Django, how to use filter to check if string field is contained in parameter

Question

Say, I have a model with a text field:

class SomeModel
    keyword=models.CharField(null=True, max_length=255)

Now, I know how to check if

Answer 1

Here is a solution that will select SomeModel rows whose keyword is any substring of the querystring, not just complete words:

SomeModel.objects\
    .annotate(querystring=Value(querystring, output_field=CharField()))\
    .filter(querystring__icontains=F('keyword'))

See docs for info about annotate, Value expressions and F expressions