Re: How to concatenate a list of Q objects?

[Степан Дибров]

from django.db.models import Q
import operator

qs = SomeModel.objects.all()

# use reduce
rules = []
for rule_key, rule_value in calculated_rules:
rules.append(Q(rule_key=rule_value))

if rules:
qs = qs.filter(reduce(operator.or_, rules))

# not use it
q_collect = None
for rule_key, rule_value in calculated_rules:
new_q = Q(rule_key=rule_value)
if q_collect is None:
q_collect = new_q
else:
q_collect = q_collect | new_q

if rules:
qs = qs.filter(q_collect)

вторник, 6 апреля 2010 г., 9:10:08 UTC+4 пользователь Daniel написал:
>
> Hi, I think that this must be super easy, but I'm kind of stumped.
>
> I have a list qObjects = [qObject1, qObject2, qObject3]
> What I'd like is to form this query:  Sample.objects.filter(qObject1,
> qObject2, qObject3)
>
> How would I accomplish what I need?  Thanks!
>
>

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Re: Model field's verbose_name from database?

[Степан Дибров]

from django.utils.functional import lazy

def field_verbose_db(field_name):
from app.models import FieldNamesMap
return FieldNamesMap.objects.get(key=field_name).title

field_verbose_db_lazy = lazy(field_name, unicode)

first_name = models.CharField(..., 
verbose_name=field_verbose_db_lazy('first_name')) 

вторник, 4 февраля 2014 г., 22:03:08 UTC+4 пользователь Jon Dufresne 
написал:
>
> Hi, 
>
> I have a model with fields that allows the user to modify the 
> user-facing names of these fields. Think "first name", "last name", 
> "email", the user may prefer these be displayed as "given name", 
> "surname", "email address". This is configured exactly once throughout 
> the system. So in this example *all* instances of "first name" should 
> instead be displayed as "given name". Is it possible have a model 
> where "verbose_name" is not a static string, but instead comes from 
> the database? Perhaps with some lazy loading trickery? I want to do 
> something in the spirit of: 
>
> first_name = models.CharField(..., verbose_name=lazy_load_name_from_db()) 
>
> My hope is to eliminate the need to think about what to call this 
> field when displayed to the user. 
>
> Thanks, 
> Jon 
>

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