DataSource for CouchDB

I'm new to CakePHP (and also PHP) and I've started a project that uses it. I'd like to implement a DataSource to use with CouchDB and I'm wondering if there is some source of information to do so, other than this one: http://book.cakephp.org/2.0/en/models/datasources.html. There, I can find an example that gives me some hints in how I should implement my DataSource, but I'm missing details in what I should expect to receive in the parameters of the functions I must implement, what I must return and what to do in case of exceptions. 

Thank you

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