Using ruby variable for class name in HAML

I have the piece of code where I am trying to use a variable for a class name in HAML. Here it is:

      - data_table(@installation_requests, nil, {:placeholder => ''}) do |installation_request, css_class|
          %tr{:class => css_class}

I can't see anything wrong with it, RubyMine IDE doesn't pick an error either, it thinks that it is legitimate use of the variable. I'm getti开发者_JAVA百科ng the following error:

odd number of arguments for Hash

Can anyone point me to what's wrong with the code above?

What if you try:

- data_table(@installation_requests, nil, {:placeholder => ''}) do |installation_request, css_class|
  %tr{:class => "#{css_class}"}

or if you are saving your views as view.html.haml:

- data_table(@installation_requests, nil, {:placeholder => ''}) do |installation_request, css_class|
  <tr class="#{css_class}">
  ....stuff....
  </tr>

The Hash can actually neatly pass an array passed to it into a sequence of keys and values.

For e.g.:

Hash["a", "apple", "b", "boy"]       #=> {"a"=>"apple", "b"=>"boy"}

If you pass an odd number of arguments to be splat into key/value pairs...

Hash["a", "apple", "b", "boy", "c"]  #=> odd number of arguments for Hash

So, I am pretty sure this is happening somewhere inside the data_table method. So, please check if an array is being splat into Hash somewhere in the sequence of function calls!