Rails - Aug 2009 - ActionController::UrlWriter bug -- need help URGENTLY, thanks!

So i''ve been banging my head against this for the better part of the
last 5 hours and I have concluded that in my sleep deprived state I''m
missing something really obvious and should just ask for help.

I need to be able to access named route helpers (XXX_path and XXX_URL)
form a class method in an ActiveRecord model. I tried a couple of
approaches none of which worked:

1) include ActionController::UrlWriter in the model class -- this
doesn''t work because the included methods are instance methods and
thus are not available in the class methods

2) According to the rails api you can access the helpers by using
ActionController::UrlWriter.xxx_path (http://api.rubyonrails.org/
classes/ActionController/UrlWriter.html). However that just doesn''t
work for me, I get the following error

NoMethodError: undefined method `xxx_path'' for
ActionController::UrlWriter:Module


If anyone has ANY ideas PLEASE let me know.

On Aug 15, 1:52 pm, "ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org"
<ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org>
wrote:
> So i''ve been banging my head against this for the better part of
the
> last 5 hours and I have concluded that in my sleep deprived state
I''m
> missing something really obvious and should just ask for help.
>
> I need to be able to access named route helpers (XXX_path and XXX_URL)
> form a class method in an ActiveRecord model. I tried a couple of
> approaches none of which worked:
>
> 1) include ActionController::UrlWriter in the model class -- this
> doesn''t work because the included methods are instance methods and
> thus are not available in the class methods
>
> 2) According to the rails api you can access the helpers by using
> ActionController::UrlWriter.xxx_path (http://api.rubyonrails.org/
> classes/ActionController/UrlWriter.html). However that just
doesn''t
> work for me, I get the following error
>
> NoMethodError: undefined method `xxx_path'' for
> ActionController::UrlWriter:Module
>
> If anyone has ANY ideas PLEASE let me know.
The helpers are defined in an anonymous module hidden inside the
routing stuff. You can ask rails to include that module in a class for
you, eg

class Foo
 include ActionController::UrlWriter
 def generate
  parent_categories_url :host => ''example.com''
 end
end
ActionController::Routing::Routes.named_routes.install(Foo)

Foo.new.generate #=> "http://example.com/admin/parent_categories"

Fred

This only works for instance methods, my problem is that I need to be
able to access xxxx_path from a class method... meaning:

class Foo
 include ActionController::UrlWriter
 def self.generate
  login_path :host => ''example.com''
 end
end
ActionController::Routing::Routes.named_routes.install(Foo)

Foo.generate
#=> NameError: undefined local variable or method `login_path'' for
Foo:Class
	from (irb):4:in `generate''
	from (irb):9

On Aug 15, 9:14 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On Aug 15, 1:52 pm,
"ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org"
<ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org> wrote:
>
>
>
> > So i''ve been banging my head against this for the better part
of the
> > last 5 hours and I have concluded that in my sleep deprived state
I''m
> > missing something really obvious and should just ask for help.
>
> > I need to be able to access named route helpers (XXX_path and XXX_URL)
> > form a class method in an ActiveRecord model. I tried a couple of
> > approaches none of which worked:
>
> > 1) include ActionController::UrlWriter in the model class -- this
> > doesn''t work because the included methods are instance
methods and
> > thus are not available in the class methods
>
> > 2) According to the rails api you can access the helpers by using
> > ActionController::UrlWriter.xxx_path (http://api.rubyonrails.org/
> > classes/ActionController/UrlWriter.html). However that just
doesn''t
> > work for me, I get the following error
>
> > NoMethodError: undefined method `xxx_path'' for
> > ActionController::UrlWriter:Module
>
> > If anyone has ANY ideas PLEASE let me know.
>
> The helpers are defined in an anonymous module hidden inside the
> routing stuff. You can ask rails to include that module in a class for
> you, eg
>
> class Foo
>  include ActionController::UrlWriter
>  def generate
>   parent_categories_url :host => ''example.com''
>  end
> end
> ActionController::Routing::Routes.named_routes.install(Foo)
>
> Foo.new.generate #=>
"http://example.com/admin/parent_categories"
>
> Fred

On Aug 15, 2:22 pm, "ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org"
<ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org>
wrote:
> This only works for instance methods, my problem is that I need to be
> able to access xxxx_path from a class method... meaning:
Well there''s nothing stopping you bundling up your url generation
stuff into its own class and then do UrlGenerator.new.generate (I''d
even reccomend it seing as install the routes will pollute your
model''s name space with loads of methods.
A small experiment shows that
ActionController::Routing::Routes.named_routes.install isn''t actually
needed - UrlWriter''s included method seems to call that for you

