Comments on: Rails new vs build

By: deepak

deepak — Sun, 09 Oct 2011 12:39:00 +0000

Thank You very much , I was looking for this

By: Wander

Wander — Wed, 27 Jul 2011 01:38:00 +0000

Hello everyone :), i like this post,

Well, i would like to know a litter more about build and know how to control it in the view….

i means, if i do something like this:

5.times {
@article.comments.build
}

in the view will be appears 5 times.

so, my point is, that i would like to take one of them and give to it a position in a table tag

some idea about how can i do it?

By: wxianfeng

wxianfeng — Thu, 05 May 2011 08:34:00 +0000

clean!!!

By: Aji

Aji — Mon, 21 Mar 2011 13:36:00 +0000

good

By: Kevin Monk

Kevin Monk — Mon, 03 Jan 2011 23:34:00 +0000

I must’ve visited this blog post about 5 or more times and this comment makes me laugh every time. It’s funny because it’s true.

By: cuzic4n

cuzic4n — Thu, 11 Mar 2010 02:34:13 +0000

i was wondering why my “comments” validation routines were not going off.. it was because i was using the append “<<"..

so i started searching around for new vs build create rails.. and came across build..

@article.comments << @comment .. will not trigger validation routines.

@c = @article.comments.build
set @c to stuff. and try @c.save or @c.save! you will see that the validation routines in the comment model go off as expected which is what i needed

By: mrbrdo

mrbrdo — Tue, 27 Oct 2009 05:24:15 +0000

I did some further research into new vs. build vs. create in Ruby on Rails, which someone might fight useful.
My observations and code examples can be found in my blog post here: http://blog.mrbrdo.net/2009/10/27/ruby-on-rails-new-vs-create-vs-build/
I also included some comments from this blog post. I hope this information will be useful to someone!

By: Ryan

Ryan — Wed, 29 Jul 2009 21:23:54 +0000

Another big thing is that @article.comments.build doesn’t save the comment until @article is saved. Whereas if you do:

@comment = Comment.new
@article.comments << @comment

@comment is saved right then even if @article later fails validation and is never saved you will still have @comment in the comments table

By: Molte

Molte — Sun, 24 May 2009 14:52:10 +0000

By writing
@comment = @article.comments.new
the foreign key will also be set.

By: Steven

Steven — Wed, 22 Apr 2009 16:13:18 +0000

Thanks – found this with a Google on ‘rails build versus new’