Elliott Blatt wrote:
> Hi,
>
> I'm using attachment_fu with great success, but have run into a
> requirement that I'd like to solve elegantly -- but I've outstripped my
> ruby skills.
> I have a class that returns a hash of thumbnail definitions, like so:
> class Thumb
> def self.get_thumbs(style)
> return { :small => "100x50", :large => "200x100" } if style
> == 'landscape'
> return { :small => "50x100", :large => "100x200" } if style
> == 'portrait'
> end
> end
>
> My attachment model is defined like this:
>
> class Photo < ActiveRecord::Base
> has_attachment :content_type => :image,
> :thumbnails => Thumb.get_thumbs(??????)
> [...more stuff ...]
> end
>
> My photos controller has the following line:
>
> @photo = Photo.new(params[:photo])
>
> My question:
>
> I'd like dynamically determine what value to set to Thumbnail.get_thumbs
> based on values set in the Photo.new constructor. Is this possible?
> I've fooled around with attr_accessors, lambdas, etc, but, I can't seem
> to do what I want. Is it possible to make such a run-time decision as
> I'm trying to make?
>
> Which is to say, if params[:photo][:style] = 'portrait', i'd like to cut
> the thumbnails accordingly?
>
>
> Does anyone have an elegant solution for this?
A non-thread-safe solution may be:
after_save 'attachment_options[:thumbnails] = Thumb.get_thumbs(style)'
has_attachment :content_type => :image,
:thumbnails => Thumb.get_thumbs('landscape')
but a better solution may be to add PortraitPhoto and LandscapePhoto
sub-classes.
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