Fred

>
> class Foo
>  include ActionController::UrlWriter
>  def self.generate
>   login_path :host => ''example.com''
>  end
> end
> ActionController::Routing::Routes.named_routes.install(Foo)
>
> Foo.generate
> #=> NameError: undefined local variable or method `login_path''
for
> Foo:Class
>         from (irb):4:in `generate''
>         from (irb):9
>
> On Aug 15, 9:14 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
>
>
>
> > On Aug 15, 1:52 pm,
"ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org"
<ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org> wrote:
>
> > > So i''ve been banging my head against this for the better
part of the
> > > last 5 hours and I have concluded that in my sleep deprived state
I''m
> > > missing something really obvious and should just ask for help.
>
> > > I need to be able to access named route helpers (XXX_path and
XXX_URL)
> > > form a class method in an ActiveRecord model. I tried a couple of
> > > approaches none of which worked:
>
> > > 1) include ActionController::UrlWriter in the model class -- this
> > > doesn''t work because the included methods are instance
methods and
> > > thus are not available in the class methods
>
> > > 2) According to the rails api you can access the helpers by using
> > > ActionController::UrlWriter.xxx_path (http://api.rubyonrails.org/
> > > classes/ActionController/UrlWriter.html). However that just
doesn''t
> > > work for me, I get the following error
>
> > > NoMethodError: undefined method `xxx_path'' for
> > > ActionController::UrlWriter:Module
>
> > > If anyone has ANY ideas PLEASE let me know.
>
> > The helpers are defined in an anonymous module hidden inside the
> > routing stuff. You can ask rails to include that module in a class for
> > you, eg
>
> > class Foo
> >  include ActionController::UrlWriter
> >  def generate
> >   parent_categories_url :host => ''example.com''
> >  end
> > end
> > ActionController::Routing::Routes.named_routes.install(Foo)
>
> > Foo.new.generate #=>
"http://example.com/admin/parent_categories"
>
> > Fred

Yea i guess it just seems silly to create a separate class who''s only
purpose is to include ActionController::UrlWriter, especially since
the rails documentation says that you can simply call
ActionController::UrlWriter.xxx_path.

On Aug 15, 9:32 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On Aug 15, 2:22 pm,
"ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org"
<ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org> wrote:
>
> > This only works for instance methods, my problem is that I need to be
> > able to access xxxx_path from a class method... meaning:
>
> Well there''s nothing stopping you bundling up your url generation
> stuff into its own class and then do UrlGenerator.new.generate
(I''d
> even reccomend it seing as install the routes will pollute your
> model''s name space with loads of methods.
> A small experiment shows that
> ActionController::Routing::Routes.named_routes.install isn''t
actually
> needed - UrlWriter''s included method seems to call that for you
>
> Fred
>
>
>
> > class Foo
> >  include ActionController::UrlWriter
> >  def self.generate
> >   login_path :host => ''example.com''
> >  end
> > end
> > ActionController::Routing::Routes.named_routes.install(Foo)
>
> > Foo.generate
> > #=> NameError: undefined local variable or method
`login_path'' for
> > Foo:Class
> >         from (irb):4:in `generate''
> >         from (irb):9
>
> > On Aug 15, 9:14 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > wrote:
>
> > > On Aug 15, 1:52 pm,
"ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org"
<ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org> wrote:
>
> > > > So i''ve been banging my head against this for the
better part of the
> > > > last 5 hours and I have concluded that in my sleep deprived
state I''m
> > > > missing something really obvious and should just ask for
help.
>
> > > > I need to be able to access named route helpers (XXX_path
and XXX_URL)
> > > > form a class method in an ActiveRecord model. I tried a
couple of
> > > > approaches none of which worked:
>
> > > > 1) include ActionController::UrlWriter in the model class --
this
> > > > doesn''t work because the included methods are
instance methods and
> > > > thus are not available in the class methods
>
> > > > 2) According to the rails api you can access the helpers by
using
> > > > ActionController::UrlWriter.xxx_path
(http://api.rubyonrails.org/
> > > > classes/ActionController/UrlWriter.html). However that just
doesn''t
> > > > work for me, I get the following error
>
> > > > NoMethodError: undefined method `xxx_path'' for
> > > > ActionController::UrlWriter:Module
>
> > > > If anyone has ANY ideas PLEASE let me know.
>
> > > The helpers are defined in an anonymous module hidden inside the
> > > routing stuff. You can ask rails to include that module in a
class for
> > > you, eg
>
> > > class Foo
> > >  include ActionController::UrlWriter
> > >  def generate
> > >   parent_categories_url :host =>
''example.com''
> > >  end
> > > end
> > > ActionController::Routing::Routes.named_routes.install(Foo)
>
> > > Foo.new.generate #=>
"http://example.com/admin/parent_categories"
>
> > > Fred

As in many cases, if it''s difficult to do in Rails, it''s
probably
wrong. Can you give more detail on why you''re generating URLs in a
model rather than in the controller/view that''s sending them to the
user?

