Allow the primary key to not be named "id"

[Naddiseo]

Currently, the code makes the assumption that there is a field called "id". I have a model that looks a little like:

class MyModel(Model):
    pk = Column('id', Integer, primary_key = True)
    ...

Reason being that I don't like to override python built-ins.

[uralbash]

I want to add a new parameter 'sqlalchemy_mptt_pk_name' in sqlalchemy_mptt v0.0.6
I think this will solve your problem. For example:

class MPTTPages(BasePages, Base):
    __tablename__ = "mptt_pages"
    pk = Column('id', Integer, primary_key=True)
    sqlalchemy_mptt_pk_name = 'pk'

'id' will default

[uralbash]

see example in tests https://github.com/ITCase/sqlalchemy_mptt/blob/master/sqlalchemy_mptt/tests.py#L29