使用gsub用换行符替换特定字符（Ruby，Rails控制台）
[英]Using gsub to replace a particular character with a newline (Ruby, Rails console)
问题描述
Annoying problem. 
烦人的问题。 I am trying to replace all semicolon characters in my Model's description field with newline characters (\\n). 我试图用换行符（\\ n）替换模型描述字段中的所有分号字符。 The database is sqlite. 该数据库是sqlite。 The field is of type text. 该字段是文本类型。
If I do it manually at the rails console (manually typing the description for a single record using \\n for line breaks), the rails console automatically escapes the \\n, and the description field becomes filled with \\\\n . 如果我在rails控制台上手动执行此操作（使用\\ n手动输入单个记录的描述来换行），rails控制台会自动转义\\ n，并且描述字段将变为\\\\n 。
If I do it programmatically using gsub, I get the following situation: 如果使用gsub以编程方式进行操作，则会出现以下情况：
>> s = Sample.find(:first)
=> ...details of record ... => ...详细记录...
>> s.description.gsub!(/;/,"\n")
=> ...success - it all looks good, new lines in the returned value are represented by \\n... => ...成功-一切看起来不错，返回值中的新行用\\ n表示。
>> s.save
=> true
>> reload!
Reloading
=> true
>> s = Sample.find(:first)
=> ...details of record ... => ...详细记录...
>> s.description
=> ... the description field still has semicolons in it rather than newline characters ... => ... description字段中仍带有分号而不是换行符...
AHHHHHH!!!!!!! AHHHHHH !!!!!!!
2 个解决方案
解决方案1
28 已采纳 2009-10-10 11:23:02
s.description returns a copy of the description so gsub! s.description返回描述的副本，所以gsub! will only modify the copy and return the modified copy. 只会修改副本并返回修改后的副本。
Try this: 尝试这个：
s.description = s.description.gsub(/;/,"\n")
解决方案2
0 2009-10-11 06:58:13
如果您要大量编辑ActiveRecord字段，则可以使用rails插件console_update在编辑器中对其进行编辑
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