如何使用Django ValuesQuerySet获取相关对象？

Question

I'm new in django and a simple query blocks me..

So, here is a slice of my model:

class History(models.Model):
    timestamp = models.DateTimeField(auto_now_add=True)
    name      = models.CharField(max_length=200)
    user      = models.ForeignKey(User)
    state     = models.ForeignKey(Status)
    reason    = models.TextField()
    gpgkey    = models.ForeignKey(Key)

def __unicode__(self):
    return self.name

class Key(models.Model):
    gpgkey     = models.CharField(max_length=128)
    gpgid       = models.CharField(max_length=32)
    path        = models.CharField(max_length=200)

    def __unicode__(self):
        return self.gpgkey

this query History.objects.filter(pk=1).values() returns:

[{'user_id': 1, 'name': u'test-4.30-6', 'timestamp': datetime.datetime(2015, 1, 1, 20, 2, 0, 578794, tzinfo=<UTC>), 'gpgkey_id': 1, 'reason': u'blablabla', 'state_id': 2, u'id': 1}]

Target is, that for ex. gpgkey_id is gpgkey : { gpgkey : "test", gpgid : "06B7FFF" } and so on for all the other related objects. How can i do that?

I use values(), because I want the Fields and not the whole model.

Answer 1

you have to ask for them in the values method parameters, and unfortunately I think you must specify also the default you want for you starting model:

History.objects.filter(pk=1).values('gpgkey__gpgkey', 'gpgkey__gpgid', 'gpgkey__path', 'timestamp', 'name', 'user', 'state', 'reason')

if you have a long list of attributes something better can be made traversing the _meta.fields attribute of your model and building that parameter list from there, but the base idea is the previous one.