bool

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025         MONGOC_FIND_AND_MODIFY_OPTS_SET_UPDATE(3)

       Adds update argument to the builder.

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

       • opts: A mongoc_find_and_modify_opts_t.

       • update:   The   update   document   is   the   same   format   as   the   update   document  passed  to
         mongoc_collection_update().

       Returns true if it successfully added the option to the builder, otherwise false.

       update.c

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

             /* Find Zlatan Ibrahimovic */
             BSON_APPEND_UTF8 (&query, "firstname", "Zlatan");
             BSON_APPEND_UTF8 (&query, "lastname", "Ibrahimovic");

             /* Make him a book author */
             update = BCON_NEW ("$set", "{", "author", BCON_BOOL (true), "}");

             opts = mongoc_find_and_modify_opts_new ();
             /* Note that the document returned is the _previous_ version of the document
              * To fetch the modified new version, use
              * mongoc_find_and_modify_opts_set_flags (opts,
              * MONGOC_FIND_AND_MODIFY_RETURN_NEW);
              */
             mongoc_find_and_modify_opts_set_update (opts, update);

             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, (int) (__LINE__));
             }

             bson_destroy (&reply);
             bson_destroy (update);
             bson_destroy (&query);
             mongoc_find_and_modify_opts_destroy (opts);
          }

       Outputs:

          {
             "lastErrorObject" : {"updatedExisting" : true, "n" : 1},
                                 "value" : {
                                    "_id" : {"$oid" : "56562a99d13e6d86239c7b00"},
                                    "age" : 35,
                                    "firstname" : "Zlatan",
                                    "goals" : 342,
                                    "lastname" : "Ibrahimovic",
                                    "profession" : "Football player",
                                    "position" : "striker"
                                 },
                                           "ok" : 1
          }

          bool
          mongoc_find_and_modify_opts_set_update (mongoc_find_and_modify_opts_t *opts,
                                                  const bson_t *update);