Rails 3：创建新的rails资产助手，如image_tag，指向s3

Question

What would be the best way to create a new asset tag helper that would work the exact same way as image_tag, except pointed to s3?

So I'd like this to happen:

image_path "foo.jpg" # => "/assets/foo.jpg" (default behavior)
s3_image_path "bar.jpg" # => "http://site.s3.amazon.com/assets/bar.jpg"

Would the best way to do this be just to make a new helper in application_helper.rb?

Answer 1

I just ended up writing new helpers in application_helper.rb that mimicked the default asset helpers like so:

def s3_image_path(filename)
  "http://site.s3.amazonaws.com/assets/#{filename}"
end

def s3_image_tag(filename, options={})
  image_tag(s3_image_path(filename), options)
end

So s3_image_tag("image.jpg") will point to http://site.s3.amazonaws.com/assets/image.jpg .

Answer 2

If site.s3.. is not in the rails application and not using the asset_pipeline, then just reference the url directly in the image src.

If s3 is your application site, then yes just a write a new helper in the context it will be used for.

Or something for http://site.s3.amazon.com/assets/bar.jpg would look like

<img src="<%=@root_url%>/assets/bar.jpg" />

So, why is the other one different? I mean why do you have two?

Edit:

What I would do is just have a string holding the url to the hosted site in the application helper. Then the helper method to return the image tag("img", :src => "#{s3_image_link}/bar.jpg")