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from django.db.models.loading import get_model
from django.db.models.query import QuerySet
from django.db.models.fields import DateTimeField, DateField
from django import template
register = template.Library()
@register.filter
def latest(model_or_obj, num=5):
# load up the model if we were given a string
if isinstance(model_or_obj, basestring):
model_or_obj = get_model(*model_or_obj.split('.'))
# figure out the manager to query
if isinstance(model_or_obj, QuerySet):
manager = model_or_obj
model_or_obj = model_or_obj.model
else:
manager = model_or_obj._default_manager
# get a field to order by, defaulting to the primary key
field_name = model_or_obj._meta.pk.name
for field in model_or_obj._meta.fields:
if isinstance(field, (DateTimeField, DateField)):
field_name = field.name
break
return manager.all().order_by('-%s' % field_name)[:num]
@register.filter
def call_manager(model_or_obj, method):
# load up the model if we were given a string
if isinstance(model_or_obj, basestring):
model_or_obj = get_model(*model_or_obj.split('.'))
# figure out the manager to query
if isinstance(model_or_obj, QuerySet):
manager = model_or_obj
model_or_obj = model_or_obj.model
else:
manager = model_or_obj._default_manager
return getattr(manager, method)()
@register.filter
def strip(value):
"""
Strips a string.
"""
if value:
return value.strip()
return value
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