NAME

       mongoc_find_and_modify_opts_set_fields() - Adds fields argument to the builder.

SYNOPSIS

       bool
       mongoc_find_and_modify_opts_set_fields (mongoc_find_and_modify_opts_t  *opts,
                                               const bson_t                   *fields);

       NOTE
              New in mongoc 1.3.0

PARAMETERS

       opts   A mongoc_find_and_modify_opts_t \&.

       fields A  subset  of  fields  to  return.  Choose  which  fields  to  include by appending
              {fieldname: 1} for each fieldname, or excluding it with {fieldname: 0} \&.

DESCRIPTION

       Adds fields argument to the builder.

RETURNS

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

SETTING FIELDS

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

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

          /* Return his goal tally */
          BSON_APPEND_INT32 (&fields, "goals", 1);

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

          opts = mongoc_find_and_modify_opts_new ();
          mongoc_find_and_modify_opts_set_update (opts, update);
          mongoc_find_and_modify_opts_set_fields (opts, &fields);
          /* Return the new tally */
          mongoc_find_and_modify_opts_set_flags (opts, MONGOC_FIND_AND_MODIFY_RETURN_NEW);

          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 (&fields);
          bson_destroy (&query);
          mongoc_find_and_modify_opts_destroy (opts);
       }

       Outputs:

       {
           "lastErrorObject": {
               "updatedExisting": true,
               "n": 1
           },
           "value": {
               "_id": {
                   "$oid": "56562a99d13e6d86239c7b00"
               },
               "goals": 343
           },
           "ok": 1
       }

COLOPHON

       This   page   is   part   of   MongoDB   C   Driver.    Please   report   any   bugs    at
       https://jira.mongodb.org/browse/CDRIVER.