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. Passing a filename without an extension is deprecated. 

  image_path("edit.png")  # => /images/edit.png
  image_path("icons/edit.png")  # => /images/icons/edit.png
  image_path("/icons/edit.png")  # => /icons/edit.png
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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