bool
mongoc_find_and_modify_opts_set_update (mongoc_find_and_modify_opts_t *opts,


                                        const bson_t *update);

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, __LINE__);


   }


   bson_destroy (&reply);


   bson_destroy (update);


   bson_destroy (&query);


   mongoc_find_and_modify_opts_destroy (opts);
}

{


   "lastErrorObject" : {"updatedExisting" : true, "n" : 1},


                       "value" : {


                          "_id" : {"$oid" : "56562a99d13e6d86239c7b00"},


                          "age" : 35,


                          "firstname" : "Zlatan",


                          "goals" : 342,


                          "lastname" : "Ibrahimovic",


                          "profession" : "Football player",


                          "position" : "striker"


                       },


                                 "ok" : 1
}