[RUBY] Use variables for class and id names in haml

There were times when I wanted to index the class name during application development, and I was confused about how to write it, so please refer to it if there is a similar person.

Basic

First, the basic class name id name is written starting with "." And "#".

#name of the class
.item_name
%p.item_name

#ID name
#item_name
%p#item_name

How to write using variables

And this time I stumbled upon how to write using variable names in each statement. It was applied in the following writing style!

[email protected]_with_index do |item, i|
  %div{class: "#{item.name}"}
    %p{class: "item_name_#{i}"}

Enclose the class name in {} and it will be applied! It is applied in the same way even if it is not a each statement

%div{class: @item.name}

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