[sqlalchemy] ActiveMapper : adding a DB column after a model change

[remi jolin]

I have defined a class like
class Image(AciveMapper):
 class mapping:
   __table__ = "image"
   id = column(Integer, primary_key=True)
   url = column(Unicode(128))
and created the DB according to the model.

I have modified the Image class to add a new column
class Image(AciveMapper):
 class mapping:
   __table__ = "image"
   id = column(Integer, primary_key=True)
   url = column(Unicode(128))
   mime_type = column(Unicode(32))

I can't find how to update the DB schema without dropping the table or 
going through SQL.
Any help ??

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