Using gsub to replace a particular character with a newline (Ruby, Rails console)

Question

Annoying problem. I am trying to replace all semicolon characters in my Model's description field with newline characters (\\n). The database is sqlite. The field is of type text.

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 .

If I do it programmatically using gsub, I get the following situation:

>> s = Sample.find(:first)

=> ...details of record ...

>> s.description.gsub!(/;/,"\n")

=> ...success - it all looks good, new lines in the returned value are represented by \\n...

>> s.save

=> true

>> reload!

Reloading

=> true

>> s = Sample.find(:first)

=> ...details of record ...

>> s.description

=> ... the description field still has semicolons in it rather than newline characters ...

AHHHHHH!!!!!!!

Answer 1

s.description returns a copy of the description so gsub! will only modify the copy and return the modified copy.

Try this:

s.description = s.description.gsub(/;/,"\n")

Answer 2

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