (Comment and Park)
>
> Comment has a foreign key to USER and PARK
>
> PARK has a foreign key to Comment
>
> my question is, isn't there going to be a deadlock if i don't have a comment
> or a park created? i mean , in order to create a Park i need to have a
> comment, and in order to create a comment i need a park and a user.
>
> is there a way for me to fix my problem? like allowing the foreign key to be
> null or something like that?
>
> thanks in advance
>
> --
> You received this message because you are subscribed to the Google Groups
> "Django users" group.
> To view this discussion on the web visit
> https://groups.google.com/d/msg/django-users/-/EyGby9pYGwMJ.
> To post to this group, send email to django-users@googlegroups.com.
> To unsubscribe from this group, send email to
> django-users+unsubscr...@googlegroups.com.
> For more options, visit this group at
> http://groups.google.com/group/django-users?hl=en.
--
You received this message because you are subscribed to the Google Groups
"Django users" group.
To post to this group, send email to django-users@googlegroups.com.
To unsubscribe from this group, send email to
django-users+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/django-users?hl=en.
