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// Copyright 2009-present MongoDB, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <iostream>
#include <bsoncxx/builder/basic/document.hpp>
#include <bsoncxx/builder/basic/kvp.hpp>
#include <bsoncxx/builder/basic/sub_array.hpp>
#include <bsoncxx/json.hpp>
#include <mongocxx/client.hpp>
#include <mongocxx/collection.hpp>
#include <mongocxx/database.hpp>
#include <mongocxx/instance.hpp>
#include <mongocxx/uri.hpp>
#include <examples/macros.hh>
// NOTE: Any time this file is modified, a WEBSITE ticket should be opened to sync the changes with
// the "What is MongoDB" webpage, which the example was originally added to as part of WEBSITE-5148.
int EXAMPLES_CDECL main() {
// 1. Connect to MongoDB instance running on localhost
mongocxx::instance instance{};
mongocxx::client client{mongocxx::uri{}};
mongocxx::database db = client["test"];
mongocxx::collection coll = db["restaurants"];
// 2. Insert
using bsoncxx::builder::basic::kvp;
bsoncxx::builder::basic::document doc1;
doc1.append(
kvp("name", "Sun Bakery Trattoria"),
kvp("stars", 4),
kvp("categories", [](bsoncxx::builder::basic::sub_array arr) {
arr.append("Pizza", "Pasta", "Italian", "Coffee", "Sandwiches");
}));
bsoncxx::builder::basic::document doc2;
doc2.append(
kvp("name", "Blue Bagels Grill"),
kvp("stars", 3),
kvp("categories",
[](bsoncxx::builder::basic::sub_array arr) { arr.append("Bagels", "Cookies", "Sandwiches"); }));
bsoncxx::builder::basic::document doc3;
doc3.append(
kvp("name", "Hot Bakery Cafe"), kvp("stars", 4), kvp("categories", [](bsoncxx::builder::basic::sub_array arr) {
arr.append("Bakery", "Cafe", "Coffee", "Dessert");
}));
bsoncxx::builder::basic::document doc4;
doc4.append(
kvp("name", "XYZ Coffee Bar"), kvp("stars", 5), kvp("categories", [](bsoncxx::builder::basic::sub_array arr) {
arr.append("Bakery", "Coffee", "Cafe", "Bakery", "Chocolates");
}));
bsoncxx::builder::basic::document doc5;
doc5.append(
kvp("name", "456 Cookies Shop"), kvp("stars", 4), kvp("categories", [](bsoncxx::builder::basic::sub_array arr) {
arr.append("Bakery", "Cookies", "Cake", "Coffee");
}));
std::vector<bsoncxx::document::value> documents = {
doc1.extract(), doc2.extract(), doc3.extract(), doc4.extract(), doc5.extract()};
auto result = coll.insert_many(documents);
// 3. Query
for (auto&& doc : coll.find({})) {
std::cout << bsoncxx::to_json(doc) << std::endl;
}
// 4. Create Index
bsoncxx::builder::basic::document index_specification;
index_specification.append(kvp("name", 1));
coll.create_index(index_specification.extract());
// 5. Perform aggregation
mongocxx::pipeline stages;
bsoncxx::builder::basic::document match_stage;
bsoncxx::builder::basic::document group_stage;
using bsoncxx::builder::basic::sub_document;
match_stage.append(kvp("categories", "Bakery"));
group_stage.append(kvp("_id", "$stars"), kvp("count", [](sub_document sub) { sub.append(kvp("$sum", 1)); }));
stages.match(match_stage.view()).group(group_stage.view());
for (auto&& doc : coll.aggregate(stages)) {
std::cout << bsoncxx::to_json(doc) << std::endl;
}
}
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