如何使用 Django ORM 增加 Django CharField（包含整数）？

Question

Say I have a model as:

class model(models.Model):
    remark=models.CharField(max_length=25)
    count=models.CharField(max_length=5)

The entity having remark="counter" has count="34". I wish to retrieve entity (having remark="counter") and change its count to "35", ie cast to integer, increment it by 1, cast back to string, update.

Is there any way I can do this using only Django ORM query(using F or something else) and no Python.

Answer 1

If you really, really need to do this, despite all the red flags, F() functions should do the trick. Most databases implicitly convert strings and ints as required, so you can just do this:

Model.objects.filter(...).update(count=F('count')+1)