--Matt Jones

On Aug 15, 9:22 am, "ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org"
<ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org>
wrote:
> This only works for instance methods, my problem is that I need to be
> able to access xxxx_path from a class method... meaning:
>
> class Foo
>  include ActionController::UrlWriter
>  def self.generate
>   login_path :host => ''example.com''
>  end
> end
> ActionController::Routing::Routes.named_routes.install(Foo)
>
> Foo.generate
> #=> NameError: undefined local variable or method `login_path''
for
> Foo:Class
>         from (irb):4:in `generate''
>         from (irb):9
>
> On Aug 15, 9:14 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
>
>
>
> > On Aug 15, 1:52 pm,
"ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org"
<ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org> wrote:
>
> > > So i''ve been banging my head against this for the better
part of the
> > > last 5 hours and I have concluded that in my sleep deprived state
I''m
> > > missing something really obvious and should just ask for help.
>
> > > I need to be able to access named route helpers (XXX_path and
XXX_URL)
> > > form a class method in an ActiveRecord model. I tried a couple of
> > > approaches none of which worked:
>
> > > 1) include ActionController::UrlWriter in the model class -- this
> > > doesn''t work because the included methods are instance
methods and
> > > thus are not available in the class methods
>
> > > 2) According to the rails api you can access the helpers by using
> > > ActionController::UrlWriter.xxx_path (http://api.rubyonrails.org/
> > > classes/ActionController/UrlWriter.html). However that just
doesn''t
> > > work for me, I get the following error
>
> > > NoMethodError: undefined method `xxx_path'' for
> > > ActionController::UrlWriter:Module
>
> > > If anyone has ANY ideas PLEASE let me know.
>
> > The helpers are defined in an anonymous module hidden inside the
> > routing stuff. You can ask rails to include that module in a class for
> > you, eg
>
> > class Foo
> >  include ActionController::UrlWriter
> >  def generate
> >   parent_categories_url :host => ''example.com''
> >  end
> > end
> > ActionController::Routing::Routes.named_routes.install(Foo)
>
> > Foo.new.generate #=>
"http://example.com/admin/parent_categories"
>
> > Fred

I am generating a URL for use with GoogleCheckout. I have a method in
a model that uses the visitors shopping cart to construct an xml
request to GoogleCheckout, in that request i need to include a
callback url that GoogleCheckout can use to contact my webapp.

On Aug 16, 11:07 am, Matt Jones
<al2o...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> As in many cases, if it''s difficult to do in Rails, it''s
probably
> wrong. Can you give more detail on why you''re generating URLs in a
> model rather than in the controller/view that''s sending them to
the
> user?
>
> --Matt Jones
>
> On Aug 15, 9:22 am,
"ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org"
<ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org> wrote:
>
> > This only works for instance methods, my problem is that I need to be
> > able to access xxxx_path from a class method... meaning:
>
> > class Foo
> >  include ActionController::UrlWriter
> >  def self.generate
> >   login_path :host => ''example.com''
> >  end
> > end
> > ActionController::Routing::Routes.named_routes.install(Foo)
>
> > Foo.generate
> > #=> NameError: undefined local variable or method
`login_path'' for
> > Foo:Class
> >         from (irb):4:in `generate''
> >         from (irb):9
>
> > On Aug 15, 9:14 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > wrote:
>
> > > On Aug 15, 1:52 pm,
"ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org"
<ad...-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org> wrote:
>
> > > > So i''ve been banging my head against this for the
better part of the
> > > > last 5 hours and I have concluded that in my sleep deprived
state I''m
> > > > missing something really obvious and should just ask for
help.
>
> > > > I need to be able to access named route helpers (XXX_path
and XXX_URL)
> > > > form a class method in an ActiveRecord model. I tried a
couple of
> > > > approaches none of which worked:
>
> > > > 1) include ActionController::UrlWriter in the model class --
this
> > > > doesn''t work because the included methods are
instance methods and
> > > > thus are not available in the class methods
>
> > > > 2) According to the rails api you can access the helpers by
using
> > > > ActionController::UrlWriter.xxx_path
(http://api.rubyonrails.org/
> > > > classes/ActionController/UrlWriter.html). However that just
doesn''t
> > > > work for me, I get the following error
>
> > > > NoMethodError: undefined method `xxx_path'' for
> > > > ActionController::UrlWriter:Module
>
> > > > If anyone has ANY ideas PLEASE let me know.
>
> > > The helpers are defined in an anonymous module hidden inside the
> > > routing stuff. You can ask rails to include that module in a
class for
> > > you, eg
>
> > > class Foo
> > >  include ActionController::UrlWriter
> > >  def generate
> > >   parent_categories_url :host =>
''example.com''
> > >  end
> > > end
> > > ActionController::Routing::Routes.named_routes.install(Foo)
>
> > > Foo.new.generate #=>
"http://example.com/admin/parent_categories"
>
> > > Fred

admin-Onn4oRDAYSFWk0Htik3J/w@public.gmane.org wrote:
> I am generating a URL for use with GoogleCheckout. I have a method in
> a model that uses the visitors shopping cart to construct an xml
> request to GoogleCheckout, in that request i need to include a
> callback url that GoogleCheckout can use to contact my webapp.
I am in the same situation, needing to access the named routes from 
within a class method and am having no luck coming up with a logic 
solution. It seems that every post out there asking the same thing gets 
met with "if it''s so difficult, you probably shouldn''t be
doing it." I
usually agree with this, but generating a callback for any 3rd party api 
calls that get made at a class level seems like a pretty acceptable 
requirement.

Did you ever come to a solution that worked for you admin@fotocera?
-- 
Posted via http://www.ruby-forum.com/.

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.