Ruby on Rails 在变量名中使用计数器，即“i" [英] Ruby on Rails using counter, i.e. "i", in a variable name

问题描述

我在 Rails 中有一个表单，用户可以在其中输入多条记录.我将编写一些 JavaScript，用户可以在其中拥有几乎无限数量的记录.我的哈希看起来像这样:

I have a form in Rails where users can enter multiple records. I am going to write some JavaScript where users can have a virtually unlimited number of records. My hash is going to look like this:

inputA_1, inputB_1, inputC_1
inputA_2, inputB_2, inpuctC_2

在我的控制器中，我想做一个 while 循环来遍历行并将它们保存到数据库中，例如:

In my controller I want to do a while loop to iterate through the rows and save them to the database, for example:

z = 0
i = 1
while z = 0
  @inputA = [:params][:inputA_i]
  @inputB = [:params][:inputB_i]
  @inputC = [:params][:inputC_i]
  if @inputA.nil?
     z=1
  else
  @record = [inputA: @inputA, inputB: @inputB, inputC: @inputC]
  @record.save
  i = i + 1
  end
end

问题是我不知道如何让:inputA_i的i"成为i的值.

The problem is that I don't know how to make the "i" of :inputA_i be the value of i.

对此的任何帮助将不胜感激.

Any help in that would be appreciated.

推荐答案

将 i 内插为字符串并将字符串转换为 symbol :

Interpolate i into a string and convert string to symbol:

@inputA = [:params]["inputA_#{i}".to_sym]
@inputB = [:params]["inputB_#{i}".to_sym]
@inputC = [:params]["inputC_#{i}".to_sym]

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