Created
January 17, 2012 00:18
-
-
Save ahoward/1623766 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
class Code | |
include Mongoid::Document | |
field(:name) | |
field(:codes, :default => []) | |
validates_presence_of(:name) | |
validates_uniqueness_of(:name) | |
index(:name, :unique => true) | |
Cache = Map.new | |
class << Code | |
def for(name) | |
name = name.to_s | |
Cache[name] ||= ( | |
begin | |
create!(:name => name) | |
rescue | |
where(:name => name).first || create!(:name => name) | |
end | |
) | |
end | |
alias_method('[]', 'for') | |
end | |
def next | |
42.times do | |
code = String.random | |
query = { | |
'$and' => [ | |
{:_id => id}, | |
{'codes' => {'$nin' => [code]}} | |
] | |
} | |
update = { | |
'$addToSet' => {:codes => code} | |
} | |
if Code.collection.find_and_modify(:query => query, :update => update) | |
reload | |
return code | |
end | |
end | |
raise IndexError | |
end | |
end |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment