Paperclip attachments with dynamic style sizes from Model
Using Rails 2, I try to separate different, dynamic image sizes trough another Model from the Paperclip-Model. My current approach, using a Proc, looks the following:
class File < ActiveRecord::Base
has_many :sizes, :class_name => "FileSize"
has_attached_file(
:attachment,
:styles => Proc.new { |instance| instance.attachment_sizes }
)
def attachment_sizes
sizes = { :thumb => ["100x100"] }
self.sizes.each do |size|
sizes[:"#{size.id}"] = ["#{size.width}x#{size.height}"]
开发者_JAVA技巧 end
sizes
end
end
class FileSize < ActiveRecord::Base
belongs_to :file
after_create :reprocess
after_destroy :reprocess
private
def reprocess
self.file.attachment.reprocess!
end
end
Everything seems to work out fine but apparently no styles are processed and no image is being created.
Did anyone manage doing stuff like this?
-- Update --
Obviously the method attachment_sizes on instance sometimes is not defined for # - but shouldn't instance actually be #? For me this looks like altering instance..
The solution is simple. instance
in my first example Proc is an instance of Paperclip::Attachment. As I want to call a File
method, one has to get the calling instance inside the Proc:
Proc.new { |clip| clip.instance.attachment_sizes }
instance
represents File
-instance in the given example.
I'm assuming you have everything working with paperclip, such that you have uploaded an image and now the proc is just not working.
It should work. Try not putting the size in an array.
You are doing this
sizes = { :thumb => ["100x100"] }
But I have it where I'm not putting the size in an arry
sizes = { :thumb => "100x100" }
Give that a try :)
精彩评论