django custom manager with filter parameter -

i add custom manager can called template, not affect entire model (e.g. admin views) , listens parameter set in request (user_profile).

the following have far:

models.py:

class currentqueryset(models.query.queryset):     def current(self):             return self.filter(id=1) ## simplified filter test works.. class currentmanager(models.manager):     use_for_related_fields = true     def get_query_set(self):             return currentqueryset(self.model)     def current(self, *args, **kwargs):             return self.get_query_set().current(*args, **kwargs) 

for model b defined:

    objects = currentmanager() 

the template calls:

{% b in a.b_set.current %} 

but try pass parameter filter (in case date stored on user-profile) method not return results.

e.g.:

models.py

class currentqueryset(models.query.queryset):     def current(self,my_date):              return self.filter(valid_from__lte=my_date)  

showa.html

{% b in a.b_set.current(request.user.get_profile.my_date) %} 

instead of passing parameter template, have tried set in view.py

@login_required def showa(request,a_id):     my_date = request.user.get_profile().my_date     = a.objects.get(id=a_id)     t = loader.get_template('myapp/showa.html')     c = requestcontext(request,{'a':a,'my_date':my_date,})     return httpresponse(t.render(c)) 

which part missing (or misunderstanding) here?

thanks

r

edit

here models. mentioned, in example it's simple 1:n relationship, can m:n in other cases.

class a(models.model):     #objects = currentmanager()     = models.charfield(max_length=200)     description = models.textfield(null=true,blank=true)     valid_from = models.datefield('valid from')     valid_to = models.datefield('valid to',null=true,blank=true)     def __unicode__(self):             return self.a  class b(models.model):     #objects = models.manager()     objects = currentmanager()     = models.foreignkey(a)     b = models.charfield(max_length=200)     screenshot = models.manytomanyfield("screenshot",through="screenshottob")     description = models.textfield(null=true,blank=true)     valid_from = models.datefield('valid from')     valid_to = models.datefield('valid to',null=true,blank=true)     def __unicode__(self):             return self.b 

edit-2

the accepted answer works @ least 1 relationship.
in case of more nested data model, method seems not deliver expected results:

models.py

class c(models.model):     objects = currentmanager()     b = models.foreignkey(a)     c = models.charfield(max_length=200)     description = models.textfield(null=true,blank=true)     valid_from = models.datefield('valid from')     valid_to = models.datefield('valid to',null=true,blank=true)     def __unicode__(self):             return self.c 

views.py

@login_required def showa(request,a_id):     = a.objects.get(id=a_id)     my_date = request.user.get_profile().my_date     b_objects = a.b_set.current(my_date)     c_objects = b_objects.c_set.current(my_date)     t = loader.get_template('controltool2/showa.html')     c = requestcontext(request,{'a':a,'b_objects':b_objects,'c_objects':c_objects,})     return httpresponse(t.render(c)) 

this returns error: 'queryset' object has no attribute 'c_set'

i'd simplify it:

class currentmanager(models.manager):     def current(self, my_date):         return super(currentmanager, self).get_query_set().filter(valid_from__lte=my_date)  

and use this:

a = a.objects.get(id=a_id) my_date = request.user.get_profile().my_date b_objects = a.b_set.objects.current(my_date) 

and pass template filtered objects accessing them using this:

{% b in b_objects %} 

hope helps!

edit (by requestor):

i had adjust follows working:

a = a.objects.get(id=a_id) my_date = request.user.get_profile().my_date b_objects = a.b_set.current(my_date) 

this threw error: "'relatedmanager' object has no attribute 'objects'"

a.b_set.objects.current(my_date)