lazy_const
A simple way of defining lazy evaluated, const-like instances of a class.
Installation
gem 'lazy_const'
Example
Basic Usage
class Group
extend LazyConst
lazy_const :EVERYONE do
new("Everyone")
end
def initialize(name)
@name = name
@members = []
end
def add_user(user)
@members << user
end
end
class User; end
class Registrar
def new_user(name)
user = User.new(name)
Group.EVERYONE.add_user(user)
user
end
end
Testing with RSpec
spec/spec_helper.rb:
require 'lazy_const/spec'
lib/some_class.rb:
class SomeClass
extend LazyConst
lazy_const :IMPORTANT_INSTACE do
new(:hotness)
end
end
spec/some_spec.rb:
describe MyClass do
defines_const :IMPORTANT_INSTANCE
# ...
end
Contributing to lazy_const
-
Check out the latest master to make sure the feature hasn’t been implemented or the bug hasn’t been fixed yet.
-
Check out the issue tracker to make sure someone already hasn’t requested it and/or contributed it.
-
Fork the project.
-
Start a feature/bugfix branch.
-
Commit and push until you are happy with your contribution.
-
Make sure to add tests for it. This is important so I don’t break it in a future version unintentionally.
-
Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.
Copyright
Copyright © 2013 Ryan Graham. See LICENSE.txt for further details. (TL;DR: MIT license)