# Bulk Assign Books

Add multiple books to a collection at once.

**Endpoint**: `POST /api/collections/{id}/books`
**Auth**: Required
**Content-Type**: `application/json`

## Path Parameters

| Parameter | Type | Required | Description |
|-----------|------|-----------|-------------|
| id | string (UUID) | Yes | Collection UUID |

## Request Body

| Field | Type | Required | Description |
|--------|------|-----------|-------------|
| book_ids | array of UUID | Yes | Array of book IDs to add |

### Example Request

```json
{
  "book_ids": [
    "660e8400-e29b-41d4-a716-446655440000",
    "770e8400-e29b-41d4-a716-446655440000",
    "880e8400-e29b-41d4-a716-446655440000"
  ]
}
```

## Response (204 No Content)

Books added to collection successfully. No response body.

## Notes

- Books already in the collection are ignored
- This is more efficient than adding books individually
- Maximum 1000 books per request

## Error Responses

| Code | Description |
|------|-------------|
| 400 | Invalid request (validation failed) |
| 401 | Authentication required |
| 404 | Collection or book(s) not found |
| 500 | Internal server error |

## Try It Out
