Question

我不能为我的生活弄清楚为什么划分不适用于这个Aslsx出口。我可以加，减，多，并且模数除法很好，但是当我尝试answer_number / question_number时，它总是出现为0.任何想法我做错了什么？

工作吐出answer_number次question_number：

@survey.questions.each do |question|
        question_number = Choice.where(question_id: question.id).length
        question.answers.each do |answer|
            answer_number = Choice.where(answer_id: answer.id).length
            sheet.add_row [answer_number, question_number, answer_number * question_number]
        end
    end

不起作用 - 吐出0：

@survey.questions.each do |question|
        question_number = Choice.where(question_id: question.id).length
        question.answers.each do |answer|
            answer_number = Choice.where(answer_id: answer.id).length
            sheet.add_row [answer_number, question_number, answer_number / question_number]
        end
    end

我还认为，当数字小于0时，它可能会进行某种舍入，但这似乎也不起作用（最终目标是获得每个答案的百分比）：

@survey.questions.each do |question|
        question_number = Choice.where(question_id: question.id).length
        question.answers.each do |answer|
            answer_number = Choice.where(answer_id: answer.id).length
            sheet.add_row [answer_number, question_number, answer_number / question_number * 100]
        end
    end

Answer 1

由于两个数字都是整数，因此ruby正在进行整数除法，它会忽略剩余的分数，我猜你所有的分区都返回0到1之间的数字，所以答案总是为0，以避免这两个数字中的一个应该是一个浮点数，就像@mtm建议的那样，将to_f函数添加到任一数字

Ruby Divide总是在Rails Axlsx Export中返回Zero

1 个答案: