<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def generate_key(self):
 """ Generate cache key for the current query. If a new key is created for the model it is then shared with other consumers. """

        sql = self.sql()
        key, created = self.get_or_create_model_key()
        if created:
            db_table = self.model._meta.db_table
            logger.debug('created new key {0} for model {1}'.format(key, db_table))
            model_cache_info = ModelCacheInfo(db_table, key)
            model_cache_backend.share_model_cache_info(model_cache_info)
        query_key = u'{model_key}{qs}{db}'.format(model_key=key,
                                                  qs=sql,
                                                  db=self.db)
        key = hashlib.md5(query_key.encode('utf-8')).hexdigest()
        return key