# Check if the data source has been added

Checks whether the requested catalog file and table already exist in the knowledge base as a data source. Use this interface to remove duplicates before adding sources.

```text
POST https://moi.matrixorigin.cn/newmoi/semantic-models/{model_id}/sources/existence
```

## Preparation before calling

First confirm the identification of the files and tables to be checked in the Catalog. Prepare a personal access token and target workspace ID that has access to the target workspace.

The example below uses:

- `$AI_STUDIO_API_KEY`: The actual personal access token, passed through the `X-API-Key` Header.
- `$WORKSPACE_ID`: Target workspace ID, passed through `X-Workspace-ID` Header.
- `$MODEL_ID`: The knowledge base ID to check.
- `$FILE_ID`: Catalog file ID to check.
- `$TABLE_ID`: Catalog table ID to check.

## Request example

```bash
curl -X POST "https://moi.matrixorigin.cn/newmoi/semantic-models/$MODEL_ID/sources/existence" \
  -H "X-API-Key: $AI_STUDIO_API_KEY" \
  -H "X-Workspace-ID: $WORKSPACE_ID" \
  -H 'Content-Type: application/json' \
  -d '{
    "file_ids": ["'"$FILE_ID"'"],
    "table_ids": ['"$TABLE_ID"']
  }'
```

## Path parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `model_id` | integer | Yes | The knowledge base ID of the data source to be checked. |

## Request body

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `file_ids` | array[string] | No | The file ID to check. |
| `table_ids` | array[integer] | No | The table ID to check. |

## Successful response

Returns `200` on success, and only returns request IDs that already exist in the knowledge base. Remove these duplicates from the to-be-added list before adding the source.

```json
{
  "code": "OK",
  "msg": "OK",
  "data": {
    "file_ids": ["file_01"],
    "table_ids": [456]
  }
}
```

The response fields are as follows.

| Field | Type | Description |
| --- | --- | --- |
| `code` | string | `OK` on success. |
| `msg` | string | `OK` on success. |
| `data.file_ids` | string[] | Among the requested file IDs, the ID already exists as the source. |
| `data.table_ids` | integer[] | The ID of the requested table ID that already exists as a source. |

`[]` after a type means an array. For example, `string[]` is an array of strings.

## Error response

```json
{
  "code": "ErrParamInvalid",
  "msg": "invalid source identifiers",
  "data": null
}
```

### Common HTTP errors

```{list-table}
:header-rows: 1
:widths: 12 22 32 34

* - HTTP status code
  - error code
  - Common causes
  - Recommended actions
* - `400`
  - `ErrParamInvalid`
  - Invalid `model_id`, file ID, or table ID.
  - Correct the request parameters and try again.
* - `401`
  - `ErrUnauthorized`
  - The API Key is invalid or has expired.
  - Check API Key.
* - `403`
  - `ErrForbidden`
  - The caller does not have permission to read the source or knowledge base.
  - Check workspace and object authorization.
* - `404`
  - `ErrNotFound`
  - The knowledge base does not exist or is not visible.
  - Reconfirm `model_id`.
* - `500`
  - `ErrServer`
  - The service failed to check the source.
  - Keep the desensitized response information and try again.
```

## Follow-up operations

[Add data source](add-data-sources.md) after removing duplicates.