Rake Tutorial

[url]http://www.railsenvy.com/2007/6/11/ruby-on-rails-rake-tutorial[/url]

Rake来自Make

Make将编译过而且没改动过的源文件与改动过的源文件区分开来，做增量build

Rake不管编译这茬事

Rake使用Ruby语言

Rails里的rake任务放在lib/tasks目录

例子:lib/tasks/something.rake
[code]
namespace :utils do
desc "Create blank directories if they don't already exist"
task(:create_direcotries) do

# The folders I need to craete
shared_folders = ["icons", "images", "groups"]

for folder in shared_folders

# Check to see if it exists
if File.exists?("#{RAILS_ROOT} /public/#{folder}")
puts "#{RAILS_ROOT}/public/#{folder} exists"
else
puts "#{RAILS_ROOT}/public/#{folder} doesn't exist so we're creating"
Dir.mkdir "#{RAILS_ROOT}/public/#{folder}"
end

end

end
end
[/code]

rake --task可以看到当前可以使用的rake任务

:environment任务让我们可以使用Rails Models
[code]
namespace :utils do
desc "Finds soon to expire subscriptions and emails users"
task(:send_expire_soon_emails => :environment) do
# Find users to email
for user in User.members_soon_to_expire
puts "Emailing #{user.name}"
UserNotifier.deliver_expire_soon_notification(user)
end
end
end
[/code]