问题
I am using Rails to make a small file upload app. For file attachment I am using the wonderful Paperclip but I can't work out how to do downloads.
How would I create a link in my show view, that is passed the file id, for instance that would allow the user to download a file on my server?
回答1:
If the file uploaded is attached to a model, e.g. as an attribute called avatar, then you can create a link like:
<%= link_to "Download", model.avatar.url(:original, false) %>
Replace avatar with the name of your attribute.
回答2:
Replace whatever by name that are user in your model for paper clip if you have
resource_file_name, resource_file_name, resource_file_name,
then replace whatever by resource
来源：https://stackoverflow.com/questions/5016194/file-download-using-paperclip