As of 2010-02-05

Associations
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Pull associations out of attributes and refactor

Documentation
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How to get started with Rails
Using mongohq

Dynamic Attributes
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Document#[] => reads attribute
Document#[]= => writes attribute
Document#dynamic_attributes => key, value for each dynamic attribute
Document#dynamic_attribute_names => list of dynamic attribute names

Validations
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validates_hash_keys :has_hash_name, :in => [array of names]