'De-serialize from Mongo-storable format to an object.'

def from_storable(self, block_data):

    self.fields = block_data.get('fields', {})
    self.block_type = block_data.get('block_type', None)
    self.definition = block_data.get('definition', None)
    self.defaults = block_data.get('defaults', {})
    self.asides = block_data.get('asides', {})
    self.edit_info = EditInfo(**block_data.get('edit_info', {}))
