Up vote 2 down vote favorite share g+ share fb share tw.
I have a twisty maze of interrelated Django models, with many-to-many fields describing the relationships. What's the cleanest way to get a list of unique members of a related model from a QuerySet? If I have a Item model with a groups ManyToMany pointing to the Groups model.
If I have a queryset of Items, of 'items', how do I get this: groups = items0.groups.all(). Values_list('name', flat=True) But for the whole set? Do I need to iterate through them all and do set().intersect()?
Python django many-to-many django-queryset link|improve this question asked Jan 28 '11 at 0:38samurailawngnome235110 67% accept rate.
One solution is to use 2 queries. You can use the reverse relationships to query all Groups that an Item in your items points to. Groups = groups.objects.
Filter(item__in=items).distinct(). Values_list('name', flat=True).
Sufficiently elegant. Thanks. – samurailawngnome Jan 28 '11 at 0:59 You may also find it useful to use flat=True as a parameter to values_list, which will return the result as a list of names, rather than a list of tuples of names.
– gorus Jan 30 '11 at 23:01 @gorus -- updated. I'm finding it funny I removed flat from the original post because I got it confused with distinct. – Yuji Tomita Jan 30 '11 at 23:31.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.