A batch operation performs several API calls in a single call.

📘
Batch API Calls Count
When performing a batch operation, the actual number of API calls is the number of calls inside the batch operation. For example, if a batch operation updates 5 objects, it will count as 5 platform API calls.

To execute a batch operation send the following request:

curl -X POST \\
-H "Content-Type: application/json" \\
-H "X-Appery-Database-Id: <database_id>" \\
[-H "X-Appery-Session-Token: <session_token>" \\]
-d "<operations_array>" \\
https://api.appery.io/rest/1/db/batch

operations_array is a JSON array of objects containing batch operations description. For example:

[
    {
        "method": "<method>",
        "collection": "<collection_name>",
        "_id": "<object_id>",
        "data": `<object_data>`
    },
    {
        "method": "<method>",
        "collection": "<collection_name>",
        "_id": "<object_id>",
        "data": `<object_data>`
    },
    ...
]

Parameer	Description	Required
method	GET, POST, PUT or DELETE.	Yes.
collection_name	Database collection name.	Yes
object_id	Object ID to perform the operation on.	Required for GET, PUT or DELETE.
object_data	Object data for the operation.	Required for POST or PUT.

The database returns HTTP 200 OK status and JSON array representing results for the operations requested.

If an operation fails on a specific object, operations on other objects will continue.

The position of the operation result item is the same as the position of the operation description in the request. For example:

[
    {
        "<operation_status>": `<operation_result>`
    },
    {
        "<operation_status>": `<operation_result>`
    },
    ...
]


<HTMLBlock>{`
<table style="width: 100%; border-collapse: collapse;">
<thead>
<tr>
  <th style="border: 1px solid #ddd; padding: 8px;">Parameter</th>
  <th style="border: 1px solid #ddd; padding: 8px;">Description</th>
</tr>
</thead>
<tbody>
<tr>
  <td style="border: 1px solid #ddd; padding: 8px;"><p>operation_status</p>
</td>
  <td style="border: 1px solid #ddd; padding: 8px;"><p>success or error.</p>
</td>
</tr>
<tr>
  <td style="border: 1px solid #ddd; padding: 8px;"><p>operation_result</p>
</td>
  <td style="border: 1px solid #ddd; padding: 8px;"><p>JSON object representing operation response which is usually returned by a direct service invocation (see Collections REST API for more details), including error responses.</p>
</td>
</tr>
</tbody>
</table>
`}</HTMLBlock>

## Example


For collection **Labels** with one custom column name (string): 


<Image
  align="#e7e7e7"
  alt="labels1.png"
  border={false}
  caption="Sample collection."
  src="https://files.readme.io/a33b1c0-labels1.png"
  width="654"
/>


Batch operation has the following format: 


```curl
curl -X POST \\
-H "Content-Type: application/json" \\
-H "X-Appery-Database-Id: 58a59358975a4fa00e0ff50f" \\
https://api.appery.io/rest/1/db/batch
-d 
  "[
    {
        "method": "post",
        "collection": "Labels",
        "data": {"name": "nick"}
    },
    {
        "method": "put",
        "collection": "Labels",
        "_id": "58a59386975a4fa00e0ff513",
        "data": {"name": "max updated"}
    },
    {
        "method": "delete",
        "collection": "Labels",
        "_id": "58a59381975a4fa00e0ff512"
    },
    {
        "method": "get",
        "collection": "Labels",
        "_id": "58a59386975a4fa00e0ff513"
    }, 
    {
        "method": "put",
        "collection": "Labels",
        "_id": "000000000000000000000000",
        "data": {"name": "unexisting label with _id 000000000000000000000000"}
    }
]"

[
  {
    "success": {
      "_id": "58a5962d0a975a799b278abd",
      "_createdAt": "2017-02-16 12:08:13.327"
    }
  },
  {
    "success": {
      "_updatedAt": "2017-02-16 12:08:13.337"
    }
  },
  {
    "success": {}
  },
  {
    "success": {
      "_id": "58a59386975a4fa00e0ff513",
      "name": "max updated",
      "_createdAt": "2017-02-16 11:56:54.725",
      "_updatedAt": "2017-02-16 12:08:13.337"
    }
  },
  {
    "error": {
      "code": "DBSU205",
      "description": "Collection 'Labels' doesn't contain object with id 000000000000000000000000."
    }
  }
]