utils.py 文件源码

def get_field(self, model):
        '''
        Return the django model field for model in context, following relations.
        '''
        if not hasattr(model, '_meta'):
            return

        field = None
        for bit in self.bits:
            try:
                field = model._meta.get_field(bit)
            except FieldDoesNotExist:
                break

            if hasattr(field, 'remote_field'):
                rel = getattr(field, 'remote_field', None)
                model = getattr(rel, 'model', model)

            # !!! Support only for Django <= 1.8
            # Remove this when support for Django 1.8 is over
            else:
                rel = getattr(field, 'rel', None)
                model = getattr(rel, 'to', model)

        return field