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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