django models: get list of id

问题

How do i get a list of all id/primary key for a table. Say i have this table:

class Blog(models.Model)
  title = models.CharField()
  body = models.CharField()
  author = models.ForeignKey(Author)

assume the field author is an Author object. I want to get all the ids of Blog where author=author

i know i can use

    blogs = Blog.objects.filter(author=author)

and get all the blog objects in a list form, but how do i get the list IDS/PK? Similar to "Select id from Blog where Author=author"

回答1:

You can do this using values_list method.

blogs = Blog.objects.filter(author=author).values_list('id', flat=True)

See more at the django queryset documentation.

回答2:

Blog.objects.filter(author=author).values_list('id', flat=True)

values_list() gives a list of rows, each row a tuple of all of the fields you specify as arguments, in order. If you only pass a single field in as an argument, you can also specify flat=True to get a plain list instead of a list of tuples.

回答3:

Blog.objects.filter(author=author).values_list('pk', flat=True)

Put pk instead id, just for best practices.

来源：https://stackoverflow.com/questions/22124549/django-models-get-list-of-id