如何在 Ruby on Rails 中为第一个输入添加 active 类
<%20isFirst%20%3D%20true%20%3E%0A<%20%40product.product_skus.each%20do%20%7Cproduct_sku%7C%3E%0A%20%20<label%20class%3D%22btn%20btn-default%20sku-btn%20%3C%3D%20'active'%20if%20isFirst%20%3E%22%20title%3D%22%3C%3D%20product_sku.description%20%3E%22%20data-stock%3D%22%3C%3D%20product_sku.stock%20%3E%22%20data-price%3D%22%3C%3D%20product_sku.price%20%3E%22%20data-id%3D%22%3C%3D%20product_sku.id%20%3E%22%3E%0A%20%20%20%20<%20if%20isFirst%20%3E%0A%20%20%20%20%20%20<%20isFirst%20%3D%20false%20%3E%0A%20%20%20%20<%20end%20%3E%0A%20%20%20%20<input%20type%3D%22radio%22%20name%3D%22skus%22%20autocomplete%3D%22off%22%20value%3D%22%3C%3D%20product_sku.id%20%3E%22%3E%20%3C%3D%20product_sku.title%20%3E%0A%20%20</label%3E%0A<%20end%20%3E
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