# mongoc_collection_drop_with_opts()

## Synopsis

    bool
    mongoc_collection_drop_with_opts (mongoc_collection_t *collection,
                                      bson_t *opts,
                                      bson_error_t *error);

## Parameters

- `collection`: A mongoc_collection_t.

- `error`: An optional location for a bson_error_t or `NULL`.

`opts` may be NULL or a BSON document with additional command options:

- `writeConcern`: Construct a mongoc_write_concern_t and use mongoc_write_concern_append() to add the write concern to `opts`. See the example code for mongoc_client_write_command_with_opts().

- `sessionId`: First, construct a mongoc_client_session_t with mongoc_client_start_session(). You can begin a transaction with mongoc_client_session_start_transaction(), optionally with a mongoc_transaction_opt_t that overrides the options inherited from `collection`, and use mongoc_client_session_append() to add the session to `opts`. See the example code for mongoc_client_session_t.

- `collation`: Configure textual comparisons. See Setting Collation Order, and the MongoDB Manual entry on Collation. Collation requires MongoDB 3.2 or later, otherwise an error is returned.

- `serverId`: To target a specific server, include an int32 “serverId” field. Obtain the id by calling mongoc_client_select_server(), then mongoc_server_description_id() on its return value.

## Description

This function requests that a `collection` be dropped, including all indexes associated with the `collection`.

If no write concern is provided in `opts`, the collection’s write concern is used.

If the collection does not exist, the server responds with an “ns not found” error. It is safe to ignore this error; set the Error API Version to 2 and ignore server error code 26:

    mongoc_client_t *client;
    mongoc_collection_t *collection;
    bson_error_t error;
    bool r;

    client = mongoc_client_new (NULL);
    mongoc_client_set_error_api (client, 2);
    collection = mongoc_client_get_collection (client, "db", "collection");
    r = mongoc_collection_drop_with_opts (collection, NULL /* opts */, &error);
    if (r) {
       printf ("Dropped.\n");
    } else {
       printf ("Error message: %s\n", error.message);
       if (error.domain == MONGOC_ERROR_SERVER && error.code == 26) {
          printf ("Ignoring 'ns not found' error\n");
       } else {
          fprintf (stderr, "Unrecognized error!\n");
       }
    }

    mongoc_collection_destroy (collection);
    mongoc_client_destroy (client);

In MongoDB 3.0 and older, the “ns not found” error code is the generic MONGOC_ERROR_QUERY_FAILURE; in this case check whether the error message is equal to the string “ns not found”.

The `encryptedFields` document in `opts` may be used to create a collection used for Using Client-Side Field Level Encryption. If `encryptedFields` is specified, the “ns not found” error is not returned.

## Errors

Errors are propagated via the `error` parameter.

## Returns

Returns true if the collection was successfully dropped. Returns `false` and sets `error` if there are invalid arguments or a server or network error.