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]
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