Wrapper around sqlalchemy model for having some easier functions
Returns the primary keys
Inspired by flask-restless.helpers.primary_key_names
Returns the primary keys
Inspired by flask-restless.helpers.primary_key_names
Returns the foreign keys
Inspired by flask-restless.helpers.primary_key_names
Returns the proxies objects of the model
Inspired by https://groups.google.com/forum/?fromgroups=#!topic/sqlalchemy/aDi_M4iH7d0