ruby on rails - Haml: How to add classes dynamically to an element? -

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i have <tr> element in view, , want add classes dynamically on element depending on association between 2 models (many many between company , packaging).

the result should looks 

<tr class="pck1 pck3 pck5">

where pck1, pck3 , pck5 packagings associated company.

or simply:

%tr{ :class => classes }

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