mongoc_find_and_modify_opts_set_update()¶

Synopsis¶

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

Parameters¶

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().

Description¶

Adds update argument to the builder.

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

Returns¶

Returns true if it successfully added the option to the builder.

Setting update¶

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_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);
}

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
}