How to do data- attributes with Haml and Rails?

Question

Try this:

%a{"data-toggle-description-length" => "toggle_me_ajax", href: "#"}

OR

%a{href: "#", :data => {:toggle_description_length => "toggle_me_ajax"}}

For more details refer here

You can also use html2haml converter available online

EDIT:

As mentioned in comments there are a couple more syntaxes which would work

 %a{href: "#", { "data-toggle-description-length": "toggle_me_ajax" }}

OR

%a{href: "#", { :"data-toggle-description-length" => "toggle_me_ajax" }}

I would still prefer first two though as I think latter ones look ugly and kinda messy.