Re: Does Model.save() write back all the field values?

It's not a bug; that is by design.

However, it's not perfect, so in 1.5 we added update_fields: https://docs.djangoproject.com/en/1.5/ref/models/instances/#specifying-which-fields-to-save

Jacob

On Wed, Aug 14, 2013 at 7:01 AM, Dong Wang <chinuxwang@gmail.com> wrote:

Hi all,

I'm using Django 1.4.2. Please let me start my question by an example:

books = Book.objects.filter(published=False)

for book in books:

book.published=True

book.save() 

I would think this small snippet of code will only update the "published" field, but actually it write all the cached field values back to the database. 

Is it a bug or designed to be this way?

Thanks

-- 

Dong Wang

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