18 Jun '13, 2pm

Ruby, Rails, MongoDB and the Object-Relational Mismatch

The Active Record pattern describes the mapping of an object instance to a row in a relational database table, using accessor methods to retrieve columns/properties, and the ability to create, update, read, and delete entities from the database. It was first named by Martin Fowler in his book, Patterns of Enterprise Application Architecture. The pattern has numerous limitations referred to as the Object-relational impedance mismatch. Some of these technical difficulties are structural. In OO programming, objects may be composed of other objects. The Active Record pattern maps these sub-objects to separate tables, thus introducing issues concerning the representation of relationships and encapsulated data. Rails’ biggest contribution to web programming was arguably not the framework itself, but rather its Object-relational-mapper, Active Record. Active Record uses macros to...

Full article: http://blog.mongodb.org/post/53271876885/ruby-rails-mongo...

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