This quick post is about some Paperclip-related code that I see quite frequently that could cause problems. It’s easy to miss this stuff in development and then get major headaches later.


class User < ActiveRecord::Base

has_attached_file :photo

end

class Product < ActiveRecord::Base

has_attached_file :photo

end

The trouble is that by default the attachments will be stored in /public/system/photos/RECORD_ID/original/FILENAME and this can get messy if you have several types of records with the same id putting photos there.

In the example above you could potentially get

/public/system/photos/1/original/my_new_profile_picture.jpg

/public/system/photos/1/original/some_product_picture.jpg

This could get even messier if User.id=1 decides to upload a photo called nice.jpg and Product.id=1 also has a photo called nice.jpg.

Luckily Paperclip makes it really easy to fix this without having to do something ugly like change the photo attribute to user_photo and product_photo.


class User < ActiveRecord::Base

has_attached_file :photo, :path => ":rails_root/public/system/users/:attachment/:id/:style/:basename.:extension", :url => "/system/users/:attachment/:id/:style/:basename.:extension"

end

class Product < ActiveRecord::Base

has_attached_file :photo, :path => ":rails_root/public/system/products/:attachment/:id/:style/:basename.:extension",  :url => "/system/products/:attachment/:id/:style/:basename.:extension"

end

This will produce the following urls

/public/system/users/photos/1/original/my_new_profile_picture.jpg

/public/system/products/photos/1/original/some_product_picture.jpg

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