On Nov 11, 10:04 am, gerhard.oe...@ogersoft.at wrote:
> Hello
>
> I am new to django and try to use the ModelForm paradigma, but can't get the
> point ;-((
As the documentation says, the point of a modelform is firstly to
validate input from a user and save it to the database, and secondly
to display an HTML form for the user to enter/edit that data.
>
> My example:
>
> models.py:
> class Project(models.Model):
> id = models.AutoField(primary_key=True)
> deletetime = models.DateTimeField()
> name = models.CharField(max_length=50)
> beginDate = models.DateField()
> endDate = models.DateField()
> memo = models.TextField()
>
> Doing:
> project = Project()
> project.save()
> works fine (autofield increased, other fields empty)
>
> forms.py:
> class ProjectForm(ModelForm):
> class Meta:
> model = models.Project
>
<snip>
> - second try to save an existing record with data from request.POST:
> project = Project.objects.get(id=1)
> projectForm = forms.ProjectForm(request.POST, instance=project)
> project = projectForm.save()
> The content of request.POST:
> <QueryDict: {u'endDate': [u''], u'name': [u'Maissau'], u'memo': [u'aaa'],
> u'id':
> [u'1'], u'savebutton': [u'savebutton'], u'beginDate': [u'2009-10-11']}>
> => result: The Project could not be changed because the data didn't validate.
As this states, the data didn't validate: your model doesn't have
blank=True on any of its attributes, so they are all required, but you
don't provide endDate. If you did projectForm.is_valid() and then
looked at projectForm.errors it would probably tell you this.
--
DR.
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