thanks thats exactly wht i needed ;)
On Monday, May 14, 2012 6:58:47 AM UTC+1, Nikolas Stevenson-Molnar wrote:
>
> 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
>>>>>
>>>>
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