Flowdock
image_path(source) public

Computes the path to an image asset in the public images directory. Full paths from the document root will be passed through. Used internally by image_tag to build the image path: 

  image_path("edit")                                         # => "/images/edit"
  image_path("edit.png")                                     # => "/images/edit.png"
  image_path("icons/edit.png")                               # => "/images/icons/edit.png"
  image_path("/icons/edit.png")                              # => "/icons/edit.png"
  image_path("http://www.railsapplication.com/img/edit.png") # => "http://www.railsapplication.com/img/edit.png"

If you have images as application resources this method may conflict with their named routes. The alias path_to_image is provided to avoid that. Rails uses the alias internally, and plugin authors are encouraged to do so.

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December 31, 2011 - (v3.1.0)
0 thanks

Recommendations

I would just use the path_to_image. I find that this is what works best. As it says above it can create problems.

Here is my code

Code example 

def background_path(background)
  if background
    path_to_image background.file_name.normal
  else
    path_to_image "background_preview.jpg"
  end
end

def flavor_path(flavor)
  if flavor
    path_to_image flavor.file_name.normal
  else
    path_to_image("flavor_preview.jpg")
  end
end

basic but gets the job done and it does not have problem with my pre built paths which are called image_path