<% question.input_options.each_with_index do | option, i | option_id = "#{question.question_id}_#{i}" checkbox_html = {class: 'checkbox', id: "answer_#{option_id}", name: "answer[checkbox][]", checked: Array(question.answer).include?(option) } %>

<%= form.check_box(:answer, checkbox_html, option, '') %> <%= form.label(option_id, option) %>

<% end %> <%= render partial: "quiz/answer_errors", locals: {question: question, answer: @answer} %>