Re: Django database referential problem
Depending on how you want to limit versions in your projects, you could do something with the "limit_choices_to" argument in your ForeignKey. --~--~-~--~~~---~--~~ 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 [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~--~~~~--~~--~--~---
Re: Django database referential problem
Thanks for the reply Yaron. I think I was basically over thinking the
whole thing.
The ManyToMany was a mistake, you were right, as there is another class
that should need manytomany. (each Issue will potentially relate to more
than one ProjectVersion).
The admin still displays all versions, however this shouldn't be a
problem in my application itself as i can use the version_set
Thanks
Gerry
Yaron Buskilla wrote:
> Hi Gerry.
>
> Why do you use the many to many field for version in the project model ?
> I think all you have to do is define the ForiegnKey as you did in the
> ProjectVersion model and it is enough .
> Because every project has many versions. Then you can get the versions
> of a projetc by writing :
>
> p = Project()
> versions = p.version_set()
>
> and there you have versions as a list of all p's versions.
>
> Yaron
>
>
> Gerry Steele wrote:
>
>> I'm having a problem designing my data model. I'm sure there must be
>> an elementary solution but I can't find it.
>>
>> Below i have two models. ProjectVersion and Project. It all kind of
>> works, however the admin "add" section for Project displays all rows
>> for ProjectVersion in that field, instead of all the versions for
>> just that Project. Is there a constraint or something i'm missing?
>>
>> Many Thanks
>> Gerry
>>
>>
>> class ProjectVersion(models.Model):
>> name = models.CharField(maxlength=30)
>> released = models.NullBooleanField()
>> release_date = models.DateField(blank = True, null=True)
>> unnasigned = models.BooleanField()
>> project_for_version = models.ForeignKey("Project")
>>
>> def __str__(self):
>> return self.name
>>
>> class Admin:
>> pass
>>
>> class Project(models.Model):
>> name = models.CharField(maxlength=30)
>> tag = models.CharField(maxlength=5)
>> project_lead = models.ForeignKey(UserProfile)
>> component = models.ForeignKey(ProjectComponent, blank=True,
>> null=True)
>> version = models.ManyToManyField(ProjectVersion, blank=True,
>> null=True)
>>
>> def __str__(self):
>> return self.name
>>
>> class Admin:
>> pass
>>
>>
>>
>>
>
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Re: Django database referential problem
Hi Gerry.
Why do you use the many to many field for version in the project model ?
I think all you have to do is define the ForiegnKey as you did in the
ProjectVersion model and it is enough .
Because every project has many versions. Then you can get the versions
of a projetc by writing :
p = Project()
versions = p.version_set()
and there you have versions as a list of all p's versions.
Yaron
Gerry Steele wrote:
I'm having a problem designing my data model. I'm sure there must be an
elementary solution but I can't find it.
Below i have two models. ProjectVersion and Project. It all kind of works,
however the admin "add" section for Project displays all rows for
ProjectVersion in that field, instead of all the versions for just that
Project. Is there a constraint or something i'm missing?
Many Thanks
Gerry
class ProjectVersion(models.Model):
name = models.CharField(maxlength=30)
released = models.NullBooleanField()
release_date = models.DateField(blank = True, null=True)
unnasigned = models.BooleanField()
project_for_version = models.ForeignKey("Project")
def __str__(self):
return self.name
class Admin:
pass
class Project(models.Model):
name = models.CharField(maxlength=30)
tag = models.CharField(maxlength=5)
project_lead = models.ForeignKey(UserProfile)
component = models.ForeignKey(ProjectComponent, blank=True, null=True)
version = models.ManyToManyField(ProjectVersion, blank=True, null=True)
def __str__(self):
return self.name
class Admin:
pass
smime.p7s
Description: S/MIME Cryptographic Signature
Django database referential problem
I'm having a problem designing my data model. I'm sure there must be an
elementary solution but I can't find it.
Below i have two models. ProjectVersion and Project. It all kind of works,
however the admin "add" section for Project displays all rows for
ProjectVersion in that field, instead of all the versions for just that
Project. Is there a constraint or something i'm missing?
Many Thanks
Gerry
class ProjectVersion(models.Model):
name = models.CharField(maxlength=30)
released = models.NullBooleanField()
release_date = models.DateField(blank = True, null=True)
unnasigned = models.BooleanField()
project_for_version = models.ForeignKey("Project")
def __str__(self):
return self.name
class Admin:
pass
class Project(models.Model):
name = models.CharField(maxlength=30)
tag = models.CharField(maxlength=5)
project_lead = models.ForeignKey(UserProfile)
component = models.ForeignKey(ProjectComponent, blank=True, null=True)
version = models.ManyToManyField(ProjectVersion, blank=True, null=True)
def __str__(self):
return self.name
class Admin:
pass
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