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# \$1pullAll
<a name="pullAll"></a>

Amazon DocumentDB 中的`$pullAll`运算符用于从数组字段中删除指定值的所有实例。当你需要在一次操作中从数组中移除多个元素时，这特别有用。

**参数**
+ `field`：要从中移除元素的数组字段的名称。
+ `value`：要从数组字段中移除的值数组。

## 示例（MongoDB 外壳）
<a name="pullAll-examples"></a>

以下示例演示如何使用`$pullAll`运算符从数组字段中移除多个元素。

**创建示例文档**

```
db.restaurants.insert([
  {
    "name": "Taj Mahal",
    "cuisine": "Indian",
    "features": ["Private Dining", "Live Music"]
  },
  {
    "name": "Golden Palace",
    "cuisine": "Chinese",
    "features": ["Private Dining", "Takeout"]
  },
  {
    "name": "Olive Garden",
    "cuisine": "Italian",
    "features": ["Private Dining", "Outdoor Seating"]
  }
])
```

**查询示例**

```
db.restaurants.update(
  { "name": "Taj Mahal" },
  { $pullAll: { "features": ["Private Dining", "Live Music"] } }
)
```

**输出**

```
{
  "name": "Taj Mahal",
  "cuisine": "Indian",
  "features": []
}
```

## 代码示例
<a name="pullAll-code"></a>

要查看使用该`$pullAll`命令的代码示例，请选择要使用的语言的选项卡：

------
#### [ Node.js ]

```
const { MongoClient } = require('mongodb');

async function main() {
  const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
  const db = client.db('test');
  const collection = db.collection('restaurants');

  await collection.updateMany(
    { "name": "Taj Mahal" },
    { $pullAll: { "features": ["Private Dining", "Live Music"] } }
  );

  const updatedDocument = await collection.findOne({ "name": "Taj Mahal" });
  console.log(updatedDocument);

  await client.close();
}

main();
```

------
#### [ Python ]

```
from pymongo import MongoClient

def main():
    client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
    db = client['test']
    collection = db['restaurants']

    collection.update_many(
        {"name": "Taj Mahal"},
        {"$pullAll": {"features": ["Private Dining", "Live Music"]}}
    )

    updated_document = collection.find_one({"name": "Taj Mahal"})
    print(updated_document)

    client.close()

if __name__ == '__main__':
    main()
```

------