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candland/Rakefile

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Last active June 23, 2021 15:57
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explanation.md

If you have rake tasks that don't rely on rails, it's really annoying that rails has to load before the tasks runs.

Instead this rakefile only loads rails if a rake task which depends on :environment is called.

  • Added a call to Rake::Application#clear before loading the rails environment so that tasks are not called twice, and so that tasks can be called again.

One caveat is that rake -T won't list rails/gem tasks, hence the added warning. To show all tasks use rake -T LOAD_RAILS=1

With thanks to @xshay http://rhnh.net/2010/09/07/speeding-up-rails-rake

Any thoughts?

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Rakefile
#!/usr/bin/env rake
# Add your own tasks in files placed in lib/tasks ending in .rake,
# for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
#The original rails rakefile loading
def load_rails_environment
require File.expand_path('../config/application', __FILE__)
require 'rake'
MyApp::Application.load_tasks
end
#Catch task missing and try again
class Rake::Application
private
alias_method :invoke_task_without_catch, :invoke_task
def invoke_task_with_catch(*args)
begin
puts "Trying #{task_string}"
invoke_task_without_catch(*args)
rescue RuntimeError => e
if m = /task '([^']*)'/i.match(e.message)
puts "Loading Rails for: #{m[1]}"
self.clear()
load_rails_environment
invoke_task_without_catch(task_string)
end
end
end
alias_method :invoke_task, :invoke_task_with_catch
end
#Add a task to the top of the rake -T list, to explain how to get the full list
#of tasks including rails and gem tasks
if ENV['LOAD_RAILS'] == '1'
load_rails_environment
else
#Load all the tasks in lib/tasks
Dir[File.expand_path('../lib/tasks/', __FILE__) + '/*.rake'].each do |file|
load file
end
desc "!!! Rails and gem tasks are not listed, rerun with LOAD_RAILS=1 to reveal"
task :_README
end
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