无法从dynamo db alexa +节点lamda函数删除所有记录

Question

在dynamo数据库中，我以userid作为主键，以recid作为排序键。我想删除用户的所有记录。我正在为Alexa使用Node js lamda函数。

dbHelper.prototype.removeDetails = (userID) => {
return new Promise((resolve, reject) => {
    const scanparams = {
        TableName: tableName
    }

docClient.scan(scanparams, function(err, data) {
  if (err) 
  {
      console.error("Unable to scan item. Error JSON:", JSON.stringify(err, null, 2));
      return reject(JSON.stringify(err, null, 2))
  } // an error occurred
  else {
    data.Items.forEach(function(obj,i){
      console.log(i);
      console.log(obj);
      var params = {
        TableName: tableName,
        Key: buildKey(obj),
        ReturnValues: 'NONE', 
        ReturnConsumedCapacity: 'NONE', 
        ReturnItemCollectionMetrics: 
      };

      docClient.delete(params, function (err, data) {
          if (err) {
              console.error("Unable to delete item. Error JSON:", JSON.stringify(err, null, 2));
              return reject(JSON.stringify(err, null, 2))
          }
          console.log(JSON.stringify(err));
          console.log("DeleteItem succeeded:", JSON.stringify(data, null, 2));
          resolve()
      });
    });
  }
});        

}）； }