django-models Archives

Programming, sql

IT Nursery

How to select a record and update it, with a single queryset in Django?

How do I run an update and select statements on the same queryset rather than having to do two queries: – one to ...

June 3, 2022
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Programming, Python

IT Nursery

Reload django object from database

Is it possible to refresh the state of a django object from database? I mean behavior roughly equivalent to: new_self = self.__class__.objects.get(pk=self.pk) for ...

June 2, 2022
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Programming, Python

IT Nursery

How to pull a random record using Django’s ORM?

I have a model that represents paintings I present on my site. On the main webpage I’d like to show some of them: ...

June 2, 2022
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django, Programming

IT Nursery

How do you serialize a model instance in Django?

There is a lot of documentation on how to serialize a Model QuerySet but how do you just serialize to JSON the fields ...

May 31, 2022
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django, Programming

IT Nursery

How to ‘bulk update’ with Django?

I’d like to update a table with Django – something like this in raw SQL: update tbl_name set name="foo" where name="bar" My first ...

May 29, 2022
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Programming, Python

IT Nursery

How to limit the maximum value of a numeric field in a Django model?

Django has various numeric fields available for use in models, e.g. DecimalField and PositiveIntegerField. Although the former can be restricted to the number ...

May 29, 2022
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Programming, Python

IT Nursery

Django – How to rename a model field using South?

I would like to change a name of specific fields in a model: class Foo(models.Model): name = models.CharField() rel = models.ForeignKey(Bar) should change ...

May 29, 2022
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django, Programming

IT Nursery

In a django model custom save() method, how should you identify a new object?

I want to trigger a special action in the save() method of a Django model object when I’m saving a new record (not ...

May 28, 2022
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Programming, Python

IT Nursery

Automatic creation date for Django model form objects?

What’s the best way to set a creation date for an object automatically, and also a field that will record when the object ...

May 28, 2022
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How to express a One-To-Many relationship in Django?

I’m defining my Django models right now and I realized that there wasn’t a OneToManyField in the model field types. I’m sure there’s ...

May 25, 2022
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