django,orm,manytomanyfield , Django ManytoMany retireving all objects that fulfill a condition simoultaneously


Django ManytoMany retireving all objects that fulfill a condition simoultaneously

Question:

Tag: django,orm,manytomanyfield

Using the Django models examples on querymaking (https://docs.djangoproject.com/en/1.8/topics/db/queries/):

How can I select all the entries that have ALL of it's author's names starting with R using the filter function?


Answer:

You use the double-underscore syntax, as described further down that page.

Entry.objects.filter(authors__name__startswith='R')

Edit

So what you actually want to do is to exclude all those authors who do not start with R. You could do that with a Q object and the ~ operator:

from django.db.models import Q
Entry.objects.exclude(~Q(authors__name__startswith='R'))

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