mongoc_find_and_modify_opts_append()

Synopsis

bool
mongoc_find_and_modify_opts_append (mongoc_find_and_modify_opts_t *opts,
                                    const bson_t *extra);

Parameters

• opts: A mongoc_find_and_modify_opts_t.

• extra: A bson_t with fields and values to append directly to the findAndModify command sent to the server.

Description

Adds arbitrary options to the findAndModify command.

extra does not have to remain valid after calling this function.

extra 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.

• hint: A document or string that specifies the index to use to support the query predicate.

• let: A BSON document consisting of any number of parameter names, each followed by definitions of constants in the MQL Aggregate Expression language.

• comment: A bson_value_t specifying the comment to attach to this command. The comment will appear in log messages, profiler output, and currentOp output. Requires MongoDB 4.4 or later.

Returns

Returns true on success. If any arguments are invalid, returns false and logs an error.

Appending options to findAndModify

opts.c

void
fam_opts (mongoc_collection_t *collection)
{
   mongoc_find_and_modify_opts_t *opts;
   bson_t reply;
   bson_t *update;
   bson_error_t error;
   bson_t query = BSON_INITIALIZER;
   mongoc_write_concern_t *wc;
   bson_t extra = BSON_INITIALIZER;
   bool success;


   /* Find Zlatan Ibrahimovic, the striker */
   BSON_APPEND_UTF8 (&query, "firstname", "Zlatan");
   BSON_APPEND_UTF8 (&query, "lastname", "Ibrahimovic");
   BSON_APPEND_UTF8 (&query, "profession", "Football player");

   /* Bump his age */
   update = BCON_NEW ("$inc", "{", "age", BCON_INT32 (1), "}");

   opts = mongoc_find_and_modify_opts_new ();
   mongoc_find_and_modify_opts_set_update (opts, update);

   /* Abort if the operation takes too long. */
   mongoc_find_and_modify_opts_set_max_time_ms (opts, 100);

   /* Set write concern w: 2 */
   wc = mongoc_write_concern_new ();
   mongoc_write_concern_set_w (wc, 2);
   mongoc_write_concern_append (wc, &extra);

   /* Some future findAndModify option the driver doesn't support conveniently
    */
   BSON_APPEND_INT32 (&extra, "futureOption", 42);
   mongoc_find_and_modify_opts_append (opts, &extra);

   success = mongoc_collection_find_and_modify_with_opts (
      collection, &query, opts, &reply, &error);

   if (success) {
      char *str;

      str = bson_as_canonical_extended_json (&reply, NULL);
      printf ("%s\n", str);
      bson_free (str);
   } else {
      fprintf (
         stderr, "Got error: \"%s\" on line %d\n", error.message, __LINE__);
   }

   bson_destroy (&reply);
   bson_destroy (&extra);
   bson_destroy (update);
   bson_destroy (&query);
   mongoc_write_concern_destroy (wc);
   mongoc_find_and_modify_opts_destroy (opts);
}