How about a class method that takes the to-become-featured project as an
argument? Something like:
class Project < AR:Base
validates_uniqueness_of :featured
def self.make_featured(this_project)
self.update_all("featured = false")
this_project.featured = true
this_project.save!
end
end
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of yaphi
Sent: Thursday, February 19, 2009 4:37 AM
To: Ruby on Rails: Talk
Subject: [Rails] Re: One model active at a time
I've been thinking more about this, and instead of doing a whole new model,
couldn't I do something like this in my Project model?
before_save :set_if_featured
def set_if_featured
articles = Article.find(:first, :conditions => ["featured = ?",
true])
article.featured = false
featured = true
end
On Feb 18, 4:49 pm, Rob Biedenharn <[email protected]>
wrote:
> Well, I don't know if a Project makes itself featured, but that's your
> dilemma.
>
> In any case, it would be something that a controller action calls on
> either a Project instance (@project.feature_me) or the FeaturedProduct
> model (FeaturedProject.is_now(@project)).
>
> Where you might have:
>
> class FeaturedProject
> def self.is_now(a_project)
> fp = find(:first) || new
> fp.project = a_project
> fp.save
> end
> end
>
> -Rob
>
> On Feb 18, 2009, at 4:16 PM, yaphi wrote:
>
>
>
>
>
> > Interesting...So I'd have a method in my Project model that sets the
> > FeaturedProject.
>
> > I'll play with this and see how it goes. Thanks!
>
> > On Feb 18, 2:08 pm, Rob Biedenharn <[email protected]>
> > wrote:
> >> Why not have a:
>
> >> class FeaturedProject < ActiveRecord::Base
> >> belongs_to :project
>
> >> before_create :only_have_one
> >> validates_associated :project
>
> >> def only_have_one
> >> self.class.count < 1
> >> end
> >> end
>
> >> Then you can FeaturedProduct.find(:first) and be sure that there is
> >> only one. No need to mess with the projects when the featured one
> >> changes. However, you might want to do:
>
> >> class Project
> >> after_destroy :clean_up_if_featured
>
> >> def clean_up_if_featured
> >> fp = FeaturedProject.find(:first)
> >> if fp && fp.project_id == self.id
> >> fp.destroy
> >> else
> >> true
> >> end
> >> end
> >> end
>
> >> Although that might be equivalent to:
>
> >> class Project
> >> has_one :featured_project, :dependent => :destroy end
>
> >> -Rob
>
> >> On Feb 18, 2009, at 12:43 PM, yaphi wrote:
>
> >>> Hey Maurício,
>
> >>> I have a project model. What I'd like to do is set a project to
> >>> "featured" so I can display that on the homepage. By marking a
> >>> project as featured, I'd want all the other projects to
> >>> automatically have their "featured" column set to false.
>
> >>> On Feb 17, 8:55 pm, Maurício Linhares
> >>> <[email protected]>
> >>> wrote:
> >>>> No, there isn't. Maybe you're approaching the problem from the
> >>>> wrong point of view.
>
> >>>> Try to explain what is your problem that someone else might give
> >>>> you a better idea.
>
> >>>> -
> >>>> Maurício Linhareshttp://alinhavado.wordpress.com/(pt-br)
> >>>> |http://blog.codevader.com/(en)
>
> >>>> On Tue, Feb 17, 2009 at 10:13 PM, yaphi <[email protected]>
> >>>> wrote:
>
> >>>>> I'm not sure if there is a term for this (which is why I can't
> >>>>> find anything on google) but I want to be able to set one of my
> >>>>> models active, where the rest will be set to inactive.
>
> >>>>> I would guess to write a method that sets all the records to
> >>>>> inactive, then set the selected object to active. That seems
> >>>>> like it's pretty messy though. Is there some sort of built-in
> >>>>> functionality with rails that will only allow one column to be
> >>>>> true at a time?
>
> >> Rob Biedenharn http://agileconsultingllc.com
> >> [email protected]
>
> Rob Biedenharn http://agileconsultingllc.com
> [email protected]
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