From: Josh Cheek <josh.cheek@...>
Date: 2010-02-16T15:10:26+09:00
Subject: Re: Find by association table

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On Mon, Feb 15, 2010 at 11:49 PM, Greg Ma <gregorylepacha@msn.com> wrote:

> Greg Ma wrote:
> > Hi,
> > I did a the method below that return all students who has the method
> > parameter in their tags collection.
> > I am sure this is pretty by coded, could someone help clean it up please
> > :)
> >
>
> I correct myself, but there is still probably something cleaner possible
>
> #method
>   def find_student_by_tag(tag)
>      students = Student.find(:all)
>
>     students.each do |student|
>       students.delete(student) unless
>  students.tags.find_by_name(tag)
>      end
>     students
>   end
> >
> > Greg
>
> --
> Posted via http://www.ruby-forum.com/.
>
>
Based on the similar topic to your previous post, which seemed to be a Rails
application (if you recall, I suggested you would have more luck at the
Rails mailing list http://groups.google.com/group/rubyonrails-talk ), I
would suggest that you should have an association between students and tags.
Probably a has_and_belongs_to_many association through a join table (
http://guides.rubyonrails.org/association_basics.html#the-has-and-belongs-to-many-association).

If this is the case, then you should be able to simply say:
def find_students_by_tag(tag)
  tag.students
end

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