Thanks for the quick response, but that gives me: undefined method
`id' for #<Class:0x000000031017a8>

I was under the belief that the single quotes were needed as per:
https://groups.google.com/group/rubyonrails-talk/msg/d70a164a4156b70f?hl=en%C6%91a8df27585ace3


On May 14, 9:20 am, Jeremy Walker <jez.wal...@gmail.com> wrote:
> On 14 May 2012 14:11, Tuckie <witu...@gmail.com> wrote:
>
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> > I'm working on creating a model that allows redirect to another
> > instance of the same type (Page).  For obvious reasons, I don't want
> > it to be able to redirect to itself. How can I get the model to
> > properly filter this relationship? I'm currently getting the error:
>
> > Mysql2::Error: You have an error in your SQL syntax; check the manual
> > that corresponds to your MySQL server version for the right syntax to
> > use near '' at line 1: SELECT `pages`.* FROM `pages`  WHERE (id !=
> > #{self.id})
>
> > From what I've read, it should be replacing #{self.id} with the
> > current instance.
>
> > class Page < ActiveRecord::Base
> >  has_ancestry
> >  belongs_to :footer,
> >    :foreign_key => 'footer_id',
> >    :class_name => 'ReusableText'
> >  belongs_to :redirect_to_page,
> >    :foreign_key => 'redirect_to_page_id',
> >    :class_name => 'Page',
> >    :conditions => 'id != #{self.id}'
>
> Use double quotes, not single quotes around "id != #{self.id}"
>
> You might be better doing the following instead to avoid SQL injection:
> :conditions => ['id != ?', self.id]
>
> Jeremy Walker
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> > ...
>
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