mongodb如何批量修改内嵌文档的属性？

数据结构如上,我需要将内嵌文档里面的isRead属性都设置成true哪要如何来批量的修改它们的值呢?直接看下面的代码:

//连接mongodb
$db = new Manager("mongodb://localhost:27017");
//设置更新语句
$bulk = new BulkWrite();
//注意这一句"['$set' => ["msg.$[].isRead" => true]]",
//我们发现 "msg.$[].isRead" $的后面有一个中括号[],中括号是这里的关键它表示更新所有匹配的属性
$bulk->update(
    ["username" => "yang", 'msg.isRead' => false],
    ['$set' => ["msg.$[].isRead" => true]],
    ['multi' => false, 'upsert' => false]
);

$writeConcern = new WriteConcern(WriteConcern::MAJORITY, 1000);
//执行更新
$result = $db->executeBulkWrite('admin.feedback_msg', $bulk, $writeConcern);
//获取被修改的记录数
echo $result->getModifiedCount();

更多操作如下:

OPERATION

Update all documents in array

 

db.coll.update({}, {$set: {“a.$[].b”: 2}})

Input: {a: [{b: 0}, {b: 1}]}

Output: {a: [{b: 2}, {b: 2}]}

 

Update all matching documents in array

 

db.coll.update({}, {$set: {“a.$[i].b”: 2}}, {arrayFilters: [{“i.b”: 0}]})

Input: {a: [{b: 0}, {b: 1}]}

Output: {a: [{b: 2}, {b: 1}]}

 

Update all matching scalars in array

 

db.coll.update({}, {$set: {“a.$[i]”: 2}}, {arrayFilters: [{i: 0}]})

Input: {a: [0, 1]}

Output: {a: [2, 1]}

 

Update all matching documents in nested array

 

db.coll.update({}, {$set: {“a.$[i].c.$[j].d”: 2}}, {arrayFilters: [{“i.b”: 0}, {“j.d”: 0}]})

Input: {a: [{b: 0, c: [{d: 0}, {d: 1}]}, {b: 1, c: [{d: 0}, {d: 1}]}]}

Output: {a: [{b: 0, c: [{d: 2}, {d: 1}]}, {b: 1, c: [{d: 0}, {d: 1}]}]}

 

Update all scalars in array matching a logical predicate

 

db.coll.update({}, {$set: {“a.$[i]”: 2}}, {arrayFilters: [{$or: [{i: 0}, {i: 3}]}]})

Input: {a: [0, 1, 3]}

Output: {a: [2, 1, 2]}

 

Each array filter must be a predicate over a document with a single field name. Each array filter must be used in the update expression, and each array filter identifier $[] must have a corresponding array filter.  must begin with a lowercase letter and not contain any special characters. There must not be two array filters with the same field name.

IMPLEMENTATION DETAILS
The implementation of this feature involved a rewrite of the update system. Users can find all the related tickets here. The design document is attached.

更多详情请查看:https://jira.mongodb.org/browse/SERVER-1243