Rails - May 2006 - can''t call link_to from within a model class

can anyone tell me how to call link_to from within a model class? I''m
trying to do something like the following:

  validates_uniqueness_of :email, :message => "address has already
been taken.  If you''ve forgotten your password, please click " +
link_to(''here'', :action =>
''forgot_password'', :controller => ''site'')
+
" to reset it."

although I get the following error when it attempts to validate a form:

Session contains objects whose class definition isn''t available.
Remember to require the classes for all objects kept in the session.
(Original exception: undefined method `link_to'' for User:Class
[NoMethodError])

I''ve also tried doing:

class User < ActiveRecord::Base
  include ActionView::Helpers::UrlHelper

...

but calling link_to produces the same error.. I''ve also tried:


  validates_uniqueness_of :email, :message => "address has already
been taken.  If you''ve forgotten your password, please click " +
ActionView::Helpers::UrlHelper:link_to(''here'', :action =>
''forgot_password'', :controller => ''site'')
+ " to reset it.

but that gives me:

Session contains objects whose class definition isn''t available.
Remember to require the classes for all objects kept in the session.
(Original exception: undefined method `link_to'' for
ActionView::Helpers::UrlHelper:Module [NoMethodError])

if anyone can help me, I''d really appreciate it.. Thanks,

Mike

On 5/11/2006, "Mike Garey" <random52k@gmail.com>
wrote:
>can anyone tell me how to call link_to from within a model class?
I''m
>trying to do something like the following:
That would break the model/view/controller paradigm.

The model isn''t supposed to know anything about the view (or even how
the data is rendered).

On 5/11/06, Deirdre Saoirse Moen <deirdre@deirdre.net>
wrote:
> On 5/11/2006, "Mike Garey" <random52k@gmail.com> wrote:
> >can anyone tell me how to call link_to from within a model class?
I''m
> >trying to do something like the following:
>
> That would break the model/view/controller paradigm.
>
> The model isn''t supposed to know anything about the view (or even
how
> the data is rendered).
true, but in my case, my choices are either using link_to/url_for or
hardcoding a <a href> tag, and I wanted to avoid the latter.  So yes,
I realize this breaks the separation of the model from the view, but
since the validation messages are provided by the model, I can''t think
of how else I should do this..  Thanks,

Mike

Ultimately, the built in validation message methods really aren''t good 
enough for stuff like this. On a recent project in a similar situation, 
we used @object.errors.full_messages to get an array containing all the 
error messages, and then produced custom output based on those errors. 
Its a lot less clean, but honestly, there''s not much way around it.

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