Nothing in Django specifically that I'm aware of (although that's not saying much), but you can probably do something pretty slick with the operator library and attrgetter:
https://docs.python.org/2/library/operator.html#operator.attrgetter It would probably look something like this (untested): # define a function to pull the nested attribute # assume this is in myapp/utils.py def get_item_attr(obj_instance, search_string): dotted_string = search_string.replace('__', '.') instance_attr = operator.attrgetter(dotted_string) instance_attr_value = instance_attr(obj_instance) return item_attr_value # later, in a view, maybe... from myapp.utils import get_item_attr booking_client_name = get_item_attr(trip, 'booking__client__name') Obviously this is naive and you'll need to check for failures at various points and raise some exceptions if attributes can't be found/accessed, but I think this may point you in the right direction. Never tried this on my own so YMMV. Note that you'll incur multiple DB hits using a function like this (for the FK traversals), so be careful if you plan to run such a function several times for a single request. -James On Mon, Mar 2, 2015 at 10:54 AM, Francis Devereux <[email protected]> wrote: > Hi, > > Is there a Django function that takes a model instance and a lookup > string, and returns the value of the related field? > > For example: > > the_function_i_am_looking_for(trip, 'booking__client__name') > > would return the same as: > > trip.booking.client.name > > Thanks, > > Francis > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/django-users. > To view this discussion on the web visit > https://groups.google.com/d/msgid/django-users/FB0F25B1-00B0-4CD5-A62D-B9CE44F189C8%40devrx.org > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/CA%2Be%2BciWP%2BZ9A_D%3DCxrPfgoUVZEtN3FLWe_eQSmpwN7eD9sJrFw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
