daleharvey/pouchdb — pull request #709 by neojski (2013-04-20 14:29:16+00:00)
Title: (#683) - _getAttachments called in generic adapter

This work moves getting attachments entirely to generic adapter leaving
_get of each adapter really simple and doing (almost) minimal work.

Reintroducted idea of txn in opts called now ctx. Usage here:

each adapter returns some ctx that is then passed to _getAttachment.
Using this we can ask about attachments in the same transaction as
get. This should be also used to ask about open_revs in the same
transaction.

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I'm not yet sure how far should I continue this work of abstracting logic into generic adapter. If sth like:
_getMetadata and then _getDocument is ok? (and implement all logic in generic adapter)
I'm not sure if we can do the same with bulkDocs.