I am writing a Ruby script for use in the Rails environment, but I chose to run it from irb because reloading the Rails console can be a pain. Now the wait time is much shorter from irb, but I'm bothered that I have to restart irb and require the script everytime I make a change. Is there a simpler way of reloading a script from irb?
I found a method in this thread, but that only applies to gem files apparently. My require statement looks like this
require "#{File.expand_path(__FILE__)}/../lib/query"
EDIT: Having tried load rather than require, I still couldn't get it to work. I can't get a stop on these errors.
ruby-1.9.2-p0 > load "#{File.expand_path(__FILE__)}/../lib/query.rb"
LoadError: no such file to load -- /Users/newuser/Dropbox/Sites/rails/hacknyc/(irb)/../lib/query.rb
In irb, File.expand_path(__FILE__)} will just return "#{path you ran irb from}/(irb)". Which creates a path that doesn't actually exist. Luckily all file paths are relative to where you ran irb anyway. This means all you need is:
load "lib/query.rb"
If you want to use the __FILE__ in an actual file, that's fine, but don't expect it to produce a valid path in irb. Because an irb there is no "file" at all, so it cannot return valid path at all.
Also, __FILE__ will work fine if used in a file loaded into irb via load or require. Cause that's kinda what it's for.
Instead of using require, try load. The former only loads a source file once, while the latter loads it every time you call it.
according to this link you need to load your file and do not forget the extention.
Here is a fancier version to use too at this link number 2 which could be helpful for you too.
You may want to try hashing out why your rails console isn't working for you though.
I think load is what you are looking for.
来源：https://stackoverflow.com/questions/4632090/how-can-i-reload-a-script-in-irb