How to do data- attributes with haml and rails?

There's really not much need to use { ... } style in haml. HTML style attributes are a more flexible and natural way for html generation.

%a(href="#" data-toggle="target") my link

No commas, no hash rockets etc. are required. You can also very easily interpolate or directly assign variables without switching styles.

e.g.

%a(href=link data-toggle="#{id}-toggle")

Where link and id are variables from the currently bound scope.

Notably you can also seamlessly include attributes from xmlns, svg generation uses a lot of namespace prefixes for example:

%link(xlink:type="simple" xlink:href=link)

There's no compelling reason to use another style.

Try this:

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

%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" }}

%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.

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