mongodb在php中合并文档

Question

I want to merge documents in mongodb with map reduce. There is key "name" is in array if same name key found in other documents it will merge in sorted order.

Example - Input Mongo dB documents have 4 rows

$data[0]['name'] = "mango";
$data[0]['price'][0]['premium'] = 10;
$data[0]['price'][1]['standard'] = 20;

$data[1]['name'] = "apple";
$data[1]['price'][0]['deluxe'] = 500;
$data[1]['price'][1]['good'] = 700;

$data[2]['name'] = "mango";
$data[2]['price'][0]['good'] = 300;

$data[3]['name'] = "apple";
$data[3]['price'][0]['premium'] = 100;
$data[3]['price'][1]['standard'] = 200;

Output after merge it will be two row

$data[0]['name'] = "mango";
$data[0]['price'][0]['premium'] = 10;
$data[0]['price'][1]['standard'] = 20;
$data[0]['price'][2]['good'] = 300;

$data[1]['name'] = "apple";
$data[1]['price'][0]['premium'] = 100;
$data[1]['price'][1]['standard'] = 200;
$data[1]['price'][2]['deluxe'] = 500;
$data[1]['price'][3]['good'] = 700;

Is this possible with mongodb?

Answer 1

像这样使用Aggregation Framework非常简单：

db.test.aggregate([{$unwind: '$price'}, {$group: {_id: '$name', price: {$push: '$price'}}}])