Rails - Mar 2010 - Associating a default paperclip image from a different model

Here''s some code, this is my NewsItem model as you can see...

class NewsItem < ActiveRecord::Base
  belongs_to :country
  has_attached_file :image, :styles => { :original =>
''57x57'' },
:default_url => ''/images/football.png''

  #   has_attached_file :image,
  #                     :styles => { :original =>
''57x57'' },
  #                     :default_url => self.country.flag.url

  validates_attachment_content_type :image, :content_type =>
[''image/png''], :message => "only pngs are
allowed."
  validates_presence_of :title
  validates_length_of :title, :within => 3..50
  validates_presence_of :url
end

I have a Country model also which has a flag (paperclip attached
image)...What I''d like to do is make the default image for the NewsItem
be the Country flag? My commented out code shows my unsuccessful
attempt, I believe it''s along those lines, but not what I have!
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On 17 March 2010 17:29, bingo bob
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:
> Here''s some code, this is my NewsItem model as you can see...
>
> class NewsItem < ActiveRecord::Base
>  belongs_to :country
>  has_attached_file :image, :styles => { :original =>
''57x57'' },
> :default_url => ''/images/football.png''
>
>  #   has_attached_file :image,
>  #                     :styles => { :original =>
''57x57'' },
>  #                     :default_url => self.country.flag.url
>
>  validates_attachment_content_type :image, :content_type =>
> [''image/png''], :message => "only pngs are
allowed."
>  validates_presence_of :title
>  validates_length_of :title, :within => 3..50
>  validates_presence_of :url
> end
>
> I have a Country model also which has a flag (paperclip attached
> image)...What I''d like to do is make the default image for the
NewsItem
> be the Country flag? My commented out code shows my unsuccessful
> attempt, I believe it''s along those lines, but not what I have!
What was the result of your code?  Was it a syntax error or run time?

Colin

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Hi Colin,

Here''s the error I get with my code...

undefined method `country'' for #<Class:0x10344bac0>

just to reiterate here, what i''d like to do here is set the default 
image (paperclipped) to be that of the "belonged_to" country...

bb.
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Just to be clear that error is generated with this code in place...

class NewsItem < ActiveRecord::Base
  belongs_to :country
  # has_attached_file :image, :styles => { :original =>
''57x57'' },
:default_url => ''/images/football.png''

  has_attached_file  :image,
                     :styles => { :original => ''57x57''
},
                     :default_url => self.country.flag.url

  validates_attachment_content_type :image, :content_type => 
[''image/png''], :message => "only pngs are
allowed."
  validates_presence_of :title
  validates_length_of :title, :within => 3..50
  validates_presence_of :url
end
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