Hi to everyone,
I have the following models:
class Attachment < ActiveRecord::Base
has_attachment :content_type => [:image, 'application/pdf'],
:max_size => 3.megabytes,
:path_prefix => '../private/attachments',
:storage => :file_system,
:processor => :rmagick,
:thumbnails => { :small => '32x32', :medium =>
'64x64', :large => '256x256' }
validates_as_attachment
belongs_to :attachable, :polymorphic => true
end
class Maker < ActiveRecord::Base
validates_presence_of :name, :on => :create, :message => "can't be
blank"
validates_uniqueness_of :name, :message => 'name must be unique'
validates_presence_of :description, :on => :create, :message => "can't
be blank"
has_one :attachment, :as => :attachable, :dependent => :destroy
has_one :logo, :through => :attachment, :source => :attachable,
:source_type => 'Maker', :dependent => :destroy,
:conditions => ['attachments.content_type = ?',
'image/jpeg' ]
has_many :products
def deletable?
self.products.empty?
end
end
What I would like to accomplish is to have a "logo" association on the
"Maker" model which allows
me to fetch the logo (eventually) associated to the maker.
The row:
has_one :logo, :through => :attachment, :source => :attachable,
:source_type => 'Maker', :dependent => :destroy,
:conditions => ['attachments.content_type = ?',
'image/jpeg' ]
produces the same results of:
has_one :another_logo, :class_name => 'Attachment', :foreign_key =>
'attachable_id', :conditions => ['attachable_type = ?', 'Maker' ]
Which one is the best approach to achieve the desired result?
Thanks in advance for your help
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