Fixing Rails nested attributes on collections with sti

user.persons.build(:type=>’Manager’).class != Manager, which makes a lot of problems with single table inheritance, especially when dealing with accepts_nested_attributes_for / fields_for that rely on correct class of the associated.

# Make build associations have their given type
# Makes that: user.persons.build(:type=>Manager).class == Manger
class ActiveRecord::Reflection::AssociationReflection
  def build_association(*options)
    if options.first.is_a?(Hash) and options.first[:type].presence
      options.first[:type].to_s.constantize.new(*options)
    else
      klass.new(*options)
    end
  end
end

rails issue

one-liner to install nginx with passenger and ssl

Just build this little guy for our puppet script, maybe someone needs it too 🙂
export V=0.7.67 && wget -O /tmp/nginx-$V.tar.gz http://sysoev.ru/nginx/nginx-$V.tar.gz && cd /tmp && tar xzvf nginx-$V.tar.gz && sudo passenger-install-nginx-module --nginx-source-dir /tmp/nginx-$V --extra-configure-flags="--with-http_ssl_module" --auto --prefix=/opt/nginx-$V && rm /opt/nginx && sudo ln -s /opt/nginx-$V /opt/nginx

(If you like the stock nginx without ssl, youll need the –auto-download option)

ActiveRecord update_one

A simple and readable alternative to update_all({:x=>y}, :id=>id)

Usage

User.update_one(id, :name=>'Pete')

Code

clas ActiveRecord::Base
  def self.update_one(id, attributes)
    update_all(attributes, :id => id)
  end
end

Adding chainable scopes and named scopes to MongoMapper

With Scopify chainable scopes and named scopes can be added to any model, for example MongoMapper:

MongoMapper::Document::ClassMethods.send(:include, Scopify::ClassMethods)
MongoMapper::Plugins::Associations::Proxy.send(:include, Scopify::ClassMethods)

It adds basic scoping and with some love from the Mongo community, it will soon be able to also merge multiple conditions / order`s.

IRB History and colors with Wirble

For a nicer irb experience there is wirble, a gem that adds history and colorization, the only thing missing so far was actual support and bugfixes, which i finally found on blackwinters branch, now history scrolling is fun again 🙂

A small excerpt from my dotfiles irbrc

def require_without_bundler(gem, file)
  return require(file) unless defined?(::Bundler)
  if gem_path = Dir.glob("{#{Gem.path.join(',')}}/gems/#{gem}*").first
    $LOAD_PATH << "#{gem_path}/lib"
    require file
  else
    raise LoadError, "Gem #{gem} not found via require_without_bundler"
  end
end

begin
  # nice history and color
  require_without_bundler 'blackwinter-wirble', 'wirble' # blackwinter branch has history_uniq fixes
  Wirble::History::DEFAULTS[:history_uniq] = 'reverse'

  Wirble.init
  Wirble.colorize
rescue LoadError
  # No wirble use defaults to get at least history
  require 'irb/ext/save-history'
  IRB.conf[:USE_READLINE] = true
  IRB.conf[:SAVE_HISTORY] = 10000
  IRB.conf[:HISTORY_FILE] = "#{ENV['HOME']}/.irb-save-history"
end

Michael Grosser, the Blog

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Category Archives: Ruby