Add exists classmethod

[josenavas]

Changes the create and delete methods of the base class from @staticmethod to @classmethod.
It adds a new @classmethod: exists. This methods is useful to avoid inserting the same information twice in the DB. Will be needed later to avoid running the same analysis/job twice for example.

[coveralls]

Coverage increased (+0.06%) when pulling 0b50660 on josenavas:exists into 1138445 on biocore:master.

[josenavas]

Is somebody available for a fast review on this one?

[wasade]

these methods don't seem like they'd return class instances, why a class method?

[josenavas]

uhm... I will need to access to some class variables, that is why I decided to make them class methods.

For example, in the DataBase object that I'm writing right now, I'm using class variables to store some table names, and it is useful to abstract some methods. If they're classmethods, I can access the subclass variables. That makes sense? Or am I missing something?

[wasade]

ah, yes, makes sense

On Fri, May 30, 2014 at 1:01 PM, josenavas notifications@github.com wrote:

uhm... I will need to access to some class variables, that is why I
decided to make them class methods.

For example, in the DataBase object that I'm writing right now, I'm using
class variables to store some table names, and it is useful to abstract
some methods. If they're classmethods, I can access the subclass variables.
That makes sense? Or am I missing something?

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#64 (comment).

[josenavas]

Thanks!