Re: `build_association` produces DB-queries

[Frederick Cheung]

On Saturday, July 28, 2012 6:08:48 PM UTC+1, Roman wrote:

Let `User.has_one :profile`. I've always thought that `@user.build_profile` is a cheap thing to do - it's just creating a new object without persisting it. But, in fact, it does 2 queries to the DB: `BEGIN` and `COMMIT`.

I've never seen this before. Is there anything interesting about your profile class ?

Fred

 

In my app I have an admin users#index page where users' details can be edited, and to simplify the code I build a profile whenever it's `nil`, so I get 2 queries for each user, which increases the page load time by a factor. So I'd like to know if this is a bug in Rails worth fixing or that transaction is really necessary when building an association?

Thanks,
Roman