[Nitro] Og and legacy tables

[Robert Mela]

I love Og because I can sketch out my ideas in the most intuitive way -- 
as objects, very concise ones at taht -- and the database tedium, 
including table creation, join tables, etc., is taken care of for me.

But often it's necessary to work with pre-existing tables from another 
application, and in those cases, ActiveRecord adapts pretty well -- you 
can specify join table names ( e.g., :through ), override default table 
names and unique id field names, etc.

I haven't seen anything in Og that looks like it creates classes based 
on an existing table schema.    Would anyone be interested in seeing Og 
be able to wrap an existing table the way ActiveRecord can?  It'd 
involve adding attributes to override Og's default table naming, allow 
arbitrary naming of the id field, and ways to specify join tables and 
foreign key names of related objects.

It might also allow Nitro to leverage ActiveRecord::Migration for 
managing database upgrades and rollbacks.

(Of course, it's possible these features are already possible with Og 
and this is simply an exercise in public humility, but there's value in 
that too...
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