Reduce duplication in models

[scottohara]

All models currently extend from a Base model.

The base model holds a reference to the db (from ApplicationController) used for all database operations, but that's all it does.

There are a lot of similar methods/functionality in models, and it would be ideal if we could rationalise any duplication and move it higher up in the hierarchy for reuse; and define the minimum interface that models performing a specific role are required to implement (e.g. all entities need the methods find, save, remove,fromJson,torsion` etc.)

The table below lists the common methods for each model:

Model	List	Find	Count	Remove All	From JSON	Save	Remove	To JSON
Episode	listBySeries listByUnscheduled (list)	find	totalCount countByStatus (count)	removeAll	fromJson	save	remove	toJson
Program	list	find	count	removeAll	fromJson	save	remove	toJson
Series	listByProgram listByNowShowing listByStatus lisByIncomplete (list)	find	count	removeAll	fromJson	save	remove	toJson
Setting		get				save	remove
Sync	list		count	removeAll			remove

In addition, both the Program & Series models have a number of similar setXXXCount() methods that update the progress bar display, which may be able to refactored to reduce duplicate code.

[scottohara]

With the move an actual API (Sinatra/Couch -> Rails/Postgres), the above table may now be outdated as the models have significantly changed.