Method: FileColumnHelper#url_for_file_column

Defined in:
lib/file_column_helper.rb

#url_for_file_column(object, method, options = nil) ⇒ Object

Creates an URL where an uploaded file can be accessed. When called for an Entry object with id 42 (stored in @entry) like this

<%= url_for_file_column(@entry, "image")

the following URL will be produced, assuming the file “test.png” has been stored in the “image”-column of an Entry object stored in @entry:

/entry/image/42/test.png

This will produce a valid URL even for temporary uploaded files, e.g. files where the object they are belonging to has not been saved in the database yet.

The URL produces, although starting with a slash, will be relative to your app’s root. If you pass it to one rails’ image_tag helper, rails will properly convert it to an absolute URL. However, this will not be the case, if you create a link with the link_to helper. In this case, you can pass :absolute => true to options, which will make sure, the generated URL is absolute on your server. Examples:

<%= image_tag url_for_file_column(@entry, "image") %>
<%= link_to "Download", url_for_file_column(@entry, "image", :absolute => true) %>

If there is currently no uploaded file stored in the object’s column this method will return nil.



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# File 'lib/file_column_helper.rb', line 56

def url_for_file_column(object, method, options=nil)
  case object
  when String, Symbol
    object = instance_variable_get("@#{object.to_s}")
  end

  # parse options
  subdir = nil
  absolute = false
  if options
    case options
    when Hash
      subdir = options[:subdir]
      absolute = options[:absolute]
    when String, Symbol
      subdir = options
    end
  end
  
  relative_path = object.send("#{method}_relative_path", subdir)
  return nil unless relative_path

  url = ""
  url << ActionController::Base.relative_url_root.to_s if absolute
  url << "/"
  url << object.send("#{method}_options")[:base_url] << "/"
  url << relative_path
end