Hi. So I have some small models:
class Group(models.Model):
name = models.CharField()
class Meta:
ordering = ('name',)
class Entity(models.Model):
name = models.CharField()
group = models.ForeignKey(Group, null=True)
Now I want to perform a really simple query like this:
SELECT * FROM `app_entity`
WHERE `app_entity`.`name` = 'something'
ORDER_BY `app_entity`.`group_id` ASC;
Note that I really want to order by the field itself with no useless joins
or smth else. So I write smth like that:
Entity.objects.filter(name='something').order_by('group')
and django happily makes this query:
SELECT `app_entity`.`id` FROM `app_entity`
LEFT OUTER JOIN `app_group` ON ( `app_entity`.`group_id` = `app_group`.`id`
)
WHERE `app_entity`.`name` = 'smth'
ORDER BY `app_group`.`name` ASC
According to the docs it uses default Group model ordering and this default
behaviour makes sense.
And I need this ordering to be set (for admin and some other places).
If I don't set ordering param in Group.Meta - I get what I want: explicit
query shown above (1st one).
But as I said I need it. And I just can't get this query easily.
So we have some sort of inconsistant behaviour - I can do the right thing
without ordering param and I can't do it with it.
order_by('group_id') doesn't work and raises FieldError.
For now I'm using extra(order_by=['app_entity.group_id']) or even
order_by('app_entity.group_id') but it's quite ugly and it's still such a
trivial thing that should have a simple and straight ORM solution.
As I think this might be considered as a bug or smth. In django sourses I
found some place where field names lile `group_id` work.
For example, `values_list` method. But this behaviour is marked as a hack
there.
So the first question is whether do I miss smth and it can be done somehow.
And the second, if not, do I need to submit a ticket for this.
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