1MONGOC_FIND_AND_MODIFY_OPTS_SET_FIELlDiSbM(mO3oN)nGgOoCc_FIND_AND_MODIFY_OPTS_SET_FIELDS(3)
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4

NAME

6       mongoc_find_and_modify_opts_set_fields      -      mongoc_find_and_mod‐
7       ify_opts_set_fields()
8

SYNOPSIS

10          bool
11          mongoc_find_and_modify_opts_set_fields (mongoc_find_and_modify_opts_t *opts,
12                                                  const bson_t *fields);
13

PARAMETERS

15       · opts: A mongoc_find_and_modify_opts_t.
16
17       · fields: A subset of fields to return. Choose which fields to  include
18         by  appending {fieldname: 1} for each fieldname, or excluding it with
19         {fieldname: 0}.
20

DESCRIPTION

22       Adds fields argument to the builder.
23
24       fields does not have to remain valid after calling this function.
25

RETURNS

27       Returns true if it successfully added the option to the builder, other‐
28       wise false.
29

SETTING FIELDS

31       fields.c.INDENT 0.0
32
33          void
34          fam_fields (mongoc_collection_t *collection)
35          {
36             mongoc_find_and_modify_opts_t *opts;
37             bson_t fields = BSON_INITIALIZER;
38             bson_t *update;
39             bson_t reply;
40             bson_error_t error;
41             bson_t query = BSON_INITIALIZER;
42             bool success;
43
44
45             /* Find Zlatan Ibrahimovic */
46             BSON_APPEND_UTF8 (&query, "lastname", "Ibrahimovic");
47             BSON_APPEND_UTF8 (&query, "firstname", "Zlatan");
48
49             /* Return his goal tally */
50             BSON_APPEND_INT32 (&fields, "goals", 1);
51
52             /* Bump his goal tally */
53             update = BCON_NEW ("$inc", "{", "goals", BCON_INT32 (1), "}");
54
55             opts = mongoc_find_and_modify_opts_new ();
56             mongoc_find_and_modify_opts_set_update (opts, update);
57             mongoc_find_and_modify_opts_set_fields (opts, &fields);
58             /* Return the new tally */
59             mongoc_find_and_modify_opts_set_flags (opts,
60                                                    MONGOC_FIND_AND_MODIFY_RETURN_NEW);
61
62             success = mongoc_collection_find_and_modify_with_opts (
63                collection, &query, opts, &reply, &error);
64
65             if (success) {
66                char *str;
67
68                str = bson_as_canonical_extended_json (&reply, NULL);
69                printf ("%s\n", str);
70                bson_free (str);
71             } else {
72                fprintf (
73                   stderr, "Got error: \"%s\" on line %d\n", error.message, __LINE__);
74             }
75
76             bson_destroy (&reply);
77             bson_destroy (update);
78             bson_destroy (&fields);
79             bson_destroy (&query);
80             mongoc_find_and_modify_opts_destroy (opts);
81          }
82
83
84Outputs:
85
86          {
87             "lastErrorObject"
88                : {"updatedExisting" : true, "n" : 1},
89                  "value"
90                  : {"_id" : {"$oid" : "56562a99d13e6d86239c7b00"}, "goals" : 343},
91                    "ok" : 1
92          }
93

AUTHOR

95       MongoDB, Inc
96

98       2017-present, MongoDB, Inc
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1031.16.2                           Feb 2M5O,NG2O0C2_0FIND_AND_MODIFY_OPTS_SET_FIELDS(3)
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