Episode #178: Identity Map

In the last episode we looked at the problem of "aliasing", here there are multiple objects representing a single row in a database. Today, we'll look at one possible solution to that problem.
Notes:

DataMapper: http://datamapper.org/
Ruby Object Mapper (ROM): http://rom-rb.org/
Perpetuity: https://github.com/jgaskins/perpetuity

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