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Hashie is a growing collection of tools that extend Hashes and make them more useful.


Hashie is available as a RubyGem:

gem install hashie


Mash is an extended Hash that gives simple pseudo-object functionality that can be built from hashes and easily extended. It is designed to be used in RESTful API libraries to provide easy object-like access to JSON and XML parsed hashes.


mash = # => false # => nil = "My Mash" # => "My Mash" # => true
mash.inspect # => <Hashie::Mash name="My Mash">

mash =
# use bang methods for multi-level assignment!.name = "Michael Bleigh" # => <Hashie::Mash name="Michael Bleigh">

Note: The ? method will return false if a key has been set to false or nil. In order to check if a key has been set at all, use the mash.key?('some_key') method instead.


Dash is an extended Hash that has a discrete set of defined properties and only those properties may be set on the hash. Additionally, you can set defaults for each property.


class Person < Hashie::Dash
  property :name
  property :email
  property :occupation, :default => 'Rubyist'

p = # => nil = ''
p.occupation   # => 'Rubyist'        # => ''
p[:awesome]    # => NoMethodError
p[:occupation] # => 'Rubyist'

p = => "Bob")       # => 'Bob'
p.occupation # => 'Rubyist'


A Trash is a Dash that allows you to translate keys on initialization. It is used like so:

class Person < Hashie::Trash
  property :first_name, :from => :firstName

This will automatically translate the firstName key to first_name when it is initialized using a hash such as through: => 'Bob')


Clash is a Chainable Lazy Hash that allows you to easily construct complex hashes using method notation chaining. This will allow you to use a more action-oriented approach to building options hashes.

Essentially, a Clash is a generalized way to provide much of the same kind of “chainability” that libraries like Arel or Rails 2.x's named_scopes provide.


c =
c.where(:abc => 'def').order(:created_at)
c # => {:where => {:abc => 'def}, :order => :created_at}

# You can also use bang notation to chain into sub-hashes,
# jumping back up the chain with _end!
c =
c # => {:where => {:abc => 'def', :ghi => 123}, :order => :created_at}

# Multiple hashes are merged automatically
c =
c.where(:abc => 'def').where(:hgi => 123)
c # => {:where => {:abc => 'def', :hgi => 123}}

Note on Patches/Pull Requests

  • Fork the project.

  • Make your feature addition or bug fix.

  • Add tests for it. This is important so I don't break it in a future version unintentionally.

  • Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)

  • Send me a pull request. Bonus points for topic branches.


  • Michael Bleigh


Copyright © 2009 Intridea, Inc ( See LICENSE for details.

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