I’m sure this is a trivial operation, but I can’t figure out how it’s done.
There’s got to be something smarter than this:
ids = [1, 3, 6, 7, 9]
for id in ids:
MyModel.objects.filter(pk=id)
I’m looking to get them all in one query with something like:
MyModel.objects.filter(pk=[1, 3, 6, 7, 9])
How can I filter a Django query with a list of values?
Answers:
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Method 1
From the Django documentation:
Blog.objects.filter(pk__in=[1, 4, 7])
Method 2
When you have list of items and you want to check the possible values from the list then you can’t use =.
The sql query will be like SELECT * FROM mytable WHERE ids=[1, 3, 6, 7, 9] which is not true. You have to use in operator for this so you query will be like SELECT * FROM mytable WHERE ids in (1, 3, 6, 7, 9) for that Django provide __in operator.
Method 3
From the Django documentation:
Blog.objects.in_bulk([1])
{1: <Blog: Beatles Blog>}
Blog.objects.in_bulk([1, 2])
{1: <Blog: Beatles Blog>, 2: <Blog: Cheddar Talk>}
Blog.objects.in_bulk([])
{}
Blog.objects.in_bulk()
{1: <Blog: Beatles Blog>, 2: <Blog: Cheddar Talk>, 3: <Blog: Django Weblog>}
Blog.objects.in_bulk(['beatles_blog'], field_name='slug')
{'beatles_blog': <Blog: Beatles Blog>}
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