On Wednesday 29 April 2009 03:24:48 am Dennis Schmidt wrote:
> Hi there,
>
> this might be a trivial question but my search within the django
> documentation and google didn't give me any helpful results.
> In Ruby on Rails you can simply do this
>
> x = Model.new({:param_x => 'x', :param_y => 'y'})
>
> where the params are some model fields. The hash you can provide there
> can be created on the fly. How can I do this in django??? I don't know
> which fields I will set at a certain point and for all the fields I
> don't set there I want the model-field's default value to be used. But
> since I can only hardcode which attributes / fields I will assign this
> is not really possible.
>
> But I guess there MUST be a way to this. Only how?
>
> thanks in advance, Dennis
Is this what you want:
Sample Model:
class TestFun(models.Model):
name = models.CharField(max_length=50)
url = models.URLField(blank=True, null=True)
description = models.TextField()
new = models.BooleanField(default=True)
def __unicode__(self):
return "%s" %(self.name)
Shell creating a new object with only the name and description parameters:
In [1]: from testfun.models import TestFun
In [2]: n = TestFun(name="mike", description="Testing is always fun.")
In [3]: n.save()
In [4]: objs = TestFun.objects.get(name__exact="mike")
In [5]: objs.new
Out[5]: True
In [6]: objs.url
In [7]: objs.description
Out[7]: u'Testing is always fun.'
In [8]: objs.name
Out[8]: u'mike'
As you can see, I instiated my model "TestFun" with only the name and
description parameters, then saved it. The new field was set with the
default setting of true, url I didn't have to enter, since it was set
null=True (blank is for forms and allowing this field to be blank during
validation).
I could have easily done TestFun(name="mike", description="Testing is always
fun.", new=False) to use a non default value for the 'new' parameter.
To sum it up models are treated like normal python classes.[1]
there is also two shortcuts, Model.objects.create() which returns a bound
model instance, which is already saved for you [2]
In addition to that there is a Model.objects.get_or_create() which returns a
set of the bound model and a bool for saying if it was created or not.
get_or_create follows create() in the docs, see [2].
Mike
[1]
http://docs.djangoproject.com/en/dev/ref/models/instances/?from=olddocs#creating-objects
[2]
http://docs.djangoproject.com/en/dev/ref/models/querysets/#create-kwargs
--
It is said that the lonely eagle flies to the mountain peaks while the lowly
ant crawls the ground, but cannot the soul of the ant soar as high as the
eagle?
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