新手:在我的情况下文本替换 [英] Newbie: text replacement in my case

问题描述

在我的 Ruby on Rails 应用程序中，我的助手中有一个方法可以通过以下方式打开文件:

In my Ruby on Rails app, I have a method in my helper which opened a file by:

content = File.open(myfile.txt)

文件内容如下:

my.car , my.seat, my.age;
my.son , my.dog, my.chair;
...

所以，我按;"分割内容，如下所示:

So, I split the content by ";" like following:

content.split(';').each do |line|
      #Here, I want to replace the text from "my" to "her" on each line
end

如何将内容中每一行的我的"替换为她的"?

即更新内容:

her.car , her.seat, her.age;
her.son , her.dog, her.chair;
...

-------------------------- 更新---------------------------------

我想更新打开文件的内容，而不只是在从ruby代码读取内容时替换字符串.

I would like to update the content of the opened file , not only replace the string when read the content from the ruby code.

推荐答案

没有办法动态修改文件内容.文件只能追加，不能扩展，所以你不能用her替换my.

There is no way to modify the content of a file on the fly. Files can only be appended, they cannot be expanded, so you cannot replace my with her.

你可以从这个基本代码开始:

You can start from this basic code:

buf = ""

File.open('myfile.txt') do |file|
    file.readlines.each do |line|
        buf << line.gsub('my', "her")
    end
end

File.open('myfile.txt', 'w') do |file|
    file << buf
end

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