Rails - Apr 2006 - file_column with polymorphic table relationship?

Hello,

I''m just starting out with both Rails and Ruby, so I hope this
isn''t too
simple of a question - but I''ve been struggling to find a solution.

I''m using the file_column plugin to handle image uploads and thumbnail
generation.  In addition, I''ve wrapped the image into a polymorphic
table
so I can have uploaded images associated with multiple datatypes. 
However, I''m having trouble determining how to reference the
file_column
field in the images table from an associated view.

As an example, here''s a condensed version of the relationships:

    create_table :images do |t|
      t.column :file, :string
      t.column :illustrated_id, :integer
      t.column :illustrated_type, :string
    end

    create_table :thing do |table|
      table.column :name, :string
      table.column :description, :string
    end

...and models:

class Thing < ActiveRecord::Base
  has_one :image, :as => :illustrated
end

class Image < ActiveRecord::Base
  belongs_to :illustrated, :polymorphic => true
  file_column :file, :magick => {
    :versions => { "thumb" => "100x100",
"medium" => "640x480>" },
    :attributes => { :format => "JPG" }
  }
end


Now, in an Image view - which in practice I don''t think I would use,
but
for the sake of demonstration - I can do something like this to get the
uploads working without a problem:

<%= file_column_field "image", "file" %>

But how would I do the same from the so-called "Thing" view?  Or is it
not
possible to handle in the view without writing a model method?  I''d
prefer
not to, as there would be several models with duplicated code.

Thank you!

Dan Naab

Daniel, not sure if reading this correctly, but to display a photo that 
belongs to Thing you could do something like this:

In the controller:
@image = @thing.image

In the view:
<%= image_tag(url_for_file_column("image", "file")) if
@image %>

To upload is a bit more tricky (mainly on the controller side). If 
that''s what you''re wanting, post back, and I''ll show
you how I did it.


Daniel Naab wrote:
> Hello,
>
> I''m just starting out with both Rails and Ruby, so I hope this
isn''t too
> simple of a question - but I''ve been struggling to find a
solution.
>
> I''m using the file_column plugin to handle image uploads and
thumbnail
> generation.  In addition, I''ve wrapped the image into a
polymorphic table
> so I can have uploaded images associated with multiple datatypes. 
> However, I''m having trouble determining how to reference the
file_column
> field in the images table from an associated view.
>
> As an example, here''s a condensed version of the relationships:
>
>     create_table :images do |t|
>       t.column :file, :string
>       t.column :illustrated_id, :integer
>       t.column :illustrated_type, :string
>     end
>
>     create_table :thing do |table|
>       table.column :name, :string
>       table.column :description, :string
>     end
>
> ...and models:
>
> class Thing < ActiveRecord::Base
>   has_one :image, :as => :illustrated
> end
>
> class Image < ActiveRecord::Base
>   belongs_to :illustrated, :polymorphic => true
>   file_column :file, :magick => {
>     :versions => { "thumb" => "100x100",
"medium" => "640x480>" },
>     :attributes => { :format => "JPG" }
>   }
> end
>
>
> Now, in an Image view - which in practice I don''t think I would
use, but
> for the sake of demonstration - I can do something like this to get the
> uploads working without a problem:
>
> <%= file_column_field "image", "file" %>
>
> But how would I do the same from the so-called "Thing" view?  Or
is it not
> possible to handle in the view without writing a model method? 
I''d prefer
> not to, as there would be several models with duplicated code.
>
> Thank you!
>
> Dan Naab
>
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
>

On Sat, April 29, 2006 3:07 am, Chris T wrote:
> To upload is a bit more tricky (mainly on the controller side). If
> that''s what you''re wanting, post back, and I''ll
show you how I did it.
Sorry for not being more clear.  I am indeed asking how to do an upload
from the "Thing" view.

Thanks,
Dan